Contacta V Series Installation & User Manual
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Contacta V Series Installation & User Manual

Hearing loop driver
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V22
Hearing Loop Driver
Installation &
User Guide
May 2021
1

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Summary of Contents for Contacta V Series

  • Page 1 Hearing Loop Driver Installation & User Guide May 2021...

  • Page 2: Table Of Contents

    19-24 Troubleshooting Warning / Error Messages Technical Specifications Contacta has a policy of continuous product development, therefore small specification changes may not be reflected in this manual. Images, labels, packaging, accessories and product colors are subject to change without notice.

  • Page 3: Product Overview

    Product Overview Our highly efficient V22 hearing loop driver is built around high-end technology designed for the flagship V Series PRO hearing loop driver range. It is suitable for driving the most demanding perimeter loop systems in medium to large venues.

  • Page 4: Components

    Components Rubber Feet x 4 2. 2-way 3.5mm Euro-Block Connector x 2 3. 3-way 3.5mm Euro-Block Connectors x3 4. 4-way Terminal Block 5. Hearing Loop Stickers 6. V22 Hearing Loop Driver 7. User Guide 8. IEC Power Lead* 9. Rack Mounting Ears 10.

  • Page 5: Connections

    Connections Power Supply Input 2. Factory Use (no user input) 3. Line Input - 3.5mm Euro-block balanced line input 4. 100V Line Input - 3.5mm Euro-block transformer isolated & balanced 5. MP3 (Line Input)- 3.5mm Euro-block transformer isolated & balanced 6.
  • Page 6 Connection Examples XLR to Euroblock (balanced) Unbalanced to Euroblock Isolated and Balanced...

  • Page 7: Suitable Cable Lengths

    Suitable Cable Lengths The tables in this section show the approximate maximum cable lengths for differing maximum required currents to achieve a 400mA/m field strength. Loop impedance (at 1.6kHz) should be less than voltage capability of the driver (22V) divided by the required current. V22 Single-Turn (Metric) Current Impedance...
  • Page 8 V22 Double-Turn Hearing Loop (Metric) Current Impedance 22.6Ω 11.3Ω 7.53Ω 5.65Ω 4.52Ω 3.77Ω 3.23Ω 2.83Ω 2.51Ω 2.26Ω 2.05Ω 1.88Ω Cable Type Cable Length Max. Round 1.5mm 650.61m 325.31m 216.87m 162.65m 130.12m 108.44m 92.94m 81.33m 72.29m 65.06m 59.15m 54.22m Cable Cable Length (AWG) 2.5mm...

  • Page 9: Driver Area Coverage

    Driver Area Coverage Note: A full site survey of an installation area is recommended for optimal loop design. Areas detailed in the table below are valid only when the following conditions are met: Area is at the maximum current the driver is capable of delivering without voltage clipping at 1.6KHz 2.

  • Page 10: Controls

    Controls Front Panel Overview Clip Status Light - When lit, this status LED indicates the signal on the hearing loop output is clipping (see Troubleshooting on page 25 for appropriate solutions). 2. Open Circuit Loop - Indicates the status of the Loop integrity 3.
  • Page 11 Locking/Unlocking the Hearing Loop Driver The hearing loop driver will power up in Output Current Display Mode and will be locked from entering Adjustment Mode. Unlock the Driver To unlock the hearing loop driver, press the control dial, and when prompted “Unlock driver?”...
  • Page 12 7. Acoustic Delay 8. Backlight Timeout 9. Diagnostics Adjustment Mode Press the control dial in to enter Adjustment Mode; the arrows on the display screen will move to a left and right position. Rotate the dial clockwise or anti-clockwise to make the adjustment. Press the control dial in to confirm the selection and return to the main menu.
  • Page 13 Adjustments In Adjustment Mode, the real-time output current is displayed on the top line in 1A steps. The bottom line indicates the strength of the loop output level adjustment. To alter the loop output level, enter Adjustment Mode: • To increase the loop output level, rotate the control dial clockwise. •...
  • Page 14 Input A/Isolated Input A/Isolated can be adjusted over a range of 47dB. The text on the display indicates if the correct line level has been achieved: • “Low” indicates the line level is too low for the automatic gain control to operate. •...
  • Page 15 • “High” indicates the level is too high and signal clipping may occur. Signal clipping will also be shown by the LED. Adjustments Enter Adjustment Mode and alter input level displayed on the bar until the text displays ‘Good’. It is recommended that at least 5 blocks in the adjustment block are filled.
  • Page 16 High-Frequency Compensation There are 7 levels of high-frequency compensation available to adjust for metal loss. Your hearing loop driver will have high-frequency compensation turned to the lowest setting as its default. Adjustments To alter the high frequency compensation level, enter Adjustment Mode: •...
  • Page 17 Adjustments Rotating the control dial clockwise or anti-clockwise in Adjustment Mode to toggle between the 150Hz and 180Hz cut-off or turn the filter off. Press the to dial once to confirm the selection and return to the main menu. Acoustic Delay 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.
  • Page 18 Diagnostics This screen displays the connected loop’s resistance (R ohms) and loop Inductance (L uH). Rotating the control dial clockwise displays the internal heatsink temperature and fan PWM (100% is fan full speed): Rotating the control dial clockwise again displays the internal power supply voltages: Rotating the control dial clockwise again displays the UID unique identification for the driver.

  • Page 19: Hearing Loop Setup

    Step 5: Final Output Level Adjustment (see page 24) Step 6: Input Signal Level Adjustment (see page 24) Required for Setup • TSG - Contacta Test Signal Generator (TSG1) • FSM - Contacta Field Strength Meter (IL-CONTACTA-FSM) • Tripod or similar for mounting the FSM is recommended •...
  • Page 20 Step 1: Background Noise Level This test should be performed prior to loop installation. Set up the FSM, ensuring that the two vertical arrows in the top-right corner of the device are placed at the correct height: • 3’ 9” for seated user. •...
  • Page 21 3. Set the TSG to the 1kHz setting. 4. Set the FSM to the Third Octave F= 1000Hz setting. 5. Adjust the line level until “Good” is displayed. 6. Adjust the drive level to achieve 2 amps of output current. Set the TSG to the pink noise setting and record the value measured by the FSM.
  • Page 22 loop design or more powerful driver is required. This is potentially due to metal loss. 5. Briefly alter the current to the desired level. For instance, the example in step 4 requires 4 amps of current. 6. The field strength will now be 0dB +/- 1dB. Quickly record the current required to achieve 0dB field strength.
  • Page 23 2. Reduce the loop output current to 2 amps. Set the FSM to the RMS/Peak A-Weighted mode and record the value measured by the FSM in the centre of the loop. Move the FSM to other positions within the looped area and record the values measured by the FSM.
  • Page 24 Note 1: When adjusting the output current, if a level of 6 amps is reached and yet the field strength is still below -6dB, the correct field strength will not be achieved. This is caused by either an incorrect loop design or installation, more metal loss than expected or an incorrectly specified driver.

  • Page 25: Troubleshooting

    2) Use a larger diameter cable. 3) Create a two-turn loop and reduce the current output. 4) Use a higher voltage driver. Please contact your distributor (or Contacta if appropriate) if you are experiencing technical difficulties with the product.

  • Page 26: Warning / Error Messages

    The mains power should be recycled or a reboot initiated. If the warning still appears, discconect the power supply and contact your distributor (or Contacta if appropriate). Aux PSU Fault This message indicates an error with the auxillary power supply.
  • Page 27 This message indicates that the loop connected has characteristics that are not expected with typical loops. The mains power should be removed or the unit rebooted. Then, check the loop and feeder cables. Contact your distributor (or Contacta if appropriate) if the error persists. Loop Fault This indicates the driver has detected a general fault with the output.

  • Page 28: Technical Specifications

    Technical Specification Power Voltage: 100V-120V /200V-240V AC (Universal auto switching) Frequency: 50Hz-60Hz Power: 175W Connection: IEC Inputs 1 X Input A 3.5mm Euro-block [optimized for -10dBV to 0dBv] 1 X 100V Line Input (Transformer isolated) 3.5mm Euro-block 1 X Line Input (Transformer isolated) 3.5mm Euro-block 1 X Input B Line/Microphone (12V phantom power via 680Ω) [optimized for levels above -45dBv to -10dBv] 3.5mm Euro-block Output Characteristics...
  • Page 32 Local dealer: Contacta, Inc. (616) 392 3400 support@contactainc.com www.contactainc.com...

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V22

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