4
Operating Manual - GQX 3102, GQX 3101, and GQX 1502 Graphic Equalizer
Inputs
(Parallel)
Outputs
(Parallel)
(-)
(+)(-) (+)
Input is active balanced.
Output is active servo-balanced.
If unbalanced connection is used
be sure to ground unused path.
Maximum in/out level is +22dBu.
(-)(+)
2
3
1
PUSH
3. AUDIO CONNECTORS AND CABLES
Your GQX series equalizer is provided with three
different connector types. 1/4 inch stereo phone jacks,
three pin XLR type connectors, and a terminal strip will
allow interfacing to most professional audio products.
Inputs as well as servo-balanced outputs can be used bal-
anced or unbalanced. When possible, we recommend bal-
anced connections between all components in your system,
as this eliminates ground-loop induced hum and noise.
3.1 Inputs
If inputs are used unbalanced, the signal should
be on the (+) connection and the (-) connection must be
tied to ground. A mono phone plug used as an unbalanced
connection will automatically ground the ring of the jack
which is the (-) connection. When using a stereo plug,
XLR connector, or terminal strip for an unbalanced sig-
nal, the (-) input connection MUST be tied to ground, or
loss of signal level may result.
3.2 Servo-Balanced Output
The Ashly servo-balanced output circuit is an
active balanced output. This circuit maintains a constant
output level (or difference voltage) between the (+) and
(-) output terminals, regardless of either terminal being
connected to ground as in an unbalanced output connec-
tion.
This servo-balanced output has an advantage over
conventional active balanced outputs in that the signal
level is unchanged when either the (+) or the (-) output
terminals are connected to ground. A conventional ac-
tive balanced output would suffer a signal loss of 1/2 the
output voltage (or -6dB) if one of the output terminals
were grounded in an unbalanced connection.
Mono Phone Plug
used for unbalanced
Tip (+)
Sleeve (Ground)
Pins are
numbered
in the
connector
insert.
XLR Male
2 = (+)
3 = (gnd)
1 = (gnd)
(gnd) (+) (+)
Input Output
Chassis Ground Signal Ground
Terminal Strip
Unbalanced Audio Connectors
(gnd)
Stereo Phone Plug
used for balanced
Tip (+)
Ring (-)
Sleeve (Ground)
Pins are
numbered
in the
connector
insert.
XLR Male
2 = (+)
3 = (-)
1 = (gnd)
(-) (+) (-) (+)
Input Output
Chassis Ground Signal Ground
Terminal Strip
Balanced Audio Connectors
(12 pages)
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