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Installation
6
2. On the SSA-424A front panel, set the 4W LEVEL REF
SEL switches to the position which most closely matches
the audio input and output levels of your 4-wire system.
If you don’t know the levels, select the +8 dB position for
now.
2-Wire Audio Connections
RTS TW Audio Connections
1. Use standard TW intercom cables. Standard TW system
cables can carry either one or two channels, while each
hybrid in the SSA-424A can only interface one TW
channel to one 4-wire channel, which channel is
determined by the front panel 2W CHAN SEL switch. If
your TW system cable is only carrying one channel, or if
you only need to connect one of two channels, connect
directly to J1A (System A) or J1B (System B). If your
TW system cable is carrying two channels, and you want
to connect to both, use a TW-5W or similar device as
shown in Figure 3 on page 7.
Pin 5 Balanced Audio - 4-wire input
Pin 6 No Connection
FIGURE 2. Rack Mount Configurations