GQX-3102
GQX-1502
Graphic Equalizers
Operating Manual
Ashly Audio Inc.
847 Holt Road, Webster, NY 14580-9103
Toll Free (800) 828-6308, Telephone (585) 872-0010, FAX (585) 872-0739
www.ashly.com
All Trademarks referred to herein, are the property of their respective owners. R-042707
All Rights Reserved
Page - 2
Operator Manual – GQX Series Equalizers
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Copyright© 2007 – Ashly Audio Inc.
Operator Manual – GQX Series Equalizers
Page - 3
Important Safety Instructions
Consignes de sécurité à lire attentivement
Safety Instructions – 3
Introduction - 4
GQX Equalizers – 5
Connectors & Cables – 5
Physical Description - 6
Installation – 7
Typical Applications - 8
The lightning flash with arrowhead symbol, within an equilateral triangle, is
intended to alert the user to the presence of uninsulated "dangerous voltage"
within the product's enclosure that may be of sufficient magnitude to constitute a
risk of electric shock to persons. The exclamation point within an equilateral
triangle is intended to alert the user to the presence of important operating and
maintenance instructions in the literature accompanying the device.
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Read these instructions.
Keep these instructions.
Heed all warnings.
Follow all instructions.
To reduce the risk of fire or electric shock, do not expose
this apparatus to rain or moisture.
Do not use this apparatus near water.
Clean only with dry cloth.
Do not block any ventilation openings. Install in
accordance with the manufacturer’s instructions.
Do not install near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including amplifiers)
that produce heat.
Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug has
two blades and a third grounding prong. The wide blade
or the third prong are provided for your safety. If the
provided plug does not fit into your outlet, consult an
electrician for replacement of the obsolete outlet.
Protect the power cord from being walked on or pinched
particularly at plugs, convenience receptacles, and the
point where they exit from the apparatus.
Only use attachments/accessories specified by the
manufacturer.
Use only with the cart, stand, tripod, bracket, or table
specified by the manufacturer, or sold with the
apparatus. When a cart is used, use caution when
moving the cart/apparatus combination to avoid injury
from tip-over.
Unplug this apparatus during lightning storms or when
unused for long periods of time.
Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as power-supply cord or plug
is damaged, liquid has been spilled or objects have fallen
into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has been
dropped.
Le symbole de la flèche dans un triangle équilateral symbolisant la foudre est
prévu pour sensibiliser l’utilisateur à la présence de tension de voltage non isolée
à l’intérieur de l’appareil. Elle pourrait constituer un danger de risque de
décharge électrique pour les utilisateurs. Le point d’exclamation dans le triangle
équilatérale alerte l’utilisateur de la présence de consignes qu’il doit d’abord
consulter avant d’utiliser l’appareil.
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Lisez ces instructions.
Conservez ces instructions.
Observez les avertissements.
Suivez ces instructions.
Pour réduire le risque de feu ou la décharge électrique,
ne pas exposer cet appareil pour pleuvoir ou l'humidité.
Ne pas utiliser l’appareil près de l’eau.
Le nettoyer à l’aide d’un tissus sec.
Ne pas bloquer les ouvertures de ventilation, installer
selon les consignes du fabricant.
Eloigner des sources de chaleur tel: radiateurs,
fourneaux ou autres appareils qui produisent de la
chaleur.
Ne pas modifier ou amputer le système de la mise à
terre. Une prise avec mise à terre comprend deux lames
dont une plus large ainsi qu’une mise à terre: ne pas la
couper ou la modifier. Si la prise murale n’accepte pas
la fiche, consulter un électricien pour qu’il remplace la
prise désuète.
Protéger le cordon de secteur contre tous bris ou
pincement qui pourraient l’endommager, soit à la fiche
murale ou à l’appareil.
N’employer que les accessoires recommandés par le
fabricant.
N’utiliser qu’avec les systèmes de fixation,chariots,
trépied ou autres, approuvés par le fabricant ou vendus
avec l’appareil.
Débrancher l’appareil lors des orages électriques ou si
inutilisé pendant une longue période de temps.
Un entretient effectué par un centre de service accrédité
est exigé si l’appareil a été endommagé de quelque
façon: si il a été exposé à la pluie,, l’humidité ou s’il ne
fonctionne pas normalement ou qu’il a été échappé.
All Rights Reserved
Troubleshooting - 9
Dimensions - 9
Specifications - 10
Warranty - 11
This manual uses a
Perpetual Table Of
Contents. Each page
has a copy of the
manual’s contents in a
gray box just like this
one. The section you are
in will always be bold
with the other sections
“grayed out.” The feature
allows you to jump
directly to another
section without having to
return to a Table Of
Contents page.
Page - 4
Operator Manual – GQX Series Equalizers
Safety Instructions – 3
Introduction - 4
GQX Equalizers – 5
Connectors & Cables – 5
Physical Description - 6
Installation – 7
Typical Applications - 8
Troubleshooting - 9
Dimensions - 9
Specifications - 10
Warranty - 11
Introduction
Congratulations on your purchase of an Ashly GQX Equalizer. GQX equalizers offer a wide
range of professional features including:
Constant "Q" Design with Low Ripple and Accurate Response Near the "Flat" Setting
Precision Wein-bridge Filters for Accurate Response and Low Distortion
Switchable High Pass Filter
High Quality Detented Metal-Shaft Fader
Frequency Sliders Feature Center Detent “Off”
Worldwide Power Supply
Balanced XLR, 1/4", and Euroblock Inputs
Servo-Balanced XLR, 1/4", and Euroblock Outputs
We are confident that you will be pleased with the high performance, superb sound quality,
and reliability that Ashly is known for.
About Ashly
Ashly Audio was founded in 1974 by a group of recording engineers, sound professionals,
and electronics designers. The first products were custom consoles for friends and
associates, but business quickly grew. The philosophy established from the very beginning
holds true today: to offer only the highest quality audio tools at an affordable cost to the
professional user – ensuring reliability and long life. More than thirty years later, Ashly
remains committed to these principles.
Copyright© 2007 – Ashly Audio Inc.
Operator Manual – GQX Series Equalizers
Page - 5
Safety Instructions – 3
GQX Equalizers
Introduction - 4
GQX equalizers use “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.
GQX equalizers have with three different connector types:
1/4” inch stereo phone jacks
Three pin XLR type connectors
Euroblocks
These three connectors facilitate interfacing to most professional audio products. Inputs as
well as servo-balanced outputs can be used balanced or unbalanced
GQX Equalizers – 5
Connectors & Cables – 5
Grounding
Physical Description - 6
Installation – 7
Typical Applications - 8
Troubleshooting - 9
Dimensions - 9
Specifications - 10
Warranty - 11
Connectors & Cables
Your GQX series equalizer is provided with three different connector types:
1. 1/4 inch stereo phone jacks (TRS)
2. Three pin XLR type connectors
3. Euroblock Connector
When possible, balanced connections are recommend between all components in your
system, as this eliminates ground-loop induced hum and noise.
GQX Connector Polarities
Unbalanced Connections and Grounding
If you must use unbalanced connectors, the negative lead of the connector should be tied to
the ground lead. Using unbalanced connections could result in chassis ground-loop noise.
Altering the signal/chassis ground relationship in equipment connected to your GQX unit
may eliminate the noise.
All Rights Reserved
Page - 6
Operator Manual – GQX Series Equalizers
Safety Instructions – 3
Introduction - 4
GQX Equalizers – 5
Connectors & Cables – 5
Physical Description - 6
Front Panel
Rear Panel
Physical Description
The GQX-3102 is 3RU, and weighs 12 pounds, while the GQX-1502 is 2RU, and weighs 9
pounds. This manual shows images of both models.
GQX-3102 Front Panel
Installation – 7
Typical Applications - 8
Troubleshooting - 9
Dimensions - 9
Specifications - 10
Warranty - 11
1.
2.
3.
4.
Power – Switches the unit power on or off.
Equalization - The individual equalization
faders adjust the gain or loss at each filter
frequency. There are 31 of these faders per
channel on the 3102, and 15 faders per
channel on the 1502. By adjusting a
combination of faders, an overall frequency
response can be developed and the physical
position of the faders will give an approximate
visual indication of this response.
Gain - The gain control adjusts the overall gain
of the equalizer when the EQ switch is “in”. It is
generally used to compensate for level
changes due to the equalization process, but
can also adjust overall system level and gain
structure. Overall gain with this control is from
+6dB to -.
Level Meters - On the GQX-3102, a 10segment, two color LED level meter indicates
the output level of the equalizer. A Clip
indicator LED on all models illuminates when
any point in the equalizer signal path reaches a
level within 3dB of clipping.
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7.
Range Switch - This switch selects the
operating range of the individual equalization
faders between 15dB and 6dB on the 3102.
The 15dB settings should be used when this
much equalization is needed. The 6dB setting
allows finer resolution on the fader settings.
EQ Bypass Switch - This switches the Graphic
Equalization and gain adjustments, allowing the
effect of any equalization to be compared to a
“flat” response. This switch does not defeat the
High-pass filter.
High-Pass Filter - The high-pass filter can be
used to supplement the frequency response
achieved by the bandpass filters. Its function is
to “roll off” the response below a given
frequency eliminating subsonic interference like
wind noise or floor rumble. This frequency is
adjustable between 14Hz and 280Hz on the
3102, and is fixed at 40Hz on the 1502.
Copyright© 2007 – Ashly Audio Inc.
Operator Manual – GQX Series Equalizers
Page - 7
Safety Instructions – 3
GQX-1502 Rear Panel
Introduction - 4
GQX Equalizers – 5
Connectors & Cables – 5
Physical Description - 6
Front Panel
Rear Panel
1.
Inputs - For unbalanced inputs, the signal
should be on the + connection and the connection tied to ground. A mono 1/4” plug
used as an unbalanced connection will
automatically be grounded. When using a
stereo plug, XLR connector, or Euroblock for an
unbalanced signal, the (-) input connection
MUST be tied to ground.
2.
Ashly Servo-Balanced Output - This output
circuit is an active output which maintains a
constant output level between the (+) and (-)
output terminals, regardless of either terminal
being connected to ground. This servobalanced output provides an unchanged signal
without regard to ground.
Installation
Use four screws and washers when rack mounting the Equalizer. For mobile use, the unit
should be further secured as appropriate.
General Requirements
GQX Equalizers have specific physical, electrical and signal requirements for proper
operation. These requirements will vary depending on your specific application, setup, and
the settings on the Equalizer. When setting up and testing your system, please take special
care to double check all connections and settings. Please refer to the specifications section
of this manual for specific input, output and other figures.
AC Power
Your GQX equalizer should be connected to a standard 3-wire grounded electrical outlet
supplying 100-240 Volts, 50-60 Hz. To reduce the risk of ground loop hum, connect all
audio equipment to the same electrical power source. Removal of the ground pin is both
unlawful and dangerous, as a potential shock hazard could result.
This unit will perform normally within the AC voltage range specified above. Voltages
less than this, as found in “brown-out” conditions, may reduce performance. 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.
NOTE: The power switch does NOT isolate the appliance from mains. Make sure the mains
power socket or an alternative disconnect device is near by and easily accessible. When the
product is connected to mains, the line-filter and the input of the fuse are energized.
All Rights Reserved
Installation – 7
General Requirements
AC Power
Typical Applications - 8
Troubleshooting - 9
Dimensions - 9
Specifications - 10
Warranty - 11
Page - 8
Operator Manual – GQX Series Equalizers
Safety Instructions – 3
Introduction - 4
Typical Applications
GQX Equalizers – 5
The following information will help you make the most of your new equalizer:
Connectors & Cables – 5
General Tone Control
Physical Description - 6
Installation – 7
Typical Applications - 8
General Tone Control
Feedback Control
Console Equalization
Room Equalization
Troubleshooting - 9
Dimensions - 9
Specifications - 10
Warranty - 11
The graphic equalizer is a very useful device for general tone shaping because it is intuitive
and easy to adjust. The visual reference provided by the slider position gives an
approximate idea of the frequency response generated, with the lower frequencies on the
left and higher frequencies on the right. To use the power of an equalizer effectively, you
need to translate your idea of the tone you want to produce into a range of numerical
frequencies. This is simple after a little practice. Here are a few references which are
useful for starting points:
Very low bass (the “wind” in a kick drum, almost felt as much as heard -40Hz80Hz.
The low register of a male voice - 200Hz
The low register of a female voice - 350Hz
Lower midrange (“warmth” frequencies) - 400Hz-1KHz
Upper midrange (“harshness”, snare drum “bite”, “hot” sound) -2.5KHz-4KHz.
Sibilance (“sss” sounds, cymbal “sizzle”) - 8KHz-15KHz.
Try using these starting points as a guide when you want more or less of these types of
sounds. Adjust by ear from there. It is always a good idea to remember that a little
equalization usually works out much better than a lot, and that there are many audio
problems which can not be solved with equalization alone.
Feedback Control
A graphic equalizer can be used to provide some control over moderate feedback
problems, but does not have enough flexibility or resolution to handle severe situations.
You will achieve the best results when you can eliminate one or two feedback points by
setting one or two sliders for no more than a 6dB cut. Often you can find a feedback point
by boosting sliders in succession to determine which frequency ranges contain the
feedback modes, and then cutting those ranges. Be very careful in this process to avoid
explosive feedback and possible system and hearing damage. If you find feedback points
with many equalizer bands, cutting every band may not help (all you will do is reduce
system gain). The combination of a graphic equalizer for tone control and a parametric
equalizer for feedback control is highly recommended.
Console Channel Equalization
Many mixing consoles provide only simple equalization for individual channels. If your
console has channel inserts, you can patch your graphic equalizer into a channel requiring
more precise equalization.
Large Room Equalization
Large rooms tend to suffer from multiple reflections with long time delays, long
reverberation times, and “ringmodes”, all of which lead to reduced intelligibility and a
generally “muddy” sound. As sound travels long distances through the air, high
frequencies are attenuated more than low frequencies. In general, large rooms benefit from
some low frequency roll-off, high frequency boost, and attenuation of ring mode
frequencies. As in the case of feedback control, a graphic equalizer can help reduce an
isolated ring-mode or two, but a tunable narrow-band equalizer such as a parametric is
more effective here.
Copyright© 2007 – Ashly Audio Inc.
Operator Manual – GQX Series Equalizers
Page - 9
Safety Instructions – 3
Troubleshooting
Introduction - 4
Situation
Action
GQX Equalizers – 5
No Audio Output
Check AC power - is the power LED on?
Check in/out connections - are they reversed?
Are you sure you have an input signal?
Is the master EQ switch in?
The lowest and highest frequency sliders may be beyond the range of the program material
or speakers and may produce little, or no audible effect.
If the peak light flashes, the signal level to the equalizer is too high. Turn down the gain. If it
is on all the time, disconnect the input and output cables. If it is still on, the unit must be
returned for service.
This will only be caused by too much signal, which will show on the Clip LED. If the LED is
not flashing, there is an overload somewhere else in the signal path. Adjust the relative gain
of each component in your chain to keep everything at a comfortable level.
Connectors & Cables – 5
EQ Controls Do Nothing
Peak Light Flashes or
Stays On All the Time
Distorted Sound
Excessive Hum or Noise
Hum will usually be caused by a ground loop between components. Try using the suggested
balanced input and output hook-ups if the other pieces of equipment used in conjunction with
your equalizer have balanced inputs and outputs. Noise (excessive hiss) can be caused by
insufficient drive signal. Make sure you are sending a nominal 0 dBu line level signal to the
equalizer. Most noise problems occur because gain is applied to audio signals too late in the
chain. For best performance, apply gain to individual source signals as early as possible, like
at the mixer input section. As gain increases, it also boosts the noise content of that signal.
Any cumulative noise built up in a mixed signal will only be increased by using an equalizer
as a gain device, so make every attempt to operate the equalizer with as little gain as
possible.
Note: Unshielded cables, improperly wired connections, and cable with broken strands
(shorts, etc.) are the most common problems. Make sure you use good quality cable with
connectors soldered firmly on the correct pin. When in doubt, get in touch with your Ashly
dealer.
Dimensions
Inches (Millimeters)
All Rights Reserved
Physical Description - 6
Installation – 7
Typical Applications - 8
Troubleshooting - 9
Dimensions - 9
Specifications - 10
Warranty - 11
Page - 10
Safety Instructions – 3
Introduction - 4
Operator Manual – GQX Series Equalizers
Specifications
GQX Equalizers – 5
Specification
Input
Connectors & Cables – 5
Type
Physical Description - 6
Installation – 7
Typical Applications - 8
Troubleshooting - 9
Dimensions - 9
Specifications - 10
Warranty - 11
Impedance
Max Level
Connectors
Output
GQX-1502
GQX-3102
Active Balanced
Active Balanced
20K
20K
+23dBu
+23dBu
1/4” Phone Jack (TRS), XLR, Euroblock
Servo-Balanced
Servo-Balanced
Source Impedance
100
100
Min Load Impedance
600
Type
Max Level
Connectors
600
+23 dBu
1/4” Phone Jack (TRS), XLR, Euroblock
+23 dBu
Overall
20 Hz - 20 kHz, +/- 0.25 dB
20 Hz - 20 kHz, +/- 0.25 dB
THD
<.01%@+20dBu
<.01%@+20dBu
IM Distortion (SMPTE)
Output Hum & Noise (unweighted)
<.01%@+20dBu
-95dBu
<.01%@+20dBu
-93dBu
>85dB @ 1Khz
>95dB @ 1Khz
- to +6dB
- to +6dB
Constant Q/Wein Bridge
Constant Q/Wein Bridge
Frequency Response
Channel Separation
Gain Control
Filters
Type
Number
Bandwidth
Tolerance
Range
Subsonic Filter
Power Requirements
Nominal Voltage
Power
2x15
2x31
2/3 Octave
1/3 Octave
±3%
±3%
±15dB
18dB/Octave @ 40Hz
+/-6 dB, +/- 15 dB (switchable)
12dB/Octave @ 14-280Hz
100-240 VAC (50-60 Hz)
30W
Physical
Shipping Weight
Dimensions
14 lbs
17 lbs
19”Lx3.5”Hx8”D
19”Lx5.25”Hx8”D
Copyright© 2007 – Ashly Audio Inc.
Operator Manual – GQX Series Equalizers
Page - 11
Introduction
Safety
Instructions
-2
–3
Limited Warranty
The PE Series
Introduction
- 4- 3
Warranty service for this unit will be provided by ASHLY AUDIO INC. in accordance with
the following warrant statement.
ASHLY AUDIO INC. warrants to the owner of this product that this product and the
components thereof, will be free from defects in workmanship and materials for a period of
FIVE years from the date of purchase. ASHLY AUDIO INC. (ASHLY AUDIO) will,
without charge, repair or replace, at its option, defective product or component parts upon
prepaid delivery to the factory service department or authorized service center, accompanied
by proof of purchase date in the form of a valid sales receipt. This warranty gives you
specific legal rights, and you may also have other rights which vary from state to state.
EXCLUSIONS: This warranty does not apply in the event of misuse, neglect or as a result of
unauthorized alterations or repairs. This warranty is void if the serial number is altered,
defaced, or removed. ASHLY AUDIO reserves the right to make changes in design or make
additions to or improvements upon this product without any obligation to install the same on
products previously manufactured.
Any implied warranties which may arise under the operation of State law shall be effective
only for FIVE years from the date of purchase of the product. Ashly Audio shall be liable only
to correct defects in the product itself, and not for any damage or injury which may result from
or be incidental to or a consequence of such defect. Some states do not allow either limitations
on how long an implied warranty lasts, or the exclusion or limitation of incidental or
consequential damages, so the above limitations or exclusions may not apply to you.
Obtaining Warranty Service in the United States
For warranty service in the United States, please follow this procedure:
Return the product to Ashly, freight prepaid, with a written statement describing the defect
and application the product is used in. Ashly Audio will examine the product and perform
any necessary service, including replacement of defective parts, at no further cost to you.
Ship your product to:
Ashly Audio Inc.
Attn: Service Department
847 Holt Road
Webster, NY 14580-9103
For units purchased outside The United States of America, service will be provided by an
authorized distributor of ASHLY AUDIO INC.
Obtaining Warranty Service Outside the United States For units purchased outside The
United States of America, service will be provided by an authorized distributor of ASHLY
AUDIO INC.
All Rights Reserved
Physical
GQX
Equalizers
Description
–5 -4
Installation –&5Cables – 5
Connectors
OperationDescription
Physical
–7
-6
Troubleshooting
Installation
–7 -8
Spec Table
Typical
Applications
-9
-8
Measurements - -109
Troubleshooting
Dimensions - 11
9
Warranty - 12 - 10
Specifications
Warranty - 11
Copyright© 2007 – Ashly Audio Inc.