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875Z - EIGHT CHANNEL POWER AMPLIFIER
1
INTR
ODUCTION
Thank you for choosing the 875 Eight Channel Power Amplifier. Bryston welcomes any suggestions you may have, or
comments regarding the operation of your amplifier. We consider you, our customer, to be Bryston’s most important
resource, and your opinion is very much appreciated.
DESCRIPTION
The 875 series is a modular multi-channel audio power amplifier design of 8 x 75 Watts per channel. Currently the 875 is
available in two different versions.
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875HT: A Home Theatre version, the “HT” is essentially 4 stereo amplifiers. Each stereo pair selects from bal
anced or single ended inputs. Each stereo pair may be bridged. The gain of the balanced input is 23dB
and the single ended input is 29dB.
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875Z: A Home Install version, the “Z” has 4 stereo amplifiers separated into 4 zones that can be independently
muted or respond to program sense circuitry. Each channel can select from a discrete input, or from a
common stereo input when distribution is wanted. The inputs are single ended with a gain of 29dB. Each
stereo pair may be bridged.
The power up sequence of either 875 model may be controlled from a 12v control voltage. The 875 uses ‘soft start’ power
control circuitry to eliminate high inrush currents when A/C power is applied.
WARRANTY (see back page for details )
SHIPPING BO
X & PACKING MATERIAL
Please keep the original shipping box and all packing material. This will ensure the amplifier is protected in future trans-
port. In the unlikely event you have a problem and must return it for service you must use the proper packing material.
Ship the amplifier only in the original packing material, as the unit is not insurable by carriers otherwise.
INSTALLATION
The most important installation consideration is ventilation. The 875 series amplifiers are a convection-cooled.
Unrestricted air-flow across its heat sinks is a must. For this reason do not install anything directly above it. Allow 3.5” (2u)
to 5” (3u) inches of space above and to the sides of this amplifier. Do not install directly above other heat generating equip-
ment. Should your installation conditions be constricted, then additional forced air-cooling may be necessary. Any 875
channels thermally shutting down during operation indicates insufficient cooling, and a remedy must be found for cooling
the amplifier. Provide a minimum 6” space to the rear of the 875 for ventilation and dressing cables to and from the ampli-
fier.
Never operate the
875 in a vertical position.
WIRING THE 875Z (also see rear panel description )
Speaker wires should be as short as practical. Use quality wire, and if runs are more than 3 meters use at least 12 gauge
wire. The speaker binding posts will accept wire up to 3 gauge in size. Bryston can custom build cables for your applica-
tion.
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A/C power:
Before plugging in the power cord be sure your 875 is specified for the correct A/C voltage for your locality. The
voltage is listed by the power input connector. Never lift the safety ground to the amplifier or remove the ground pin
from the plug.
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Power line conditioners:
The 875’s performance will not improve with the use of power line conditioners. In fact most of the time they restrict
the flow of current in the power line to the amplifier thereby reducing performance at high output levels.