Bryston 60 - Manual (Page 5)

SPECIAL INSTRUCTIONS
The PowerPac 120/300 remote on/off
function allows the user to link the power
on/off of an amplifier, or group of amplifi-
ers, to an external preamp, or other control
product. This is useful in installations, such
as home theater, which usually present a
convenience problem for powering up mul-
tiple amplifiers, often at distant locations
from the source.
Located on the front panel of the
PowerPac 120/300 (see illustration), is a
two terminal 12 volts (active range 9 -12
volts AC or DC of either polarity),
input
connector and a potentiometer. The
PowerPac amplifiers can then be powered-
up by an external 12-volt signal connected
to the terminals of the jack.
This jack will accept 1/4 -inch stripped
wire ends, inserted into the square holes
provided, and the adjacent screws care-
fully tightened to hold them in place. The
internal "delay" turn-on circuit, will delay
turn–on between 1 and 10 seconds, follow-
ing application of the 12-Volts. In this way
groups of amplifiers may be sequenced on
to distribute power surges over a period of
time.
The power switch must be left in the
“off” position, at all times for the
PP120 amplifier to operate in the re-
mote mode.
The PP300 has a 3-position switch al-
lowing for ‘Local (on)’ or ‘Off ‘or ‘REM
(remote)’ power selection.
The amplifier will remain powered-up
while the 12-Volt signal is present, and
will turn off when the 12-Volt signal is
switched off.
Input sensitivity is selectable using the
‘INPUT’ slide switch. In the ‘ BAL REG' posi-
tion, 2 Volts in will give 100 Watts into 8
ohms at the output. This is the recom-
mended setting
when using Bryston pre-
amplifiers or other pre-amplifiers having ac-
tive balanced outputs. This setting also pro-
duces the lowest 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 at the output for outputs
that are transformer coupled, or low level
sources.
The ‘UNBAL ’ setting selects the gold plated
‘phono’ type connector. The input impedance is
50K ohms.
POWERPAC 120/300