Bryston ST Series User manual

BRYSTON
OWNER’S MANUAL
Instructions For Bryston
ST Sales 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
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.
PLEASE REFER TO: “BRYSTON’S SAFETY MANUAL” FOR FURTHER OPERATING INSTRUCTIONS.
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¬
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.
Page 3

BRYSTON 9B ST MANUAL
Clipping indicators:
All Bryston amplifiers use bicolor LEDs with
green indicating power on and flashing red indi¬
cating actual overload or distortion. Upon power-
up the 9B’s LED’s will remain “red” until all volt¬
ages stabilize and the unit comes out of mute
and the LED turns green.
If the LED indicator contains a substantial red
content, when program is present, it should be
considered as a sign that the level is too high and
may cause speaker damage if it continues. It
should be remembered that the Bryston ST se¬
ries are powerful amplifiers, and that it is possible
to damage almost any speaker if an amplifier is
used in a thoughtless or abusive manner. Brys¬
ton will not be responsible for damage caused in
this manner.
The clip-sensing circuit uses an AC comparator
to detect any source of signal distortion including
clipping, short circuits in cabling, excessive DC or
supersonic signals, whether at the input or out¬
put. Most conditions which could cause the red
LED to light for more than a moment or two can
be dangerous to your loudspeakers and should
be corrected immediately.
If a specific LED remains “red” without signal
present, it may indicate a thermai overload
condition and the channel is shut down until
safe operating temperatures return.
Bryston 9B ST Remote Power Control - THX units only
r REMOTE POWER CONTROL^
LOCAL
REMOTE
SELECT ’LOCAL’ WHEN NOT
USING REMOTE POWER CONTROL
DC
OR
AC
4-12V
FRONT PANEL POWER SWITCH
MUST BE ’ON’ WHEN USING
REMOTE POWER FUNCTION.
n
©
I
i©
The 9B ST remote power control
function allows the user to link the
power on/off of the 9B to an exter¬
nal preamplifier, processor, or
other control device. This is useful
in installations, such as home the¬
ater, for powering up multiple am¬
plifiers, often at distant locations
from the source.
Located on the back panel of the
9B ST is a two screw terminal
input connector. The amplifier
can be powered-up by applying
4-12 Volts (AC or DC of either
polarity) connected to the termi¬
nals of the jack. This jack will
accept 1/4 inch stripped wire
ends, inserted into the square
holes provided, and the adjacent
screws carefully tightened to
hold them in place. The input
current remains at less than 3
ma regardless of voltage, there¬
fore 22 Ga wire is sufficient.
^ The front panel power switch must be left in
the "on" position (in), at all times for the am¬
plifier to operate in remote power control
mode.
^ In ‘REMOTE’ position the amplifier can only
be turned on by applying a remote control
voltage of 4-12 volts.
In the ‘LOCAL’position the amplifier will not
respond to remote control voltage, only the
front panel power switch.
^ At all times the power can be turned off by
using the front panel power switch.
Page 4

Typical Surround Sound Hookup:
Shown below: is a typical hookup between a
surround sound processor and the 9BST. We
show balanced interconnects which we rec¬
ommend especially when the 9B is located
more than 10 feet from the processor. The
connections would be similar using the unbal¬
anced interconnects. This suggested layout
when viewed from the front of the 9B has the
center channel in the middle and left and right
front channels adjacent to the center with left
UNBALANCED OUTPUTS
RIGHT CENTER LEFT LSURR SUB
@ (§)(§) @ @
RSURR
REMOTE 12V
OUTPUT
RIGHT
BALANCED OUTPUTS
CENTER LER
LSURR SUB
and right surround speakers juxtaposed to
the appropriate left and right front channels.
This particular setup allows you to easily
monitor the status of each individual channel
as the power LED’s will correlate with the
positions of the speakers in most rooms (see
diagram below). It should be noted that be¬
cause each channel on the 9B is identical
any channel can be operated with any input
and arranged as required.

For Bryston amplifiers with rear panel gain adjustment including the THX designation
the correct THX position is as indicated on the back panel.
OH-QT TW’lf
I I flA.
The “BAL THX” or the “UNBAL THX” position
(see diagram) is the correct setting for the slide
switch. Do not place the slide selector in the
middle or +6 dB position if installed in an
authorized THX system.
BAL
+ 6dB
INPUT
sn
S ERI ES
Thx
UNBAL
THX
J
"WARNING!
RISK OF HAZARDOUS ENERGY!
MAKE PROPER SPEAKER CONNECTIONS.
SEE OPERATING MANUAL BEFORE USING.
120W80
9B PRO THX
The 9B professional version provides a rotary
gain control which must be turned fully clockwise
if installed in a THX system and the slide switch
above (see diagram) must also be in either the
“BAL THX” or “UNBAL THX” position.
^ □ ]C]?SnCDQ]
ODpro
BAL
+ 6 dB
UNBAL
THX
LEVEL
"WARNING!
RISK OF HAZARDOUS ENERGY!
MAKE PROPER SPEAKER CONNECTIONS.
SEE OPERATING MANUAL BEFORE USING.
-14 dB THX
120W80
+
RO. Box 2170, 677 Neal Drive,
Peterborough, Ont., Canada K9J 7Y4
Tel: [phone] ® Fax: [phone]

Bryston products are warranted to be free
from manufacturing defects for a minimum
of twenty years from the original date of
manufacture. This includes parts, labour
and return shipping to the first owner and
all subsequent owners. Warranty coverage
is automatic and commences with the
original date of manufacture which is kept
on file at Bryston.
In the event of a defect or malfunction,
Bryston will remedy the problem by repair
or replacement, as we deem necessary, to
restore the product to full performance.
This warranty is considered void if the
defect, malfunction or failure of the
product or any component part was
caused by damage ( not resulting from
a defect or malfunction ) or abuse while
in the possession of the customer.
Tampering by persons other than factory
authorized service personnel, or failure
to fully comply with Bryston operating
instructions, voids the warranty.
This warranty gives you specific legal
rights and you may also have other
rights which may vary from province to
province and country to country.
FOR BRYSTON SERVICE OUTSIDE CANADA:
CONTACT YOUR LOCAL DISTRIBUTOR
OR CHECK OUR WEB SITE AT:
www.bryston.ca
OR CALL BRYSTON DIRECTLY AT:
PHONE: [phone]
FAX: [phone]
BRYSTON SERVICE CANADA:
24 STEINWAY BLVD,. UNIT 48
ETOBICOKE, ONTARIO
CANADA M9W 6T8
PHONE: [phone]
FAX: [phone]
BRYSTON LTD.
P.O. BOX 2170,677 NEAL DRIVE
PETERBOROUGH, ONTARIO
CANADA K9J 7Y4
PHONE: [phone]
FAX: [phone]
BRYSTON SERVICE U.S.A.:
30 COVENTRY ST.
NEWPORT VERMONT.
U.S.A. 05855
PHONE: [phone]
FAX: [phone]
Specifications: 9B-120-R channel
power rating:
120 Watts into 8 Q
200 Watts Into 4 Q
input impedance: I
balanced
15kO
unbalanced 50 kQ
sensitivity:
bal input reg
2 Volt in = 100 Watts/8Q
bal input +6
1 Volt In = 100 Watts/8 Q
unbal
1 volt in = 100 Watts / 8 Q
distortion:
Thd + N
.007% 20Hz to 20kHz at 120 Watts / 8 0
IMD
.002% 60 Hz + 7kHz mixed 4 to 1
noise
-107db 20Hz to 22kHz bandpass
power consumption:
all channels at full power with 8 ohm loads = 900 VA.
all channels at full power with 4 ohm loads = 1600VA.
all channels idle = 100 VA.
9B-120-P channel
The 9B-PRO version provides for input attenua¬
tion of up to 14dB by adjusting the ‘LEVEL’
control. Full attenuation versions are also avail¬
able. Level controls are not available on THX
versions.
THX
THX MODELS ARE MANUFACTURED UNDER
LICENSE FROM LUCASFILM LTD. THX IS A
TRADEMARK OF LUCASFILM LTD.
dimensions
rack mount models 19” x 17" x 5.25”
17" models 17” x 17” x 5.25"
shipping weight 75 lbs