Bryston 9B ST - Manual (Page 3)

BRYSTON 9B ST MANUAL
9B ST Rear Panel
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"WARNING! RISK OF HAZARDOUS ENERQYl
MAKE PROPER SPE/^ER CONNECTIONS.
SEE OPERATING MANUAL BEFORE USING.
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
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.
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
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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