5
Russound R850MC Installation Manual
Rev. 3
bACk PANEl FEATURES
Power LED
On start-up, the first LED lights red to show power on. When the first zone is
turned on, the LED lights green.
Zone LED
On start-up, zone LEDs are off (except Zone 1). When each zone powers on,
the corresponding LED lights green. When at least one zone is on, the rest
of the zone LEDs are red to show they are in standby mode. If a short circuit
happens on the speaker outputs, the LED will light amber.
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
minimum speaker impedance for stereo mode operation 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 independently adjust the sound level for each
channel. When used in the bridged mode only the Left control 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 T5AL 250V.
AC Input / Voltage Switch
Voltage is set with a selectable switch for 110V or 240V operation. 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.
Standby Mode
The amplifier will go into Standby mode when no audio signal or trigger is
present, and after the minimum delay time has timed out. The amplifier will go
into a 0.5 Watt or less standby power mode.
Stereo/Bridge Mono Switch
Sets each zone amplifier for stereo or bridged mono operation.
