Hearing Loop Setup 22-27 Troubleshooting Technical Specifications 29-31 Standards 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 colours are subject to change without notice.
Product Overview Our highly efficient and compact V7, V14 and V15a hearing loop drivers are suitable for smaller facilities and venues. The V7 and V14 are constant current hearing loop drivers which power hearing loops utilising a single output. The V15a is a constant current dual output hearing loop driver with integral phase shifter for phased array configuration.
- 3.81mm Euro-block balanced line input/feedthrough. 3. Line Input 2 - XLR balanced line input/feedthrough. Power Supply Input - *V7 DC Power Input, 2.1mm 14Vdc 2.14A ***V14 DC Power Input, 2.1mm 24Vdc 4.17A **V15a DC Power Input, 2.1mm 24Vdc 4.17A Caution: Use only the provided Power Supply.
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Connection Examples XLR to XLR (line) TRS to XLR (line) Unbalanced to XLR XLR to Euroblock (balanced) Unbalanced to Euroblock...
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 (V7: 7.5Vrms, V14: 14Vrms, V15a: 15Vrms) divided by the required current. This achieves 400mA/m field strength at 1kHz.
The meanings of these indications are as follows: Indicator Meaning Remedy Hearing loop(s) is/are correctly None required. V7 and V14: connected to the driver. Loop Good V15a: Loop A Good Loop B Good Hearing loop(s) is/are improperly...
Controls Front Panel Overview V7 and V14 Clip Status Light - When lit, this status LED indicates the signal on the hearing loop output is clipping (see Troubleshooting on page 28 for appropriate solutions). 2. Display Screen - Indicates the status of the Loop Output, displays menu and adjustment options.
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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?”...
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The menu options are as follows: V15a V7 and V14 Loop Output Loop Output 2. Line Input 2.
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The hearing loop driver’s Loop Output section displays the real-time output current in 0.5A steps. Adjustments V7 and V14 Loop Output: Adjustment Mode V15a Loop Output: Adjustment Mode In Adjustment Mode, the real-time output current is displayed on the top line in 0.5A steps. The bottom line indicates the strength of the loop output level adjustment.
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Line Input The hearing loop driver’s Line Input section displays the line input level within 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.
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Phantom Power Phantom power for a connected microphone is set off as the default setting. Adjustments Rotating the control dial clockwise or anti-clockwise in Adjustment Mode will toggle the phantom power on or off. Press the control dial once to confirm the selection and return to the main menu.
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Microphone Input The hearing loop driver’s Microphone Input section displays the microphone input level within a range of 47dB. The top line of the display indicates if the correct microphone input level has been achieved: • “Low” indicates the microphone level is too low for the automatic gain control to operate.
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Loop B’s output to be adjusted relative to Loop A’s output. Please note: This section is only available on the V15a. The equivalent V7 and V14 menu displays Current Output, to which adjustments can be made using the Loop Output section (see page 16).
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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: •...
Set-Up To ensure optimal performance of a V7, V14 or V15a hearing loop driver, set-up should be performed in following order: Step 1: Background Noise Level (see page 23) Step 2: Metal Loss (see pages 24-25) Step 3: Output Level and Clipping (see page 24-25)
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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: • 1.2 metres (3’ 9”) for seated user. •...
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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.
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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.
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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 user positions within the looped area and record the values measured by the FSM.
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Note 1: When adjusting the output current, if a level of 2.5 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.
1) Reduce the length of the are lit. too long. loop. 2) Use a larger diameter cable. 3) Create a two-turn loop. 4) Use a higher voltage driver. Please contact your distributor (or Contacta if appropriate) if you are experiencing technical difficulties with the product.
Technical Specification Power 2.1mm 30W 14Vdc 2.14A via External PSU (PS-55) Class 6 External PSU (100V -240V AC 50Hz-60Hz) Inputs 1 X Line XLR or 3.81mm Euro-block [optimised for -10dBV to 0dBv] 1 X Microphone (12V phantom power via 680Ω) [optimised for levels above -45dBv] Output Characteristics see notes 1 and 2 Output Voltage:...
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Technical Specification V14: Power 2.1mm 100W 24Vdc 4.17A via External PSU (PS-60) Class 6 External PSU (100V -240V AC 50Hz-60Hz) Inputs 1 X Line XLR or 3.81mm Euro-block [optimised for -10dBV to 0dBv] 1 X Microphone (12V phantom power via 680Ω) [optimised for levels above -45dBv] Output Characteristics see notes 1 and 2 Output Voltage:...
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Technical Specification V15a: Power 2.1mm 100W 24Vdc 4.17A via External PSU (PS-60) Class 6 External PSU (100V -240V AC 50Hz-60Hz) Inputs 1 X Line XLR or 3.81mm Euro-block [optimised for -10dBV to 0dBv] 1 X Microphone (12V phantom power via 680Ω) [optimised for levels above -45dBv] Output Characteristics see notes 1 and 2 Output Voltage:...
(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.
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Local dealer: UK & ROW US & Canada +44 (0) 1732 223900 +1 616 392 3400 sales@contacta.co.uk info@contactainc.com Contacta Systems Ltd. Office 13, Dana Trading Estate Transfesa Road Paddock Wood, Tonbridge TN12 6UT www.contacta.co.uk...
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