Bryston 9B ST User Manual

BRYSTON

OWNER’S MANUAL

Instructions For Bryston

ST Series Amplifiers

Model 9B ST

GENERAL INSTRUCTIONS

Warranty Information:

Thank you for choosing a Bryston product. We
welcome any suggestions you may have, or

comments regarding the operation of your am
plifier. We consider you, our customer, to be
Bryston’s most important resource, and your
opinion is very much appreciated.

Bryston products are warranted to be free from
manufacturing defects for a minimum of 20,
(twenty), years from the original date of manu
facture. This includes all parts, labor and one
way return shipping. This warranty covers the
original owner and any subsequent owners. The
warranty is retroactive for any Bryston product
purchased within the last twenty years. Tamper

Bryston 9B-ST Amplifier Description:

The Bryston 9B-ST is a multi-channel power
amplifier consisting of five independent ampli
fier modules, each with its own power trans
former and +/-60V power supply. Each audio
channel provides connections for balanced or

ing by anyone other than factory authorized
personnel voids the warranty. Warranty service
may be obtained by returning the unit to any
authorized Bryston dealer or distributor. You
may also contact the Bryston factory or national
service offices directly at the location listed on
the rear page of this manual.

Please keep the original box and all packing
material. This will ensure the amplifier is pro
tected in the unlikely event you have a problem
and must return it for service. No warranty card
is necessary to initiate your coverage. Please
refer to the back page for more detailed war
ranty information.

single ended input and will supply a minimum
of 120 watts of power into 8 ohms or 200
watts into 4 ohms.
A remote power control option is available on
THX versions.

Installation Setup And Recommendations:

PROVIDE ADEQUATE VENTILATION
Do not place the amplifier in an enclosed un
ventilated area. Allow at a minimum, 3 inches of
space at the top, sides and back as your ampli
fier relies on convection cooling and ample air
flow is required. Be sure cool air can flow freely
through the amplifier. Do not install near heat
sources such as other power amplifiers, hot air
vents, radiators, etc.

All Bryston amplifiers contain high quality, dedi
cated circuitry in their power supplies to reject RF,
line spikes and other power-line problems. Bryston
power amplifiers do not require any specialized

PLEASE REFER TO: “BRYSTON’S SAFETY MANUAL” FOR FURTHER OPERATING INSTRUCTIONS.

power line conditioners. Simply plug the amplifier
directly into its own wall socket.

Make sure the power switch on the front of the
amplifier is in the off (out) position. Plug the power
cord (female end) into the rear of the amplifier,
then insert the male end into the wall outlet. Finally,
upon completion of the installation activate the 9B
power switch only after all other equipment is pow
ered up.

Note:
If rack-mounting the 19 inch version please
ensure that the rear of the 9B is well supported.

Page 2

BRYSTON 9B ST MANUAL

9B ST Rear Panel

Input:

The 9B has two inputs, one for a
balanced source,and one for
single ended or un-balanced
source. The BAL input connec

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MAKE PROPER SPE/^ER CONNECTIONS.
SEE OPERATING MANUAL BEFORE USING.

tor will accept either a 3 pin
‘XLR’ type or a 1/4” Tip/Ring/
Sleeve type. The in phase (+)
terminal is pin 2 on the ‘XLR’
and tip on the TRS. The input

impedance is 15K ohms. The
input pins are gold plated. Input

sensitivity is selectable using the

‘INPUT’ slide switch. In the ‘BAL

REG’ position 2 Volts in = 100
Watts / 8 ohms output. This is
the recommended setting when

using Bryston pre-amplifiers or

Balanced Vs Unbalanced:

Balanced cable interconnects should be used

whenever possible, as they provide common

mode noise protection from external electrical

interference, and with active balanced outputs
a 6 dB higher signal level flows in the cable.
The unbalanced cable interconnect is provided
for pre-amplifiers without balanced output. Un

balanced cables should be kept to 10 feet or

less. In general never use longer cables than

necessary, never coil excess cable length, and

run signal wires away from and never parallel
to AC power or speaker cables.

Output:

Gold plated output binding posts provide three

different interconnect options. Stripped bare
wire up to 8 Ga. can be passed through the

hole in the binding post and held in place by
tightening the post knob. Additional tightening

pressure can be achieved using a coin in the

slots of the knob. Copper wire is malleable and

may require further tightening a month or

any pre-amplifier having active
balanced outputs. This setting
also produces the lowest ampli
fier noise floor.
The ‘BAL +6 dB” setting adds 6
db of gain to provide an input
sensitivity of 1 Volt in = 100
Watts / 8 ohms output. This set
ting is primarily for balanced out

puts that are transformer cou

pled, or other low level sources.
The ‘UNBAL’ setting selects the
gold plated ‘RCA’ type tip/sleeve

connector. The input impedance

is 50K ohms. The output is in

phase with the input and the

sensitivity is 1 Volt in = 100
Watts into 8 ohms output.

two after initial installation. When using bare
wire watch out for fine wire fragments shorting
from one wire to the other.
Wire terminated with banana plugs,spade lugs,
or pins are also accommodated by the binding
posts. We recommend gold plated connectors
to prevent corrosion and signal distortion.
The red (+) binding post is the output and

normally will be connected to the red (+) con
nector on the loudspeaker. The black (-) bind
ing post is ground and should be connected to

the black (-) connector on the loudspeaker.

Speaker wire should be kept as short as practi
cal and should never be terminated with con
nectors that may become confused with AC
power connectors. Speaker cables should be
dressed away from input and power cables,
and even each other when runs are long.

The minimum speaker ioad on the

amplifier is 4 ohms.

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