INPUT CONNECTORS
The 2B-LP is supplied with one pair of input connectors; either unbalanced RCA/phono connectors on the "REG"
(home audio) versions or 3 pin balanced XLR jacks (pin 1 is ground, pin 2 is positive & pin 3 is negative) with fully
discrete active input circuitry on "PRO" units. "PRO" models also come equipped with independent, front mounted
level controls and front a mounted 1" headphone jack.
All input connectors are gold plated and should be used only with quality gold plated input cable connectors
as a poorly plated connector will eventually corrode through the gold flash. Bryston makes cables with appropriately
heavily plated, high quality connectors, available through your dealer.
OUTPUT CONNECTORS
The 2B-LP is equipped with four binding post terminals (2 red, 2 black) which can accept either standard banana
plugs or bare wire. Refer to the rear panel hookup diagram and to the descriptions of DUAL and MONO operation
for details on how to connect speakers to these terminals. Since the binding posts are gold-plated we recommend
gold-plated banana plugs be used for the lowest distortion.
N.B. Do not attempt to remove the red or black connector nuts from the binding post connectors. They are not
removable and attempting to force them off may break the connector or strip the threads.
OUTPUT CABLES
For some time there have been available on the market special speaker cables constructed for extra high current
and low loss and distortion. These cables will cause no difficulty or instability with any Bryston amplifier. In fact, we
recommend that low inductance cables be used for the smallest loss of signal between amplifier & speaker.
GROUNDING and the GROUND SWITCH
The left most switch on the rear panel is a GROUND LIFT switch. It is connected between the chassis ground
(including the third prong on the power line cord) and the signal ground. This switch is normally left in the
connected (closed) position. Occasionally a multi-amplifier rack installation, or an unusual grounding situation with
a preamp using a three wire power line cord, will cause a ground loop between the signal ground and the chassis
ground. This switch will allow the elimination of the resulting hum in such cases without resorting to a "cheater"
plug by switching to the separated (open) position. Note that this switch does not disconnect the chassis from the
third prong on the power line cord which must be left intact for safety reasons.
REMOTE ON/OFF CONTROL
This feature is controlled by a toggle switch located on the rear panel. It allows the 2B power amplifier to be turned
on or off by application of control voltage of 12V (AC or DC) at 5mA. The control voltage is connected via the dual
spring loaded terminal block located beside the "Remote/Local" toggle switch. To insert wires press a small (1/8"
wide maximum) blade screwdriver into the small rectangular orange slotted levers located at the top of the terminal
blocks. While pressing in against the lever, insert the control voltage wires into the circular openings, then release
the lever. The terminal blocks can accept stranded wire gauges between 18 to 26 AWG. To bypass the remote
on/off control, place the toggle switch in the "LOCAL" position. To turn the power amplifier off, place the toggle
switch in the centre position. Only when the toggle switch is in the "REMOTE" position will the 2B respond to a
remote control voltage. Please note that some 2B-LP models may contain a mechanical push-button power switch
located on the front panel. This mechanical power switch is in series with the remote electronic power switch, and
must therefore be in the ON (pressed in) position to enable the amplifier. If the front power switch is in the OFF (out)
position, then the amplifier will be off regardless of the position of the rear mounted "Remote ON/OFF" switch or
the presence or absence of a dc control voltage.
The control voltage must be 12V at 5mA, but it can be either AC or DC due to an internal rectifier circuit.
If a DC control voltage is used, it does not matter which terminal is connected to positive and which is connected
to negative.
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