Meridian Audio 558 - Manual (Page 14)

Setting up the multi channel power amplifier
9
Standby
Once set up, the multi channel power amplifier can be left in
standby as it consumes negligible power in this mode.
To bring the amplifier out of standby press the button on the
front panel. Alternatively, the 558 can be brought out of standby
automatically using the TRIGGER INPUT; see below.
If you are not going to use the multi channel power amplifier for
a period of several days you should switch the unit completely
off, at the back panel, and disconnect it from the AC power
supply.
Trigger input
The TRIGGER INPUT can be used to bring the multi channel
power amplifier out of standby by applying a signal from a
control unit.
The trigger input should be an AC or DC signal of between 5 and
30V. Suitable trigger signals are provided by the Meridian 561,
562, 568, 800, or 861.