Ashly GQX-1502, GQX-3102, GQX-3101 User Manual
GQX Series
Model 3102
Stereo Third Octave
Graphic Equalizer
On
Off
Power
GQX-3102
GQX-3101
GQX-1502
Graphic Equalizer
Operating Manual
20 25 31.5 40 50 63 80 1 00 125 160 2 00 250 3 15 400 500 6 30 800 1 K 1.25K 1.6K 2K 2. 5K 3.15K 4K 5K 8K 1 0K 12.5K 16K 20K6.3K
+15 (+6)
+10
+5
0
-5
-10
-15 (-6)
+15 (+6)
+10
+5
0
-5
-10
-15 (-6)
+6
+4
+2
-
+6
+4
+2
-
0
-3
-9
0
-3
-9
Channel 1
Gain(dB)
Channel 2
-12
-15
-18
-21
-12
-15
-18
-21
+6
+3
0
-3
-6
-9
Output
+6
+3
0
-3
-6
-9
VU
Clip
Range
6 - 15
In - Out
EQ
HPF
In - Out
50
100
25
200
285
12
(Hz)
Level
VU
Clip
Range
6 - 15
EQ
In - Out
HPF
In - Out
50
100
25
200
285
12
(Hz)
Clip
0
Gain
(dB)
Gain (dB)
+6
+4
+2
-
Ch1 Ch2
VU
+6
Range
25
EQ
HPF
50
12
(Hz)
Channel 1
Channel 2
HPF
(40Hz)
HPF
(40Hz)
6 - 15
In - Out
In - Out
100
200
285
Clip
EQ In - Out
In - Out
Clip
EQ In - Out
In - Out
+3
0
-3
-6
-9
-12
-15
-18
-21
Output
Level
0
-3
-9
GQX Series
Model 3101
Third Octave
Graphic Equalizer
GQX Series
Model 150 2
Stereo 15 Band
Graphic Equalizer
20 25 31.5 40 50 63 80 100 125 1 60 200 250 3 15 400 5 00 630 800 1 K 1 .25K 1.6 K 2K 2. 5K 3.15K 4K 5K 8K 10K 12.5K 16K 20K6.3K
Power
Channel 1 Channel 2
25 40 63 100 180 250 400 630 1 K 1.8K 2.5K 4K 6. 3K 10K 18K 25 40 63 100 180 250 400 630 1 K 1.8K 2.5K 4K 6. 3K 10K 18K
Power
+15
+10
+5
0
-5
-10
-15
+15(+6)
+10
+5
0
-5
-10
-15(-6)
+6
+4
+2
-3
-9
-
+15
+10
+5
0
-5
-10
-15
ASHLY AUDIO INC.
847 Holt Road Webster, NY 14580-9103 Phone: (716) 872-0010
Toll-Free: (800) 828-6308 Fax: (716) 872-0739 Inter net: http://www.ashly.com/
Operating Manual - GQX 3102, GQX 3101, and GQX 1502 Graphic Equalizer
Table Of Contents
1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 AUDIO CONNECTORS AND CABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1 Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2 Servo-Balanced Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 AC POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5 CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.1 Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.2 High-Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
5.3 Equalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.4 EQ Bypass Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.5 Range Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
5.6 Level Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6 TYPICAL APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6.1 General Tone Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6.2 Feedback Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6.3 Console Channel Equalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6.4 Large Room Equalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7 DESIGN THEORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
8 TROUBLESHOOTING TIPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
9 DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
10 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
11 WARRANTY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
12 SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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Operating Manual - GQX 3102, GQX 3101, and GQX 1502 Graphic Equalizer
1. INTRODUCTION
Congratulations on your purchase of an Ashly GQX series graphic equalizer. The GQX series
equalizers are a second generation design including many refinements on our original GQ models.
Lower noise and distortion, greater accuracy , and additional output options are the result. We continue
using “Q” enhanced Wein bridge filters and interleaved summing for constant “Q”, low ripple, and
minimum filter interaction. A servo-balanced output stage simulates a true transformer output to allow
interfacing with virtually any type of load.
2. UNPACKING
As a part of our system of quality control, every Ashly product is carefully inspected before
leaving the factory to ensure flawless appearance. After unpacking, please inspect for any physical
damage. Save the shipping carton and all packing materials , as they were carefully designed to reduce
to minimum the possibility of transportation damage should the unit again require packing and shipping. In the event that damage has occurred, immediately notify your dealer so that a written claim to
cover the damages can be initiated.
The right to any claim against a public carrier can be forfeited if the carrier is not notified
promptly and if the shipping carton and packing materials are not available for inspection by the carrier. Save all packing materials until the claim has been settled.
- WARNING -
THIS APPARATUS MUST BE EARTHED
3
Operating Manual - GQX 3102, GQX 3101, and GQX 1502 Graphic Equalizer
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)
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 balanced or unbalanced. When possible, we recommend balanced 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,
3
2
1
(-)(+)
(-)
(+)(-) (+)
Outputs
(Parallel)
XLR connector, or terminal strip for an unbalanced signal, 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 connection.
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 active 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.
Pins are
numbered
in the
connector
insert.
4
Tip (+)
Sleeve (Ground)
Mono Phone Plug
used for unbalanced
2 = (+)
3 = (gnd)
1 = (gnd)
Input Output
(gnd) (+) (+)
Chassis Ground Signal Ground
(gnd)
Unbalanced Audio Connectors
Terminal S trip
XLR Male
Tip (+)
Ring (-)
Slee ve (Ground )
Pins are
numbered
in the
connector
insert.
2 = (+)
3 = (-)
1 = (gnd)
Input Output
(-) (+) (-) (+)
Chassis Ground Signal Ground
Balanced Audio Connectors
Stereo Phone Plug
used for balanced
Terminal Strip
XLR Male
Operating Manual - GQX 3102, GQX 3101, and GQX 1502 Graphic Equalizer
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE
COVER. NO USER SERVICEABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED SERVICE PERSONNEL. TO REDUCE
THE RISK O F FIRE REPLACE ON LY WITH SAME TYPE F USE.
TO REDUCE T HE RISK OF FIRE OR ELECT RIC SHOCK DO NOT
EXPOSE THI S EQUIPMEN T TO RAIN OR MOIST URE.
AVIS:
RISQUE DE CHOC ELECTRIQUE -
NE PAS OUVRIR.
Ashly Au di o In c.
Rochester, NY
Made In U SA
Model GQX-3101
120 VAC 50-60 Hz.
24 Watts
1/2 Amp
CAUTION:
Disconnect power cord
before replacing fuse
ATTENTION:
Debranch er
avant d'ouvrir
Furthermore, if common-mode voltage (such as
60Hz noise voltage) gets induced on the output signal
lines, the resulting 60Hz noise current into the servo-balanced circuit would be insignificant because the commonmode output impedance is high. A conventional active
balanced output would cause significant noise current
resulting in more noise.
Essentially, the servo-balanced output circuit
behaves like a transformer balanced output because it
maintains a constant level into balanced and unbalanced
lines with a low differential impedance and a high common-mode impedance. The servo-balanced output also
does not suffer from problems associated with output
transformers such as low-frequency distortion, susceptibility to magnetic fields and poor frequency response.
3.3 Grounding
The terminal strip has two ground connections,
one for input ground and one for chassis ground. The
equalizer is shipped with a jumper strap connecting these
two grounds. Normally, this strap should be left in place
so the chassis and input grounds are connected. In a rackmount installation where the equalizer is connected to other
equipment with unbalanced inputs or outputs and the rack
itself provides a good electrical connection between the
equalizer chassis and the other equipment, it may be desirable to remove this strap to isolate the input ground
from chassis ground and avoid a ground loop.
Unless you have such an installation and have a
hum problem you can’t solve by other means (ie: using
balanced input and output connections), leave the ground
jumper strap in place.
4. AC POWER
Your GQX equalizer should be connected to a
standard 3-wire grounded electrical outlet supplying 120
Volts, 50-60 Hz (some export models are wired for 240
Volts, and are labeled as such). To reduce the risk of
ground loop hum, connect all audio equipment to the same
electrical power source. Removal of the gr ound pin is both
unlawful and dangerous, as a potential shock hazar d could
result.
This unit will perform normally within an AC
voltage range of 93 to 130 volts. Voltages less than this,
as found in “brown-out” conditions, will reduce headroom
and decrease power supply regulation. While this may
affect performance, the equalizer will continue to function during a brown-out. In the event of a blown fuse,
replace only with same type fuse. No user serviceable
parts are inside the chassis. Overall power consumption
is less than 25 watts.
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