Installation guide

VAR4 / VAR12 / VAR20 - Product Description
Audio Signal Processing
Input
Sensitivity and impedance
Line ..........................................................................................................−20 dBu (77 mV) @ Z ≥10 kΩ
Mic ...........................................................................................................................770 µV @ Z ≥10 kΩ
Music (phono) ........................................................................................ Suits 1-2 V RMS units Z ≥5 kΩ
Equalisation ...................................................................................................................... 3 band plus LF Cut
Input overload margin............................................................................................................................ 40 dB
Input attenuator range ..................................................................................................................... 0 – 63 dB
Phantom power ............................................................................................................................... ≥12 V DC
Surveillance tone ........................................................................................................................... 20 – 30 Hz
Required level 0 to −40 dBFS
Chime generation .......................................................................................................None / 1 / 2 / 3 Chimes
Output
Gain control range ...................................................................................................................0 dB to −63 dB
Graphic equalisation.............................................................................................................................8 band
±12 dB @ 125, 250, 500, 1 k, 2 k, 4 k, 8 k, 16 kHz
Level and impedance ........................................................................................................ 0 dBu @ Z=660 Ω
Hard limiter threshold ....................................................................................................................... +2.5 dBu
Surveillance tone .................................................................................................... 10 dBu to −30 dBu 30 Hz
Pulsed mode=1 s on 20 s off
Number of induction loop driven
VAR4.............................................................................................................................................up to 2
VAR12...........................................................................................................................................up to 4
VAR20...........................................................................................................................................up to 6
General
Test tones............................................................... Speech Shaped / White Noise / Pink Noise /Sine Wave
Gain control ......................................................................................Input / Output / External volume control
Ambient noise sensing ........................................................................... Programmable output level control
Night volume control............................................................ Daily time controlled input / Output level control
Gain control range ...................................................................................................................0 dB to −63 dB
THD input to output ................................................................................................................ <0.1% @1 kHz
Crosstalk................................................................................................................................ >70 dB @1 kHz
Residual noise ............................................................................................................................. <78 dBu (A)
S/N line .......................................................................................................................................... >70 dB (A)
S/N mic .......................................................................................................................................... >60 dB (A)
Frequency response (input to output) ...................................................................... 100 Hz to 20 kHz −3 dB
Analogue Contact Thresholds
Status
Faulty: Open Circuit.............................................................................................................................. >3.7 V
Healthy: Inactive .........................................................................................................................2.5 V – 3.7 V
Indeterminate..............................................................................................................................0.8 V – 2.5 V
Healthy: Active............................................................................................................................0.3 V – 0.8 V
Faulty: Short Circuit .............................................................................................................................. <0.3 V
Issue: 03 complete, approved
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