contacta V34a PRO Hearing Loop Driver User Guide

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contacta logo1V22a / V34 / V34a
Hearing Loop Driver

contacta V34a PRO Hearing Loop DriverInstallation& User Guide

Contacte has a policy of continuous product development, therefore small specification changes may not be reflected in this manual. Images, labels, packaging, accessories and product colours are subject to change without notice.

Product Overview

Our highly efficient and slimline V Series PRO range of hearing loop drivers (V22a, V34, and V34a) are suitable for medium to large facilities and venues.
The V34 is a high current hearing loop driver which powers hearing loops utilizing a single output. The V22a and V34a are dual output, high current hearing loop drivers with integral phase shifters for phased array configurations. These drivers have a Class-D amplifier output stage and an audio subsystem built around advanced digital systems including an ARM Cortex processor and dual DSPs.
Combined with a powerful CPU to ensure peak performance, the V Series PRO range provides self-monitoring and email alerts, remote setup over local area networks, guided hearing loop setup to make installation simple, and excellent speech and music reproduction.
Note: For large area hearing loop installation instructions, consult Contact’s Large Area Hearing Loop Installation Guide.

Components

contacta V34a PRO Hearing Loop Driver - Components

  1. NL4 Connector x2
  2. Rubber Feet x4
  3. 3.5mm Euroblock Connector x2
  4. Signage
  5. V22a Hearing Loop Driver
  6. Installation & User Guide
  7. Mounting Brackets
  8. IEC Power Lead

contacta V34a PRO Hearing Loop Driver - Components1

  1. NL4 Connector
  2. Rubber Feet x4
  3. 3.5mm Euroblock Connector x2
  4. Signage
  5. V34 Hearing Loop Driver
  6. Installation & User Guide
  7. Mounting Brackets
  8. IEC Power Lead

contacta V34a PRO Hearing Loop Driver - Components2

  1. NL4 Connector x2
  2. Rubber Feet x4
  3. 3.5mm Euroblock Connector x2
  4. Signage
  5. V34a Hearing Loop Driver
  6. Installation & User Guide
  7. Mounting Brackets
  8. IEC Power Lead

*Plug type varies by country.
Cable & Equipment: A length of loop cable determined by the loop design is also required. Hearing loop drivers also require additional equipment for audio feeds, such as a microphone or sound system.

Suitable Cable Lengths

The tables in this section show the approximate maximum cable lengths for differing maximum required currents.
Loop impedance (at 1.6kHz) should be less than the voltage capability of the driver (V22a: 22Vrms, V34: 34Vrms, V34a: 34Vrms) divided by the required current.
This achieves 400mA/m field strength at 1kHz.
V22a Single-Turn Hearing Loop (Metric)

Current 1A 2A 3A 4A 5A 6A 7A 8A
Impedance 21.3W 10.7W 7.1W 5.3W 4.3W 3.6W 3.0W 2.7W
Cable Type Cable Length
Maximum Cable Length Round Cable (AWG) 1mm 782m 391m 261m 195m 156m 130m 112m 98m
1.5mm 917m 458m 306m 229m 183m 153m 131m 115m
2.5mm 1031m 515m 344m 258m 206m 172m 147m 129m
Flat Cable (Width) 10mm 580m 290m 193m 145m 116m 97m 83m 73m
12.5mm 1097m 548m 366m 274m 219m 183m 157m 137m
25mm 1452m 726m 484m 363m 290m 242m 207m 182m

V22a Single-Turn Hearing Loop (Imperial)

Current 1A 2A 3A 4A 5A 6A 7A 8A
Impedance 36.0W 18.0W 12.0W 9.0W 7.2W 6.0W 5.1W 4.5W
Cable Type Cable Length
Maximum Cable Length Round Cable (AWG) 18AWG 2346ft 1173ft 782ft 587ft 469ft 391ft 335ft 293ft
14AWG 3132ft 1566ft 1044ft 783ft 626ft 522ft 447ft 392ft
Flat Cable (Width) 18AWG (equivalent) 2639ft 1320ft 880ft 660ft 528ft 440ft 377ft 330ft
14AWG (equivalent) 4171ft 2085ft 1390ft 1043ft 834ft 695ft 596ft 521ft

V22a Double-Turn Hearing Loop (Metric)

Current 1A 2A 3A 4A 5A 6A 7A 8A
Impedance 21.3W 10.7W 7.1W 5.3W 4.3W 3.6W 3.0W 2.7W
Cable Type Cable Length
Max Cable Length Round Cable (AWG) 1mm 568m 284m 189m 142m 114m 95m 81m 71m
1.5mm 614m 307m 205m 154m 123m 102m 88m 77m
2.5mm 645m 323m 215m 161m 129m 108m 92m 81m
Flat Cable (Width) 10mm 508m 254m 169m 127m 102m 85m 73m 63m
12.5mm 785m 392m 262m 196m 157m 131m 112m 98m
25mm 929m 465m 310m 232m 186m 155m 133m 116m

V22a Double-Turn Hearing Loop (Imperial)

Current 1A 2A 3A 4A 5A 6A 7A 8A
Impedance 36.0W 18.0W 12.0W 9.0W 7.2W 6.0W 5.1W 4.5W
Cable Type Cable Length
Maximum Cable Length Round Cable (AWG) 18AWG 2649ft 1324ft 883ft 662ft 530ft 441ft 378ft 331ft
14AWG 3027ft 1514ft 1009ft 757ft 605ft 505ft 432ft 378ft
Flat Cable (Width) 18AWG (equivalent) 3203ft 1601ft 1068ft 801ft 641ft 534ft 458ft 400ft
14AWG (equivalent) 4202ft 2101ft 1401ft 1050ft 840ft 700ft 600ft 525ft

V34 / V34a Single-Turn Hearing Loop (Metric)

Current 1A 2A 3A 4A 5A 6A 7A 8A 9A 10A 11A 12A
Impedance 21.30W 10.65W 7.10W 5.33W 4.26W 3.55W 3.04W 2.66W 3.57W 3.21W 2.92W 2.68W
Cable Type Cable Length
Max Cable Length Round Cable (AWG) 1mm 1146.1m 573.0m 382.0m 286.5m 229.2m 191.0m 163.7m 143.3m 127.3m 114.6m 104.2m 95.5m
1.5mm 1379.2m 689.6m 459.7m 344.8m 275.8m 229.9m 197.0m 172.4m 153.2m 137.9m 125.4m 114.9m
2.5mm 1550.7m 775.3m 516.9m 387.7m 310.1m 258.4m 221.5m 193.8m 172.3m 155.1m 141.0m 129.2m
Flat Cable (Width) 10mm 872.7m 436.3m 290.9m 218.2m 174.5m 145.4m 124.7m 109.1m 97.0m 87.3m 79.3m 72.7m
12.5mm 1650.4m 825.2m 550.1m 412.6m 330.1m 275.1m 235.8m 206.3m 183.4m 165.0m 150.0m 137.5m
25mm 2184.9m 1092.4m 728.3m 546.2m 437.0m 364.1m 312.1m 273.1m 242.8m 218.5m 198.6m 182.1m

V34 / V34a Single-Turn Hearing Loop (Imperial)

Current 1A 2A 3A 4A 5A 6A 7A 8A 9A 10A 11A 12A
Impedance 21.30W 10.65W 7.10W 5.33W 4.26W 3.55W 3.04W 2.66W 3.57W 3.21W 2.92W 2.68W
Cable Type Cable Length
Max Cable Length Round Cable (AWG) 18AWG 1105.5ft 552.7ft 368.5ft 276.4ft 221.1ft 184.2ft 157.9ft 138.2ft 122.8ft 110.5ft 100.5ft 92.1ft
14AWG 1476.0ft 738.0ft 492.0ft 369.0ft 295.2ft 246.0ft 210.9ft 184.5ft 164.0ft 147.6ft 134.2ft 123.0ft
Flat Cable (Width) 18AWG (equiv.) 1243.6ft 621.8ft 414.5ft 310.9ft 248.7ft 207.3ft 177.7ft 155.4ft 138.2ft 124.4ft 113.1ft 103.6ft
14AWG (equiv.) 1965.2ft 982.6ft 655.1ft 491.3ft 393.0ft 327.5ft 280.7ft 245.6ft 218.4ft 196.5ft 178.7ft 163.8ft

V34 / V34a Double-Turn Hearing Loop (Metric)

Current 1A 2A 3A 4A 5A 6A 7A 8A 9A 10A 11A 12A
Impedance 32.1W 16.0W 10.7W 8.0W 6.4W 5.3W 4.6W 4.0W 3.6W 3.2W 2.9W 2.7W
Cable Type Cable Length
Max Cable Length Round Cable (AWG) 1mm 855m 427m 285m 214m 171m 142m 122m 107m 95m 85m 78m 71m
1.5mm 924m 462m 308m 231m 185m 154m 132m 116m 103m 92m 84m 77m
2.5mm 971m 485m 324m 243m 194m 162m 139m 121m 108m 97m 88m 81m
Flat Cable (Width) 10mm 764m 382m 255m 191m 153m 127m 109m 95m 85m 76m 69m 64m
12.5mm 1181m 590m 394m 295m 236m 197m 169m 148m 131m 118m 107m 98m
25mm 1398m 699m 466m 350m 280m 233m 200m 175m 155m 140m 127m 117m

V34 / V34a Double-Turn Hearing Loop (Imperial)

Current 1A 2A 3A 4A 5A 6A 7A 8A 9A 10A 11A 12A
Impedance 36.0W 18.0W 12.0W 9.0W 7.2W 6.0W 5.1W 4.5W 4.0W 3.6W 2.9W 2.7W
Cable Type Cable Length
Max Cable Length Round Cable (AWG) 18AWG 2649ft 1324ft 883ft 662ft 530ft 441ft 378ft 331ft 294ft 265ft 241ft 221ft
14AWG 3027ft 1514ft 1009ft 757ft 605ft 505ft 432ft 378ft 336ft 303ft 275ft 252ft
Flat Cable (Width) 18AWG (equiv.) 3203ft 1601ft 1068ft 801ft 641ft 534ft 458ft 400ft 356ft 320ft 291ft 267ft
14AWG (equiv.) 4202ft 2101ft 1401ft 1050ft 840ft 700ft 600ft 525ft 467ft 420ft 382ft 350ft

Driver Area Coverage

Note: A full site survey of an installation area is recommended for optimal loop design.
Perimeter Loops
Perimeter loop areas detailed in the table on page 11 are valid only when the following conditions are met:

  1. Area is at the maximum current the driver is capable of delivering without voltage clipping at 1.6KHz
  2. Loop layout is designed to achieve 0dB in the centre
  3. 25mm x 0.1mm flat copper cable
  4.  Loop is installed in the floor
  5.  Listening height 1.2m (large perimeter loops may have areas where the actual signal level is higher than required)

Phased Array Loops
Phased array loop areas detailed in the table on page 11 are valid only
when the following conditions are met:

  1. Area is at the maximum voltage the driver is capable of delivering without voltage clipping at 1.6KHz
  2. Layout of 3m segment widths
  3. 25mm X 0.1mm flat copper cable is used
  4.  Loop is installed in the floor
  5. Listening height 1.2m
  6. Medium metal loss = 6dB
Area
Voltage Current 1:1 1:2 1:3
Perimeter loops
V34 Pro 34.0V 12.0A 702.25m² 882.00m² 1200.00m²
Phased array (no metal loss)
V22a Pro 22.6V 8.0A 1024.00m² 1104.50m² 1160.33m²
V34a Pro 34.0V 12.0A 1521.00m² 1740.50m² 1680.33m²
Phased array (medium metal loss)
V22a Pro 22.6V 8.0A 441.00m² 480.50m² 588.00m²
V34a Pro 34.0V 12.0A 676.00m² 840.50m² 867.00m²

Connections

Rear Panel Connections

contacta V34a PRO Hearing Loop Driver - Rear Panel

  1. Power Supply Input – The primary method of isolating the amplifier from the mains supply is to disconnect the mains plug. Ensure that the mains plug remains accessible at all times. Unplug the AC power cord from the AC outlet if the unit will not be used for several months or more.
  2.  Network Input – Ethernet port for setup and remote monitoring.
  3. Input A – Microphone or line in via 3 Pin Euroblock or XLR.
  4. Input B – Microphone or line in via 3 Pin Euroblock or XLR.
  5. Line Output – XLR port for connections with multiple drivers.
  6. USB – Storage transfer port.
  7. Loop A Output – NL4 port for Loop A.
  8. Loop B Output – NL4 port for Loop B.

Connection Examples

contacta V34a PRO Hearing Loop Driver - Connection Examples

Using the System

Startup

contacta V34a PRO Hearing Loop Driver - Startup

V Series PRO drivers perform a series of tests when powered on. The Contacte logo will appear and driver will therefore take between 40 to 60 seconds to become active.
Fault Detected
If a fault is detected, the Attention symbol will appear on the top right of the screen (contacta V34a PRO Hearing Loop Driver - icon ) along with an error message:

  1. Open Circuit [Primary/Secondary Loop]: See Connections on page 12 or consult the Contacte Large Area Loop Installation Guide to ensure the hearing loop is correctly installed and connected.
  2.  Short Circuit [Primary/Secondary Loop]: See Connections on page 12 or consult the Contacte Large Area Loop Installation Guide to ensure the hearing loop is correctly installed and connected.

The start-up sequence will be halted. Power should be removed and reapplied to the driver once the fault has been addressed.
Loop Attenuation

contacta V34a PRO Hearing Loop Driver - Startup1

If the ‘ATTN’ (Loop Attenuation) symbol (contacta V34a PRO Hearing Loop Driver - icon1 ) appears on the screen, the driver has detected that due to the characteristics of the loop(s) connected it will be unable to deliver maximum rated current without clipping at 1.6Kz. Maximum current will therefore be attenuated.
Front Panel Overview

contacta V34a PRO Hearing Loop Driver - Front Panel

  1. Display Screen – Displays menu and adjustment options.
  2. Control Dial – Used to unlock the driver and make a range of system adjustments. Rotate the dial clockwise or counter-clockwise to make a selection, then press to confirm any adjustments.

Note: When using V Series PRO menus, selecting “Return” sends the user to a previously displayed screen. Selecting “Exit” will send them to the main menu.
Locking/Unlocking the Hearing Loop Driver

contacta V34a PRO Hearing Loop Driver - Front Panel1

Unlock the Driver

  1. To unlock the hearing loop driver, press the control dial, and when prompted “Unlock driver?” click “Yes.”
  2. Enter the passcode 2239:
    a. Rotate the control clockwise to select the first required digit.
    b. Press the control dial in to select the digit.
    c. Repeat steps (a) and (b) until all the digits have been selected.

Note: Entering the wrong code returns the hearing loop driver to the lock screen.
When the control dial is not used for half an hour, the hearing loop driver will automatically lock.
Signal Activity Indicators
When the driver is locked, the “ABC” indicators on the bottom left of the screen display signal activity on the driver inputs.

contacta V34a PRO Hearing Loop Driver - Front Panel2

Each letter are shown in green, yellow, or red, corresponding to low, good, or high signal levels respectively.
The “A” and “B” indicators show the levels of the A and B inputs. This is the level after the corresponding input gain control, but before the AGC. If the AGC is not enabled, it is important that A or B are indicating acceptable levels. If the AGC is enabled, this is less important as the AGC will compensate for a wide range of levels.
The “C” indicator shows the signal level within the signal chain after the AGC, if enabled, has been applied. It is normal to see activity here, at least on program peaks.
If the driver appears to stop working, and no changes have been made, the ABC indicators will assist the user by showing whether the inputs are active.
Main Menu
After being unlocked, the hearing loop driver will display the main menu.

contacta V34a PRO Hearing Loop Driver - Front Panel3

Inputs
Selecting Inputs from the main menu opens the following screen:

contacta V34a PRO Hearing Loop Driver - Front Panel4

  • Input A – Adjust connections to Input A.
  • Input B – Adjust connections to Input B.
  • Audio Time Delay – Sync audio across large distances to compensate for latency.
  • Low Cut Filter – Audio filter for when there is low frequency background noise in the surrounding environment of a loop.

Input A/B

  1. Menus for Input A and Input B are functionally identical. Selecting either Input A or Input B opens the following screen:contacta V34a PRO Hearing Loop Driver - Front Panel5
  2. Turning on Phantom Power sends power to a connected microphone via the selected input. When either Input A or Input B has enabled this function, a symbol will appear on the left of the display (see page 51 for Notification Guide).contacta V34a PRO Hearing Loop Driver - Front Panel6
  3. Once you have made a selection on the Phantom Power screen, the driver will display the following screen:contacta V34a PRO Hearing Loop Driver - Front Panel7• Adjustment Level – Displays the input attenuation level (0db to -47dB). Selecting this circle allows attenuation level adjustment.
    • Signal Level – When optimum Adjustment Level has been achieved, “Good” will display consistently (though peak levels may flash to “Low or “High”). Consistent display of “Low” or ”High” means the level is incorrect and automatic gain control cannot operate.

Audio Time Delay
Selecting Audio Time Delay from Inputs opens the following screen:

contacta V34a PRO Hearing Loop Driver - Front Panel8

In theatres, stadiums, and other large venues, sound sent from speakers will be impacted by the speed of sound, whereas audio sent through a hearing loop will reach a user instantly. This means the two sounds must be aligned or users will hear a constant echo.
Select the screen’s circle to adjust syncing and compensate for latency.
Low Cut Filter
Selecting Low Cut Filter from Inputs opens the following screen:

contacta V34a PRO Hearing Loop Driver - Front Panel9

This feature removes low frequency sounds from the hearing loop when background noise such as air conditioners might impact users.
Select either 150Hz or 180Hz if required and a green ‘LCF’ (Low Cut Filter) symbol will be displayed on the left.

Guided Loop Setup

Guided Loop Setup ensures that hearing loops achieve optimum field strength,* ideal frequency response, and avoid clipping.
Only begin Guided Loop Setup once the connected hearing loop cable has been laid in place and all relevant connections have been made (see page 12).
*This is dependant on correct loop design and metal loss.
Required for Setup

  • FSM – Contacte Field Strength Meter (IL-CONTACTA-FSM)
  • Tripod or similar for mounting the FSM is recommended

Begin the Setup
Begin the Guided Loop Setup by selecting it from the driver’s main menu, and when prompted select “Yes” from the following screen:

contacta V34a PRO Hearing Loop Driver - Front Panel10

For large area hearing loop cable installation instructions, consult Contact’s Large Area Hearing Loop Installation Guide.
Note: The guided loop setup will optimise the loop signal at the point used to take the measurement. Therefore, there may be variations in the signal coverage where no measurements have been taken and fed into the driver.
Stage 1: High Frequency Compensation
High Frequency Compensation will be suggested by the driver when measurements in this section indicate metal in the surrounding environment impacts the hearing loop’s signal quality.

  1. Select “Yes” when prompted by the following screen:contacta V34a PRO Hearing Loop Driver - Front Panel11
  2. The driver will begin outputting a pink noise signal at a low level (1A on peaks) to allow accurate setup. The following screen will be displayed, with a symbol on the top right indicating “Signal On”:contacta V34a PRO Hearing Loop Driver - Front Panel12
  3. Note the hearing loop’s field strength at 100Hz, 1KHz, and 5KHz using the Contacta Field Strength Meter (IL-CONTACTA-FSM) set at the 3rd octave band pass setting. Once this is completed, select “Next” on the display to turn off the signal.
  4. Enter the three levels into the hearing loop driver. The “Backspace” button will become a “Next” button when the correct number of digits have been entered for each value:contacta V34a PRO Hearing Loop Driver - Front Panel13
  5. When the three levels have been entered, one of following options will be displayed (see next page):
    5a. If the values at 100Hz and 5KHz are within +/-3db of the value measured at 1KHz, this section is complete. Select “Next”:contacta V34a PRO Hearing Loop Driver - Front Panel145b. If the driver has calculated that High Frequency Compensation is required, it will ask whether to apply this correction. Selecting “Yes” is recommended.contacta V34a PRO Hearing Loop Driver - Front Panel155c. If the driver cannot provide ideal High Frequency Compensation, it will ask whether to apply the maximum adjustment available. Selecting “Yes” is recommended.contacta V34a PRO Hearing Loop Driver - Front Panel16

Stage 2: Loop Drive

  1. Select “Yes” when prompted by the following screen:contacta V34a PRO Hearing Loop Driver - Front Panel17The driver will begin outputting a 1KHz sinewave signal at a low level (2Arms) to allow accurate setup.
  2. The following screen will be displayed, with a symbol on the top right indicating “Signal On”:contacta V34a PRO Hearing Loop Driver - Front Panel18
  3. Note the hearing loop’s field strength at 1KHz using the Contacte Field Strength Meter (IL-CONTACTA-FSM) set at the 3rd octave band pass setting. Once this value has been noted, select “Next” on the display to turn off the signal.contacta V34a PRO Hearing Loop Driver - Front Panel19
  4. Enter the noted level into the hearing loop driver.
  5. One of following three options will be displayed:
    5a. If the driver has calculated the ideal peak current to achieve 0dB, the following screen will appear and this section is complete. Select “Apply this level”:contacta V34a PRO Hearing Loop Driver - Front Panel205b. If the driver cannot deliver the current required to achieve 0dB it will display the following screen:contacta V34a PRO Hearing Loop Driver - Front Panel21
    Select “Yes” when asked to apply the maximum unclipped current.
    5c. If the ideal current is greater than is possible (due to the characteristics of the loop(s) connected being unsuitable to deliver maximum rated current without clipping at 1.6Kz), the maximum current will be attenuated and the maximum value will be
    displayed:contacta V34a PRO Hearing Loop Driver - Front Panel22Select “Next”. The driver will make adjustments to achieve the strongest maximum field strength possible.

Stage 3: Loop Uniformity

  1. Select “Yes” when prompted by the following screen:contacta V34a PRO Hearing Loop Driver - Front Panel23The driver will begin outputting a 1Arms at 1KHz sinewave signal at a level below the calculated current required to hit 0dB field strength.
  2. The following screen will be displayed, with a symbol on the top right indicating “Signal On”:contacta V34a PRO Hearing Loop Driver - Front Panel24
  3. Record field strength at various locations in the hearing loop using the Contacte FSM set 1KHz 3rd octave band pass setting. These details will be required in Compliance Certificate documents. Then, select “Next”.

Stage 4: Completion

  1. Select “Yes” when prompted by the following screen to complete the Guided Loop Setup to save settings:contacta V34a PRO Hearing Loop Driver - Front Panel25

Manual Loop Setup

Note: Most users will obtain the best performance from a V-Pro driver using the Guided Loop Setup. Manual setup mode can render an installation non-compliant with standards if done incorrectly. Enter this menu only if you are competent and qualified to proceed with Manual Loop Setup.
Begin Manual Loop Setup by selecting the option from the driver’s main menu.
Note: For large area hearing loop cable installation instructions, consult Contact’s Large Area Hearing Loop Installation Guide or design software suites.

contacta V34a PRO Hearing Loop Driver - Front Panel26

Manual setup allows the selection of the following functions:

  • AGC Select: Enable or disable the Automatic Gain Control.
  • HFC Select: Set High Frequency Compensation (metal correction).
  • Set Drive Level: Set the Output Drive Level.
  • Test Sig Select: Enable the internal Test Signal Generator.
  • Output Phasing: Select non-standard output phasing (phased drivers only).
  • Line Output: Set the level at the line output XLR jack.

AGC (Automatic Gain Control) Select
This screen allows automatic gain control to be disabled or enabled.

contacta V34a PRO Hearing Loop Driver - Front Panel27

If the AGC is disabled the input gain may need to be adjusted on the Inputs setting screen. This is particularly the case if the input level is low in relation to the input gain and was previously being normalised by AGC.
Note: If Guided Setup is subsequently used after Manual Setup, AGC will be automatically re-enabled.
HFC Select
This screen allows high-frequency compensation to be adjusted from 1 (weak) to 7 (strong).

contacta V34a PRO Hearing Loop Driver - Front Panel28

HFC is required when metal in the surrounding environment impacts the hearing loop’s signal quality.
Set Drive Level
This screen allows the current in the primary loop to be adjusted.

contacta V34a PRO Hearing Loop Driver - Front Panel29

The maximum current will be limited to the specified level for the driver, and no attempt should be made to exceed this. If the driver is a phased unit, it will be possible set the secondary output (bottom right of the screen).
Note: Setting the driver to output currents in excess of the specified value will void the warranty.
If the driver is being set up from a remote device, increase the current gradually by clicking at the start of the level setting arc.
Phased Drivers Only: Secondary Output
This screen allows the current in the secondary loop in phased drivers to be adjusted.

contacta V34a PRO Hearing Loop Driver - Front Panel30

In phased drivers it is important to set primary and secondary currents to similar values or the advantages of a phased system will be lost.
Test Sig Select 
This screen allows the internal test signal generator to drive output stages.

contacta V34a PRO Hearing Loop Driver - Front Panel31

The internal signal chain is driven at relatively low level, meaning this function is not intended for setting final output levels. However, levels of the signals at different frequencies are well matched, making the function suitable for frequency response testing.
All selections other than “Off” will have the following additional effects on the driver:

  • The internal cooling fans will run up to full speed.
  • The normal input signal will be disconnected.
  • The loop continuity test signal will be disabled to allow accurate current measurements.

Effects listed above will be cancelled when the TSG mode is set to “Off” or when Manual Setup mode is exited.
The TSG signal will remain on while within the Manual Setup functionality unless manually switched off. This is to allow manual adjustment of HF compensation.
Output Phasing
This screen determines the phase relationship between the primary and secondary outputs on phased drivers.

contacta V34a PRO Hearing Loop Driver - Front Panel32

In phased systems it is vital that the output phase relationship remains set to Standard Phasing. The driver will not act as a proper phased device in any other mode.
There are two other phasing options:

  • No Phasing” causes the two outputs to operate in phase with each other. The driver is no longer phased in the manner required to produce uniform field coverage
  • Sec Reverse” inverts the phase of the secondary output. This is the same as reversing the electrical connections to one (but not both) of the driver outputs of an un-phased driver.

Line Output
This screen sets the output level of the balanced line output XLR jack on the rear of the driver.contacta V34a PRO Hearing Loop Driver - Front Panel33

Note: Line Output Level should usually remain at 1.00 and only be reduced if advised by an educated installer.
This output is not processed by the AGC to eliminate the possibility of “double AGC-ing” by devices further down the audio chain.
The signal level is the sum of the signal at inputs A and B. This means that the gains of the two inputs must be set to give an adequate output level at the line output connector.
The phase relationship between the Line output and the driver loop outputs is not guaranteed.

Diagnostics

Selecting Diagnostics from the main menu opens the following screen:

contacta V34a PRO Hearing Loop Driver - Diagnostics

Loop
Selecting Loop from the Diagnostics menu opens the following screen:

contacta V34a PRO Hearing Loop Driver - Diagnostics1

  • Loop inductance and resistance are values measured when the driver powers on.
  • Hearing loop impedance at 1.6KHz (“[email protected]) is calculated from the measured inductance and resistance.
  • Maximum current is calculated from the driver voltage divided by the impedance at 1.6KHz.
  • If impedance exceeds the limit the maximum current will be attenuated to prevent clipping.

Driver
Selecting Driver from the Diagnostics menu opens the following screen:

contacta V34a PRO Hearing Loop Driver - Diagnostics2

The following data in Driver is for information only:

  • Output enabled (Yes/No)
  • Heatsink temperature
  • Fan speed
  • Supply rail voltage

Counters
Selecting Counters from the Diagnostics menu opens the following screen:

contacta V34a PRO Hearing Loop Driver - Diagnostics3

Counters logs the number of times these events have occurred in the lifetime of the driver:

  • Power cycles – Power has been recycled.
  • Clipping – Voltage clipping has been detected.
  • Overtempt – Internal temperature has exceeded limits.
  • Overcurrent – Output current has exceeded limits.
  • Loop o/c – Open circuit loop(s) have been detected.

Service
Selecting Service from the main menu opens the following screen:

contacta V34a PRO Hearing Loop Driver - Srtting

  •  Go to Idle Screen: The driver displays an idle screen. An unlock code will not be required to make adjustments/change settings.
  • Go to Idle Screen + Lock: The driver displays an idle screen. An unlock code will be required to make adjustments/change to settings.
  • Time out setting: Adjust the time before the driver displays an idle screen from between 0 (no return to idle screen) to 60 minutes. This is adjustable in 1-minute steps.
  • Reboot Device: Restart the driver. Confirmation (Yes/No) is requested.
  • Save settings to USB: The driver saves all user settings to a USB flash drive (see page 33).

Save/Load Settings to USB Flash Drive

Automatic Saving
Settings changed in the Guided Setup or Manual Loop Setup are updated once the user completes the setup. Completing the setup will return to the main menu screen where all settings are saved locally.
USB Flash Drive – Saving and Loading

  1. If a USB flash drive is connected to the driver, it will scan for a valid save file. The save file name must match the driver’s model (V22a, V34, or V34a).
  2. If a valid save file is located on the USB flash drive, the driver will ask if these settings should be loaded:contacta V34a PRO Hearing Loop Driver - Srtting1• Selecting “Yes” will load the file and overwrite settings saved on the driver, followed by a confirmation message:contacta V34a PRO Hearing Loop Driver - Srtting2• Selecting “No” will return the driver to the main menu.
  3. To save settings to a USB flash drive, select “Save settings to USB” from the service menu. If no previous save file is located on the USB flash drive, the driver will save current settings and display the following message:contacta V34a PRO Hearing Loop Driver - Srtting3Selecting “Menu” will return to main menu.
    If a valid save file already exists on the USB flash drive, the following message will be displayed instead:contacta V34a PRO Hearing Loop Driver - Srtting4• Selecting “Yes” will update the settings on the USB flash drive and display a message confirming that all settings have been saved.
    • Selecting “No” will return the driver to the main menu.

System Updates

There are 2 types of system updates:

  • Software updates (see page 35)
  • Disk image updates (see page 36)

Software updates require the following 4 files to be placed in the root (top-level/default) directory of a USB connected to the driver:

  • pn1001-image-imx6ul-var-dart.ubi
  •  pn1001-image-imx6ul-var-dart.ubi.sig
  • update.sh
  • update. sh. sig

Disk image updates requires the same 4 files as the software update and an 4 additional files (for a total of 8 files):

  • SPL-nand
  • SPL-nand. sig
  • u-boot. imgnand
  •  u-boot. img-nand. sig

The average update (software or disk image) takes three minutes to both finish installation and restart the system.
Note: Update related screens do not timeout to idle screens.
Software Updates – USB
Note: The driver software should be updated prior to installation. Drivers already connected to a hearing loop should not be updated as this may cause settings to alter.
Software updates can be run from a connected USB without any risk to the driver. If a USB is removed midway, the device will restart while maintaining the previously installed version of the software.
Generic V PRO software updates work for all drivers in the range.
When a USB has been connected, relevant updates will be automatically completed for any model (V22a, V34, V34a) in the range.

  1. To install a software update, connect a USB device which contains the required files.
  2. Select “Yes” when prompted by the following screen:contacta V34a PRO Hearing Loop Driver - Srtting53a. If the USB’s files are valid, the driver will begin install the update before automatically restarting. The following screen will appear:contacta V34a PRO Hearing Loop Driver - Srtting63b. If any of the USB’s files are not valid, the driver will display the following screen:contacta V34a PRO Hearing Loop Driver - Srtting73c. If the above error message appears, ensure the USB drive contains only update files – other files on the drive will prevent the update from occurring. We recommend using a formatted USB drive.

Disk Image Updates – USB
If the driver is low on memory, there will be a warning if a disk image update is attempted as the driver could be damaged if the USB is then removed mid-update. The user will be asked to confirm that they are aware of this risk.

  1. To install a disk update, connect a USB device which contains the required files.
  2. Select “Yes” when prompted.
  3. The driver will scan the USB’s files.
    3a. If all files are valid, the driver will begin install the update and display this screen to the user before automatically restarting. The following screen will be displayed:contacta V34a PRO Hearing Loop Driver - Srtting83b. If the USB’s files are not valid, the following screen will display:contacta V34a PRO Hearing Loop Driver - Srtting93c. If the above error message appears, ensure the USB drive contains only update files – other files on the drive will prevent the update from occurring. We recommend using a formatted USB drive.

Remote Monitoring
The driver’s user interface (settings screen) is accessed via a Local Area Network (LAN) connection and a browser on a laptop or smartphone. This allows easier adjustment of the driver on site during setup.
Accessing remote monitoring

  1. For browser access the IP address of the driver may be discovered from the Remote Monitoring screen. To access this, select Remote Monitoring from the main menu to open the following screen:contacta V34a PRO Hearing Loop Driver - Srtting10
  2. The driver’s IP address will be displayed. Enter this string of numbers into the browser of your laptop or smartphone to externally access the driver’s display. This screen also shows the MAC address and PIN number which are needed when registering
    the driver on the cloud dashboard.
  3. Press “Connect” when prompted.
  4. Enter “root” as the password when prompted.

Changing network settings
To change network settings, click “Settings” from the “remote monitoring” screen.

contacta V34a PRO Hearing Loop Driver - Srtting11

Here you can choose the IP address assignment method to be via DHCP or statically set.
By default, DHCP is used. To set an IP address manually, you will need the following information: IP address, Subnet Mask and Gateway.
By clicking “Static” the driver will ask for this information. A Static IP address should only be assigned if the network IP address allocation is fully understood.

Contacte Dashboard

The Contacte Dashboard is a platform that allows users to set up email alerts; these alerts will keep users informed about the status of their driver and inform them if any issues occur.
The Contacte Dashboard also allows users to track the health of their V PRO drivers over the internet. All data is logged into the Contacta Dashboard cloud system which can then be viewed on any device.
Settings of drivers can also be managed remotely; for example, where notification emails are sent to, and the recorded locations of the devices.
Getting Started
Using the system is a two-part process to get set up:

  1. Register the device (once per device).
  2. Register an installer account on the dashboard (one-time set up).

The first part is to register drivers on the logging platform. You do this once per device while you are installing the device on-site. Simply fill out a form which describes the client name, location, and contact details for notifications.
Then, register an account on the Contacta Dashboard platform. This is a one-time process to verify your installer email address and set up an account password.
After that, all new devices registered to that installer email will automatically be managed in your Contacta Dashboard account.
Device Registration

  1. Register a device during the on-site device installation process.
    During the setup of the device you will be provided with:
    • The mac address of the device
    • A 4-digit access control pin number
  2. Visit the Contacta Dashboard platform setup page: https://log.contactadashboard.com/login.php
  3. Log in with your mac / validation number:contacta V34a PRO Hearing Loop Driver - Srtting12
  4. After logging in, complete the following form. Ensure that you are using the same installer email address on all devices that you wish to manage from the same dashboard account.contacta V34a PRO Hearing Loop Driver - Srtting13A confirmation email will be sent to all email addresses you listed (installer, plus any customer notification email addresses used).
    Note: If a wrong email address is used, come back to this form at any time and re-register the device. This will overwrite the previously registered details.
  5. Confirm with each recipient that the emails have been received and were not caught in spam filters.
    Ask any relevant email management companies to ensure emails from the Contacte address are whitelisted. If you have opted to send notifications to clients, pass this information on to them so that they can whitelist it.

Account Registration
All registered drivers are managed at: https://www.contactadashboard.com/

  1. When accessing the Contacte Dashboard a login page will appear:contacta V34a PRO Hearing Loop Driver - Srtting14
  2. Click the “Register here” link below the login box.
  3. Fill the form using the installer email address entered in the previous device registration form (see page 40).
  4. Once this form is completed, verify your email address.
  5. A verification link will be sent to the installer email address. Click the link to verify ownership of your email system.
  6. Log in to the Contacte Dashboard platform.
    Note: Your account will stay logged in until you log out. This makes it convenient for you to quickly get back into the dashboard and check on a device. To log out, use the button in the top right-hand corner of the dashboard.

Device Management
The following device summary page appears on the homepage of the Contacte Dashboard:

contacta V34a PRO Hearing Loop Driver - Srtting15

This page is divided into four sections:

  • The navigation menu down the left-hand side.
  • Four panels showing the device check in stats.
  • A list of recent events generated by your devices.
  • The account information in the top right.

The navigation menu lets you access all of the features of the site.
On small screens this may be hidden by default. Tap the menu button to expand it:
contacta V34a PRO Hearing Loop Driver - icon2 Dashboard
contacta V34a PRO Hearing Loop Driver - icon3 The first option is the Device Summary page (the home page):
contacta V34a PRO Hearing Loop Driver - icon4 The third icon allows fast navigation to device settings pages:
contacta V34a PRO Hearing Loop Driver - icon5 The fourth icon provides detailed device history, temperature and health information:
contacta V34a PRO Hearing Loop Driver - icon6 Device Check-In Stats
At the top of the main page is an overview of all devices registered on the system:

contacta V34a PRO Hearing Loop Driver - Srtting16

A device is classed as offline if it hasn’t logged information into the cloud for more than 1 hour.
If you see red notices in the “Offline Devices” section noting drivers that should be online, any relevant hearing loop drivers must be assessed in person.
Recent device events

contacta V34a PRO Hearing Loop Driver - Srtting17

Recent device events lists any recent activity of registered drivers.
Registered devices
The registered devices page lists all devices registered to the current installer email account.

contacta V34a PRO Hearing Loop Driver - Srtting18

Filter devices using the filter function in the header of the table.
Within the “type to filter devices…” text box, simply type any identifying characteristic of the device.
For example, based on the screenshot above, typing “soka” would filter to all devices registered to the client “SOKA Studio”; or instead, filter a certain site by typing something like “head office”. Data can also be matched from the driver location, driver zone and model columns.
If the device is currently in a fault or caution error state, then the row will be highlighted in red or amber.
The last column has two shortcut buttons which will navigate you to the pages described in the next section:

  • contacta V34a PRO Hearing Loop Driver - icon7 The left icon takes you to the device settings page.
  • The right icon takes you to the device history page.

Device Settings
The device settings page shows the device info in the top panel. These are fixed fields which were specified at the devices registration and do not change.
The second panel contains the device settings. Manage the client and device location details here, plus set up the email addresses that any alerts are sent to.
To add multiple emails into the email notifications field, type an email address followed by a space. To remove an email address click the grey x on the right of each email tag.

contacta V34a PRO Hearing Loop Driver - Srtting19

To make changes to this section simply type the new details into the page, then scroll to the bottom of the page, and press the Update Settings button:

contacta V34a PRO Hearing Loop Driver - Srtting20

Note: If you want to completely disable email alerts for a device you can do a combination removing all of the email tags in this screen and then setting the “Send Alerts To” field to “Client”.
Device History
The device history page shows the entire history of that device.
This includes a panel at the top which shows the information that you have configured inside the device settings page:

contacta V34a PRO Hearing Loop Driver - Srtting21

There is also a button to navigate back to the Device Settings page.
Just click Edit Device to make changes to that device.
Further down a graph of its temperature if the device has been active in the last 24 hours:

contacta V34a PRO Hearing Loop Driver - Srtting22

The next part of the page is the Device Health section. If there are any issues with the device such as it heating up past the recommended threshold temperatures, it loosing contact with the loop, or the device resetting, you will see these events in this table:

contacta V34a PRO Hearing Loop Driver - Srtting23

The device health comprises of 3 columns. Event Date is when the device health event was logged. The type is the internal error code that was generated. This is a bit technical so next to it you will also find a Summary column which explains what the issue is and gives some more information about the parameters which triggered it.
The last table on this page is the Activity Log. The device sends a full diagnostic log to the cloud multiple times per hour. Each logged activity entry for devices can be found here.

contacta V34a PRO Hearing Loop Driver - Srtting24

A selection of the most useful fields have been added as columns along the table.
If a column with two values is separated by a slash, this is a phased device. The left is the primary and the right is the secondary values.:

contacta V34a PRO Hearing Loop Driver - Srtting25

On the right hand side there is a details button:

contacta V34a PRO Hearing Loop Driver - Srtting26

Because the device logs a large amount of diagnostic data per-event, it would not all fit in on this summary table.
Click this button to see a detailed table of every item which has been submitted:

contacta V34a PRO Hearing Loop Driver - Srtting27

Scroll this window down to see more entries on the table.
Use the X in the top right-hand corner to close this dialogue box or simply click outside of the dialogue box.
If one of these activity log events has report device health issues then the row will be highlighted, and the details will be listed in the error column:

contacta V34a PRO Hearing Loop Driver - Srtting28

Troubleshooting

Symptom Possible Fault Action
Driver does not turn on. 1)  Mains power is absent.
2)   Internal issue.		 1)  Check mains power.
2)   Seek assistance.
Interference (buzzing/ whistling/hissing) is heard through induction loop. 1)  Poor input signals.
2)   Internal issue.		 1)  Power off the hearing loop driver and confirm that interference isn’t from external origin.
2)   Disconnect input signals. If sound disappears, check inputs.
Driver is excessively hot to touch. 1)  Large amount of mains hum present on input.
2)   Internal issue.		 1)  Check input signal source.
2)   Incorrect hearing loop driver being used.
Loop output level indicates current is flowing but I hear nothing in the loop. 1)  Shorted feeder cable.
2)   Loop listener is not working or being used too far from loop.		 1)  Check feeder cable, although the hearing loop driver will usually refuse to tune to shorted feeder.
2)   Check listener and location.
Sound is distorted. 1)  Input level has been turned up too high for signal level at input.
2)   Input signal is distorted.
3)   Output signal is clipping.		 1)  Reduce input level setting.
2)   Check signal source.
3)   Refer to “The Clipping Status Lights are lit” below.
Audio from the hearing loop driver is clipping. The connected hearing loop cable is too long. 1)  Reduce the length of the hearing loop cable.
2)   Use a larger diameter cable.
3)   Create a two-turn loop.
4)   Use a higher voltage driver.

Please contact your distributor (or Contacte if appropriate) if you are experiencing technical difficulties with the product.
Notification Guide
contacta V34a PRO Hearing Loop Driver - icon8 Attention
contacta V34a PRO Hearing Loop Driver - icon9 Phantom Power Inputs A + B are on
contacta V34a PRO Hearing Loop Driver - icon10 Phantom Power Input A is on
contacta V34a PRO Hearing Loop Driver - icon11 Phantom Power Input B is on
contacta V34a PRO Hearing Loop Driver - icon12 Low Cut Filter is on
contacta V34a PRO Hearing Loop Driver - icon13 Loop is being attenuated
contacta V34a PRO Hearing Loop Driver - icon14 Signal on

Loop Resistance

contacta V34a PRO Hearing Loop Driver - icon8 Primary loop resistance too high! Check loop and connections  Consult user guide Secondary loop resistance too high!
If you encounter the above fault message indicating an issue with the loop, follow the steps outlined below for effective diagnosis and resolution.
Step 1
Reset the mains power. If the error message reappears, proceed to step 2.
Step 2

  1. Disconnect both the power and the hearing loop(s).
  2. Use a multi-meter to measure the resistance of the loop.
  3. Measure the resistance at the NL4 connector, specifically between the conductors used: either 1a – 1b or 2a – 2b.
  4. Ensure that the resistance readings are below the specified values:
    • V22A: Less than 40Ω
    • V34: Less than 64Ω
    • V34a: Less than 64Ω
  5. If the loop resistance exceeds the aforementioned values but isn’t an open circuit, consider the following possibilities:
    a. The loop, including the feeder cable, surpasses the maximum allowable resistance due to excessive length, inadequate gauge size, or a combination of both. Investigate the underlying cause(s) for this.
    b. If the reading indicates an open circuit, it’s likely that there’s a physical break in the loop or feeder cable. Investigate and identify the cause of this.

If the loop resistance falls within the specified values (typically less than half these values), the issue could stem from the loop being inadvertently connected to mains or building ground (Earth).

Step 3

  1. With the mains power disconnected, detach the loop connector.
  2.  Set the multi-meter to Megaohms (MΩ) and measure the resistance of the loop connections and a suitable ground/earth connection. This can include the chassis of an earthed electrical equipment, exposed metal pipes (water or gas), or conduit.
  3. Ensure that the measured resistance is greater than 10MΩ. Take care not to touch the meter connections while measuring, as this can impact the accuracy of the reading.
    4a. If the reading exceeds 10MΩ or the meter indicates an open circuit (O/C) for V22a or V34a, proceed to step 4. For a V34 issue, it’s recommended to seek guidance from your supplier or installer.
    4b. If the measured reading is below 10MΩ, there may indicate a serious fault with the loop insulation.. Extremely low readings could indicate a significant fault with the loop insulation.

Before proceeding, address any concerns related to loop insulation.
Step 4

  1. Set your multi-meter to the Megaohms (MΩ) range. Take care not to touch the meter connections during measurement, as this could influence the reading.
  2. Measure the resistance between both loops using the multi-meter. The measured resistance should exceed 10MΩ.
  3. If the measured resistance falls below 10MΩ, investigate the insulation of the loop/feeder cable and inspect the points where the loops come into physical contact with each other.
  4. If the measured resistance is higher than 10MΩ or the meter shows an open circuit (O/C), it’s recommended to get in touch with your supplier or installer for support.

Technical Specification

V22a:

Technical Data
Audio Inputs 2 X line/microphone inputs (switchable) XLR or Euroblock Line (optimised for -10dBV to 0dBv)
Microphone (12V phantom power via 680W optimised for levels above -45dBv)
Loop Outputs Outputs Voltage 2 x 22.66Vrms (64.09V pk-pk)
Output Current 2 x 8Arms @ 1KHz (22.62A pk-pk) >1200 seconds (20 minutes)
Loop Connector 2 x NL4
Audio System Frequency Response 100Hz to 5KHz
Distortion THD<1% (-40dB) full current both channels driven
Automatic Gain Control DSP controlled, peak detecting
High Frequency Compensation 7 DSP controlled, optimised stages
Audio Signal Delay 10ms to 40ms
Display Backlit TFT 480 x 128 pixels (95mm x 25mm)
Control Single Rotary Push Control
Mains Input Voltage 100V-120V /200V-240V AC (universal auto switching with PFC)
Frequency 50Hz/60Hz
Connection IEC
Cooling Custom heatsink with temperature-controlled fan

V34:

Technical Data
 

Audio Inputs

 2 X line/microphone inputs (switchable) XLR or Euroblock Line (optimised for -10dBV to 0dBv)
Microphone (12V phantom power via 680W optimised for levels above -45dBv)
Loop Outputs Outputs Voltage 34Vrms (96.1V pk-pk)
Output Current 12Arms @ 1KHz (33.94A) pk-pk >1200 seconds (20 minutes)
Loop Connector NL4
Audio System Frequency Response 100Hz to 5KHz
Distortion THD<1% (-40dB) full current both channels driven
Automatic Gain Control DSP controlled, peak detecting
High Frequency Compensation 7 DSP controlled, optimised stages
Audio Signal Delay 10ms to 40ms
Display Backlit TFT 480 x 128 pixels (95mm x 25mm)
Control Single Rotary Push Control
Mains Input Voltage 100V-120V /200V-240V AC (universal auto switching with PFC)
Frequency 50Hz/60Hz
Connection IEC
Cooling Custom heatsink with temperature-controlled fan

V34a:

Technical Data
 

Audio Inputs

 2 X line/microphone inputs (switchable) XLR or Euroblock Line (optimised for -10dBV to 0dBv)
Microphone (12V phantom power via 680W optimised for levels above -45dBv)
Loop Outputs Outputs Voltage 2 x 34Vrms (96.1V pk-pk)
Output Current 2 x 12Arms @ 1KHz (33.94A) pk-pk >1200 seconds (20 minutes)
Loop Connector 2 x NL4
Audio System Frequency Response 100Hz to 5KHz
Distortion THD<1% (-40dB) full current both channels driven
Automatic Gain Control DSP controlled, peak detecting
High Frequency Compensation 7 DSP controlled, optimised stages
Audio Signal Delay 10ms to 40ms
Display Backlit TFT 480 x 128 pixels (95mm x 25mm)
Control Single Rotary Push Control
Mains Input Voltage 100V-120V /200V-240V AC (universal auto switching with PFC)
Frequency 50Hz/60Hz
Connection IEC
Cooling Custom heatsink with temperature-controlled fan

Standards

EMC

  • BS EN 55103-1: 2009 (EMC emissions)
  • BS EN 55103-2: 2009 (EMC immunity)

This product has been designed and tested to comply with the following North American and Canadian standards:

  • FCC class “B” EMC (emissions)
  • ICES-003

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
CAUTION: Changes or modifications not expressly approved by Contacta Systems LTD or an authorised partner could void the user’s authority to operate the equipment.
Correct disposal of this product
This marking indicates that this product should not be disposed with other household waste throughout the EU. To prevent possible harm to the environment or human health from uncontrolled waste disposal and to conserve material resources, this product should be recycled responsibly. To dispose of your product, please use your local return and collection systems or contact the retailer where the product was purchased.

Local dealer:
UK & ROW
+44 (0) 1732 223900
[email protected]
www.contacta.co.uk
US & Canada
+1 616 392 3400
[email protected]
www.contactainc.com

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