HHB Circle 5A, Руководство по обслуживанию

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Page 4
1.0 Externals
This is a view of the external controls on
the Circle5A.
The function of the Master Volume control
is to scale down excessive input signals.
In a set-up where the signal level is
scaled so that set to maximum (fully
clockwide) an input of 0.775vdBv, on the
loudest peaks, will fully drive the power
amplifiers.
Since many studios use the ‘+4’ signal
reference as the maximum, it may be an
idea to reduce the Master Volume to, say,
‘6’ and control the signal at the mixer.
There are two input connectors: a master
input, an isolated XLR following the nor-
mal European wiring convention:
Pin 1 = shield (ground)
Pin 2 = Live, hot, + signal
Pin 3 = Cold, -, return signal
Also provided is a secondary input: a
Phono (Cinch, RCA) connector for unbal-
anced systems. The centre pin is ,
and the connector case is the ground.
The selector switch converts the master
input (the XLR) to unbalanced mode suit-
able for the phono input - it does not
switch between the two inputs.
Connect to EITHER the XLR or the
phono, not both.
The metal parts of the panel are isolated
from mains ground - the so called double
isolation standard.
Only use the mains cable supplied.
Replace the mains fuse with the correct
type.