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Bus Input/Output: The bus line input is an optional
input that can be used to connect a single source
to multiple zones. The bus line output is a passive
passthrough of the bus input and can be used to
daisy chain the source to other amplifiers in the
system.
Line Input: The line audio input for each zone is a
dedicated sensing input that will activate the zone
when an audio signal from a source is present.
Line/Bus Switch: Sets the zone input to the Line
Input or the Bus Input.
Speaker Outputs: The A and B speaker outputs
are in parallel to the zone amplifier output. The mini-
mum speaker impedance for stereo mode opera-
tion is 4 ohms for one pair and 8 ohms for two
pairs of speakers. The minimum impedance for
bridged mode operation is 8 ohms, Speaker B only.
Gain Controls: Left and Right gain controls inde-
pendently adjust the sound level for each channel.
When used in the bridged mode only the Left con-
trol is used.
Power Switch: Turns the amplifier on/off. This
switch does not disconnect the main power feed
from the amplifier; this requires that the power cord
be unplugged from the outlet.
Fuse Receptacle: Holds a replaceable fuse for AC
power input connection. Fuse rating for North
America is T10AL 250V and for Europe is T7AL
250V.
AC Input: The AC voltage input for the North
American model is 120VAC at 60Hz (European
model, 230VAC at 50Hz). This receptacle accepts
a 3-prong IEC 320 type connector. A detachable 3-
terminal power cord is included.
12VDC Trigger In/Out: The 12V Trigger In is
used to activate the zone. The Trigger Out provides
100mA 12V max. This can be used to drive other
12V triggered devices. The delay and audio sensing
are bypassed when the 12V trigger input is used.
Delay Time: Muting delay can be adjusted from
about 0.5 minute to 4.5 minutes. When an audio
signal is not present, the amplifier will automatically
go into standby mode after the preset period of
time. When set to maximum, the amplifier will stay
active and not go into standby.
Stereo/Bridge Mono Switch: Sets each zone
amplifier for stereo or bridged mono operation.
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R850MC AMPLIFIER