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875Z - EIGHT CHANNEL POWER AMPLIFIER
3
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
(Channels 1, 3, 5 or 7):
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.
P
1
st
position (top): left stereo bus
P
2
nd
position: right stereo bus
P
3
rd
position: sum of left and right stereo bus (mono of stereo bus)
P
4
th
position (bottom): direct input from RCA jack. (.875 v = 75watts/8ohms)
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.
P
STEREO (top position): individual channels
P
SERIES (bottom position): 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
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 CONNECT
ORS:
P
STEREO mode: Use the red terminal to feed the + red terminal on the loudspeaker.
Use the black terminal to feed the - black terminal on the loudspeaker
P
SERIES mode: 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
7) MUTE OPTIONS SWITCH
: Each zone has individual muting options.
P
ON (Left position): Zone will remain on as long as power is on in the amplifier.
P
SIG (Centre position): Mutes the Zone when the signal is absent for more than 8 minutes.
P
EXT (Right position): Zone will mute when 12v is present at the External Zone Mute connector (9).