Contacta PRO Series Operation manual

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March 2020
V22a / V34 / V34a

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Contents
Product Overview
Components
Connections
Using the System
Inputs Menu
Guided Loop Setup
Manual Loop Setup
Remote Monitoring
Diagnostics
Service
Save/Load Settings
System Updates
Troubleshooting
Notication Guide
Technical Specication
Standards
3
4-5
6-7
8-12
11
13-18
19-21
22
23-24
25
26
27-29
30
31
32-34
35
Contacta has a policy of continuous product development, therefore small specication changes
may not be reected in this manual. Images, labels, packaging, accessories and product colours
are subject to change without notice.

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Product Overview
Our highly eicient 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 utilising a single output. The V22a and V34a are dual output,
high current hearing loop drivers with integral phase shifters for
phased array congurations. These drivers have a Class-D amplier
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
Contacta’s Large Area Hearing Loop Installation Guide.

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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*
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*
V22a
V34
5
6
4
8
7
1
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*Plug type varies by country.
5
6
4
8
7
1
2
3

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*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.
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*
V34a
5
6
4
8
7
1
23

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1. Power Supply Input - The primary method of isolating the amplier
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.
Rear Panel Connections
Connections
1 2 3 4
5 6 7 8

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Connection Examples
XLR to XLR (line)
TRS to XLR (line)
Unbalanced to XLR
XLR to Euroblock (balanced)
Unbalanced to Euroblock
2-CONDUCTOR SHIELDED CABLE
2-CONDUCTOR SHIELDED CABLE
2-CONDUCTOR SHIELDED CABLE
2-CONDUCTOR SHIELDED CABLE
2-CONDUCTOR SHIELDED CABLE

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If the ‘ATTN’ (Loop Attenuation) symbol ( ) 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.
Using the System
Startup
V Series PRO drivers perform a series of tests when powered on. The
Contacta 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 ( ) along with an error message:
1. Open Circuit [Primary/Secondary Loop]: See Connections on page
6 or consult the Contacta 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
6 or consult the Contacta 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
!
ATTN

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Front Panel Overview
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 conrm 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
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 rst 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.

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Main Menu
After being unlocked, the hearing loop driver will display the main
menu.

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Selecting Inputs from the main menu opens the following screen:
• 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 lter 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:
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 27 for Notication Guide).
3. Once you have made a selection on the Phantom Power screen,
the driver will display the following screen:
Inputs

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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:
• 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 ash 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:
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.

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Guided Loop Setup
Guided Loop Setup ensures that hearing loops achieve optimum eld
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 6).
Begin the Guided Loop Setup by selecting it from the driver’s main
menu, and when prompted select “Yes” from the following screen:
• FSM - Contacta Field Strength Meter (IL-CONTACTA-FSM)
• Tripod or similar for mounting the FSM is recommended
Required for Setup
*This is dependant on correct loop design and metal loss.
Note: For large area hearing loop cable installation instructions,
consult Contacta’s Large Area Hearing Loop Installation Guide.
Begin the Setup

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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:
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”:
3. Note the hearing loop’s eld strength at 100Hz, 1KHz, and 5KHz
using the Contacta Field Strength Meter (IL-CONTACTA-FSM) set at
the 3rd octave band pass setting.
Once completed, select “Continue” on the display to turn o the
signal.
4. Enter the three levels into the hearing loop driver. The “Backspace”
button will become a “Continue” button when the correct number
of digits have been entered for each value:
5. When the three levels have been entered, one of following options
will be displayed (see next page):

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5a. If the values at 100Hz and 5KHz are within +/-3db of the value
measured at 1KHz, this section is complete. Select “Continue”:
5b. If the driver has calculated that High Frequency Compensation
is required, it will ask whether to apply this correction. Selecting
“Yes” is recommended.
5c. If the driver cannot provide ideal High Frequency Compensation,
it will ask whether to apply the maximum adjustment available.
Selecting “Yes” is recommended.
Stage 2: Loop Drive
1. Select “Yes” when prompted by the following screen:
The driver will begin outputting a 1KHz sinewave signal at a low
level (2Arms) to allow accurate setup.

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2. The following screen will be displayed, with a symbol on the top
right indicating “Signal On”:
3. Note the hearing loop’s eld strength at 1KHz using the Contacta
Field Strength Meter (IL-CONTACTA-FSM) set at the 3rd octave
band pass setting. Once this value has been noted, select
“Continue” on the display to turn o the signal.
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”:
5b. If the driver cannot deliver the current required to achieve 0dB it
will display the following screen:
Select “Yes” when asked to apply the maximum unclipped current.

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3. Record eld strength at various locations in the hearing loop using
the Contacta FSM set 1KHz 3rd octave band pass setting. These
details will be required in Compliance Certicate documents. Then,
select “Continue”.
Select “Continue”. The driver will make adjustments to achieve the
strongest maximum eld stength possible.
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:
Stage 3: Loop Uniformity
1. Select “Yes” when prompted by the following screen:
The driver will begin outputting a 1Arms at 1KHz sinewave signal
at a level below the calculated current required to hit 0dB eld
strength.
2. The following screen will be displayed, with a symbol on the top
right indicating “Signal On”:

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Stage 4: Completion
1. Select “Yes” when prompted by the following screen to complete
the Guided Loop Setup to save settings:

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Manual Loop Setup
Begin Manual Loop Setup by selecting this option from the driver’s
main menu.
Note: For large area hearing loop cable installation instructions,
consult Contacta’s Large Area Hearing Loop Installation Guide.
Stage 1: High Frequency Compensation
High Frequency Compensation is required when metal in the
surrounding environment impacts the hearing loop’s signal quality.
1. Select “Yes” when prompted by the following screen:
2. The driver will begin outputting a pink noise signal to allow
accurate setup. Once a green ‘Signal On’ symbol is displayed on
the right, select “Continue”.
3. The following screen will be displayed:
4. The strength of High Frequency Compensation can then be
adjusted from 1 (weak) to 7 (strong). Once the appropriate strength
has been set, select “Continue”.

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Stage 2: Loop Drive
1. Turn on the driver’s internal 1KHz test signal generator by selecting
“On” from the following screen. Once a green ‘Signal On’ symbol
is displayed on the right, select “Continue”.
Note: An external sine signal source can be connected if required.
2. Selecting the left dB circle allows the drive level to be adjusted in
1dB steps from -24dB to 0dB. The real-time measured current is
displayed in the right hand circle once a signal is present.
If the hearings loop(s) connected to the driver are of suitable
characteristics and installed correctly, the display screen will list
the available current for the V34 and V34a as 14Arms and the V22a
as 8Arms.
If the driver detects that the loop(s) connected do not have
suitable characteristics to deliver the maximum 12Arms, the
available current for the driver will be attenuated to prevent
clipping (orange ‘ATTN’ symbol will be visible with the maximum
available current below it).
The right hand circle will display where the loop has been
attenuated to as grey bars.