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875HT EIGHT CHANNEL POWER AMPLIFIER
3
875HT REAR PANEL INPUT/OUTPUT CONNECTIONS
11
Single Ended Input Connectors
This input connector for single-ended or un-balanced signals accepts standard ‘RCA’ or
‘Phono’ connectors.
22
Balanced Input connector.
This input connector accepts standard 3 pin ‘XLR’ male connectors.
Pin 1 is signal ground
Pin 2 is positive phase (+) signal
Pin 3 is negative phase (-) signal
33
Input Select Switch.
Each 875-HT channel gives the user the option of switching between either balanced input or single ended input.
44
Input Level Control
Normal or maximum is fully clockwise. Minimum is fully
counter clockwise which fully attenuates the input signal.
55
STEREO/MONO SWITCH
The 875HT is configured as 4 stereo amplifiers. Each stereo pair has a Mono/Stereo switch. Stereo configures the chan
nels as independent amplifiers with their own dedicated inputs. Mono configures the stereo pair as a single mono
amplifier. The input comes only from the Mono labeled input and the speaker output connections are between the
two hot (red) binding posts.
66
OUTPUT BINDING POSTS
In STEREO mode: the RED binding post is connected
to the amplifier output. Connect to this post the (+) ter
minal on the loudspeaker. The BLACK binding post is
connected to signal ground. Connect to this post the (-)
terminal on the loud speaker.
In MONO mode: both the RED binding posts are
connected to amplifier outputs. The Odd Numbered
channels (1, 3, 5 or 7) are the positive (+) phase output
and the even numbered channels are the negative (-)
phase output
The Output binding posts provide three different inter
connect options. Combinations may be used when bi-
wiring. See figure below. Cables should be kept as short
as practical and should never be terminated with con
nectors that may become confused for AC power con
nectors. Cables should be dressed away from input and
power cables.
max.
min.
LEVEL CONTROL
LEVEL CONTROL
BALANCED vs SINGLE ENDED INPUTS
The balanced input requires a balanced pre-amp source. Balanced systems provide noise protection from external
electrical interference, so cable length can be very long (50m or longer ). The single ended or unbalanced input is
provided for pre-amps without balanced output. Single-ended cables should be kept to 20’ (7m) or less. In general
never use longer cables than necessary, never coil excess cable length, and run signal wires away from AC power
or speaker cables. Whether using balanced or un-balanced cables, use quality, 100% shielded cables with gold
plated connectors.
Input Sensitivity:
P
Single-ended inputs: 850mV input for an output of 75W into 8 ohms
P
Balanced inputs: 1.7V input for an output of 75W into 8 ohms