Clear-Com EF-701M - Manual (Page 28)

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LEVELS
EF-701M front-panel controls affect the following “listen levels”: the sidetone and
volume at the users’ stations or beltpacks; the receive level of the local EF-701M; and the
send level of the remote EF-701M.
Adjust the PL send and receive levels as appropriate for the external PL system and
listening conditions. The controls will typically be between 10 o’clock and 2 o’clock,
roughly in the 0 dBu range at the 4-wire interface. If different intercom brands are used
on opposite ends of a pair of EF-701M units (RTS and Clear-Com for example), the
controls may need to be adjusted outside of the normal range. Otherwise, more extreme
settings could indicate a problem elsewhere in the system.
Level settings will differ slightly if the EF-701M is used with RTS-TW intercoms, as the
nominal audio levels for that system are slightly higher than Clear-Com or compatible
systems (about 4-8 dB). RTS and Clear-Com may be freely mixed on a channel,
including call signaling, though the maximum number of EF-701M units able to share a
channel may be reduced. RTS levels and call signals are selected by jumpering together
pins 8 and 15 of the DB-15 connector or by setting mode-switch 2 to ON.