Bryston D65Z Owner's Manual page 4

D65Z  D130Z  D250Z 
8 CHANNEL POWER AMPLIFIERS
INTRODUCTION
Thank you for choosing the D65/130/250Z 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 impor-
tant resource, and your opinion is very much appreciated.
DESCRIPTION
The D65/130/250Z are modular multi-channel audio power amplifiers of 65, 130 or 250 Watts/channel into 4Ω. While
each of the eight channels in the D65/130/250Z can operate completely independently, with its own input, output and level
control, each channel is also assigned to one of 4 Zones. Each Zone is comprised of two adjacent channels and each
zone can be remotely muted independently of the other zones. Each channel can select from its own discrete input (RCA
or phono jack) or from a common stereo input (stereo bus inputs, also RCA or phono jacks). The inputs are single ended
with a gain of 29dB.
The power up sequence of the D65/130/250Z may be controlled from a 4 to 12v (AC or DC) control voltage. The
D65/130/250Z uses 'soft start' power control circuitry to eliminate high inrush currents when A/C power is applied.
SHIPPING BOX & PACKING MATERIAL
Please keep the original shipping box and all packing material. This will ensure the amplifier is protected in future transport.
In the unlikely event you have a problem and must return it for service you must use the proper packing material as your
unit may not be insurable the carrier if it is not shipped in the original packing material.
INSTALLATION & VENTILATION
The most important installation consideration is ventilation. The D65/130/250Z amplifiers are onvection cooled.
Unrestricted air-flow across its heat sinks is a must. For this reason do not install anything directly above it. Allow at least
3.5" inches (2u) of space above, 1.75 inches (1u) of space below and at least 1 inch to either side of this amplifier. Do
not install directly above other heat generating equipment. If installed in a cabinet it should have an open front and back.
Should your installation conditions be constricted, then additional forced air-cooling may be necessary. Any D65/130/250Z
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 D65/130/250Z for ventilation and dressing cables to and from
the amplifier.
Never operate the in a vertical position.
D65/130/250Z
WIRING THE D65/130/250Z
(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 application.
AC POWER
Before plugging in the power cord be sure your D65/130/250Z 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.
AC POWER CONDITIONERS
Bryston urges caution in choosing a power conditioner for your audio/video system. Large power amplifiers can draw very
substantial current from the wall plug, and many so-called power conditioners can in fact hinder the supply of current by
inserting resistances in series with the line cord. However, there are now power conditioners that can reduce or eliminate
RF and 'hash' from the AC supply and may actually improve current delivery to your system. This type of power conditioner
(exemplified by Bryston B•I•T Power Conditioners) uses the energy storage in a large toroidal tranformer to provide high
instantaneous power and reduce the substantial AC output resistance of the wall socket and house wiring. This resistance
can be in the range of 0.5 to 1 Ohm and is typically reduced to only a few milliOhms by the Power Conditioner. That in turn
considerably reduces Voltage drop in the power line on high current surges and quite substantially increases the stability
of the power line improving audio (and video) focus, precision and clarity.