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5
Note: Failure to ground the AV-V70 enclosure or to tighten screws associated with PCB boards will defeat
the protection circuitry designed to protect the modules/cards from damage due to lightning and static
electricity.
4
25Vrms “Host” Speaker Circuit Wiring
The AV-V70 includes one 70Vrms Speaker Circuit Interface Card prewired to an installed Audio Converter
Transformer and LED Indicator Card. Whether the “Host” speaker circuit is wired Class A or B, run the existing
25Vrms (40 Watt maximum) speaker circuit wiring to the 25V Audio Input terminals (B+, B-) of the 70Vrms Speaker
Circuit Interface Card. If the “Host” speaker circuit is wired Class B, install the “Host” panel’s speaker circuit end-of-
line (EOL) resistor across the 25V Audio Input terminals A- and A+ of the 70Vrms Speaker Circuit Interface Card
(see figure 4). If the “Host” speaker circuit is wired Class A, instead of placing the “Host” panels speaker circuit end-
of-line (EOL) across the A- and A+ terminals, connect the return “Host” panel’s Class A speaker circuit wiring to
these terminals (see figure 5).
9"
11 7/8"
1 1/8"
4 1/2”
10 3/4"
4 1/4”
7 3/4”
3"
Grounding Screw
Figure 3 – AV-V70 Enclosure Dimensions and Mounting
