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875Z REAR PANEL CONNECTORS & SWITCHES
The following is a description of the rear panel switches for the 875 Zone Amplifier and their function. There are 8 x 75
watt amplifiers in the 875B Zone amp. The channels are split into 4 zones each with 2 channels. Each zone will operate
in stereo or the channel outputs may be connected in series to achieve a mono channel of 250 watts. Both channels in
each zone have 4 input options
1) ODD NUMBERED CHANNEL INPUT SELECTORS
This four position slide switch selects input signals for this channel and, in SERIES (bridged) mode, it is the sole
input used for the combined channel 1+2, 3+4, 5+6 or 7+8 amplifier channel.
1 st position (top):
P
2 nd position:
P
3 rd position:
P
4 th position (bottom):
P
EVEN NUMBERED CHANNEL INPUT SELECTOR:
Similar to above INPUT SELECTOR SWITCH but only controls the input to channel 2, 4, 6 or 8 when the pair of
adjacent channels is in STEREO mode. In SERIES mode this switch has no effect.
2) STEREO BUS INPUTS:
2 daisy-chained RCA connectors for the left (white) bus input and two daisy-chained RCA connectors for right (red)
bus input. Sensitivity is 875 mV for an ouptput of 75 watts into 8 ohms.
3) STEREO/SERIES SWITCH:
Controls the two channels in this zone.
STEREO (top position):
P
SERIES (bottom position):
P
4) CHANNEL DIRECT INPUT CONNECTORS:
Sensitivity: 875mV for an output of 75watts into 8ohms
5) CHANNEL LEVEL CONTROL:
Normal or maximum is fully clockwise. Minimum is fully counter clockwise which fully attenuates the input signal.
6) SPEAKER BINDING POST CONNECTORS:
STEREO mode:
P
SERIES mode:
P
7) MUTE OPTIONS SWITCH:
ON (Left position):
P
SIG (Centre position):
P
EXT (Right position):
P
left stereo bus
right stereo bus
sum of left and right stereo bus (mono of stereo bus)
direct input from RCA jack. (.875 v = 75watts/8ohms)
individual channels
bridged mode wherein channels 1+2 (using only Ch1 input), or channels 3+4
(using only Ch3 input) or channels 5+6 (using only Ch5 input) or channels 7+8
(using only Ch7 input) are combined into a single, higher power channels.
Sensitivity in SERIES mode = 1.8v input at 250 watts output into 8ohms
Use the red terminal to feed the + red terminal on the loudspeaker.
Use the black terminal to feed the - black terminal on the loudspeaker
Use the Ch1 red terminal to feed the + red terminal on the loudspeaker and Use the
Ch2 red terminal to feed the - black terminal on the loudspeaker
Each zone has individual muting options.
Zone will remain on as long as power is on in the amplifier.
Mutes the Zone when the signal is absent for more than 8 minutes.
Zone will mute when 12v is present at the External Zone Mute connector (9).
875Z -
EIGHT CHANNEL POWER AMPLIFIER
(Channels 1, 3, 5 or 7):
3
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