Audio Connectors And Cables; Inputs; Servo-Balanced Output - Ashly GQX-1502 Operating Manual

Operating Manual - GQX 3102, GQX 3101, and GQX 1502 Graphic Equalizer
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,
Tip (+)
Sleeve (Ground)
Pins are
2 = (+)
numbered
3 = (gnd)
in the
1 = (gnd)
connector
insert.
Input Output
(gnd) (+) (gnd)
Chassis Ground Signal Ground
Unbalanced Audio Connectors
4
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.
PUSH
Inputs
(Parallel)
Mono Phone Plug
used for unbalanced
XLR Male
Terminal Strip
(+)
3
2 1
(+) (-)
(-) (+) (-)
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.
Tip (+)
Ring (-)
Sleeve (Ground)
Pins are
2 = (+)
numbered
in the 3 = (-)
1 = (gnd)
connector
insert.
Input
(-) (+)
Chassis Ground Signal Ground
Balanced Audio Connectors
(+)
Outputs
(Parallel)
Stereo Phone Plug
used for balanced
XLR Male
Output
Terminal Strip
(-) (+)