Ashly GQ-231 User Manual

ASHLY
GQ-131
Graphic Equalizers

models GQ-215, GQ-131, GQ-231

Five-Year
Worry-Free Warranty
Detented Metal-Shaft
Fader with Saddle Knob
Precision Wein-bridge
Filters for Accurate
Response and
Low Distortion
Constant "Q" Design
with Low Ripple and
Accurate Response
GQ-231
I hen Ashly set out to design the
GQ-Series, we first thoroughly re-examined the accepted prin ciples of graphic equalization. Extreme accuracy and ease­of-use, combined with Ashly's
1
renowned clean, straightfor
ward engineering and design, produce a series of graphic equalizers that can truly be called the "next generation."
There are three models available in the GQ Series. The GQ-215 offers two chan nels of 2/3-octave, 15-band equalization and features a peak-indicating LED, a fixed, swifchable 40Hz subsonic filter, and a cut or boost range of ±15dB. The GQ-131 is a mono 1/3-octave, 31-band equalizer, incorporating a switchable sub sonic filter that is tunable between 8Hz and 200Hz, and a boost or cut range of either ±6dB or ±15dB. Additionally, a nine position, three color LED level meter and a peak-indicating LED are provided for visual reference. The GQ-231 has two separate channels of 1/3-octave, 31-band equalization, each incorporating the same features as the GQ-131.
Ashly's innovations in the GQ-Series are numerous: New Op-Amps, with high slew-rate circuitry for the length of the sig nal path, turn out a clean and virtually noiseless, transparent sound. A unique summing system, with low-noise ampli fiers, is utilized, allowing minimum ripple and filter interaction. At the detected "flat" center position, the filters go off-circuit for an extremely accurate flat response and absolute minimum noise. There is no broadening at all near the flat setting.
Our new Q-enhanced Wein-bridge fil ters are vastly superior to typical R-L-C and simulated inductor types. Construct ed of precision metal-film resistors and polyester capacitors, they produce an ideal curve shape and precise center fre quencies with low distortion.
Finally, a unique T-beam front panel construction eliminates interconnections between the faders and filters, resulting in a graphic equalizer with genuine Ashly innovation, reliability and sonic quality. The GQ Series, like all Ashly products, is now fully covered by our exclusive five­year worry-free warranty.
Near the "Flat" Setting
Selectable 15dB or
6dB range
(on 31-Band Models)
Switchable-Tunable
Low-Cut Filter
(Switchable 40Hz Fixed on GQ-215)
9-Position, 3-Color
LED Level Meter (on
31-Band Models) Plus
Peak LED Indicators
Balanced XLR and
Unbalanced 1/4" Inputs
and Outputs
Specifications
INPUT
Type:
Impedance:
Max. Level:
OUTPUT
Type:
Min. Load Impedance:
Max. Level:
Frequency Response:
IM Distortion (SMPTE):
THD (20Hz-20kHz):
Equivalent Input Noise
(20Hz-20kHz):
FILTERS
Type:
Number:
Bandwidth:
Tolerance:
Range:
Subsonic Filter:
Power Requirements:
Shipping Weight:
Dimensions:
I/O Connectors:
0

GQ-215

Balanced
20kU
+20dBV
Balanced
600П
+20dBV
±.25dB 20Hz-20kHz
<.01%@ +20dBV <.01%@+20dBV
-97dBV
Constant Q/Wein-Bridge
2 X 15
2/3 Octave
±2%
±15dB
12dB/Octave @ 40Hz
120VAC, 50-60HZ, 12W
10 lbs
19"Lx3.5"Hx6"D
XLR and 1/4"

GQ-131

Balanced
44kii
+26dBV
Balanced
60oa
+26dBV
±.25dB 20Hz-20kHz
<■01% @ +20dBV <.01% @ +20dBV
-97dBV
Constant Q/Weln-Bridge
31
1/3 Octave
±2%
±6/15dB ^
12dB/Octave, 6-200Hz
120VAC, 50-60HZ, 12W
10 lbs
19"Lx3.5"Hx6"D
XLR and 1/4"

GQ-231

Balanced
44kii
+26dBV
Balanced
600U
+26dBV
±.25dB 20Hz-20kHz
<.01%@+20dBV <.01%@+20dBV
-97dBV
Constant Q/Wein-BrIdge
2X31
1/3 Octave
±2%
+6/15d В
12dB/Octave, 8-200Hz
120VAC, 50-60HZ, 12W
15 lbs
19"Lx5.25"Hx6"D
XLR and 1/4"

GQ-215

The graphic cqualiiwr shall be stereo [2-channcls)- Each chanml shall consist oi 15 bonds centered on standartl ISO Frequencies at intervals of 2/3 octave aixl covering a ircqucncy ratìge of 251 Iz to
16кНг. Individual bands shall be activated by linear slide faders with a 45min (ravel, melai actuator shafts and a lacltlc center detent. The range of equalization per band shall be ±l5dB. The equalizer shall lijKt a gain of unity with aD sliders centered, and shall have a maxi­mum in/out level of ■t-20dBV. Frequency response sitali be 2.25UD
lOHz to20kllx. Klim ami noise shall be at least -97dDV and SMITE Inlermodulatlon dtsicrtion or THD shall be less than .01% at ГиД out put. Input impedance shall be 20kti balanced, lOkll unbalanced. Oiiiput Impcdmire shall be 200Ì1. Inputs and otilpucs shall be active (transformerless) balanced type on both XLR and I /4' phone Jacks. Individual fillers shall be Weln-brtdge type and connected In a sum ming circuit optimized for mlnltmim filter inlcraetion and constant bandwidth at any slkler setting. Boost and cut characterlsUcs shall be fully symmelrlral. with the filter being electrically removed from the circuit in the center [fiat] pesUion. Indhidual fillers shall be accurate to within 2% of iiidicaled center frequency and shall be non­adjustabk to Insure Imif:; term accuracy. The equalizer shall also Include a 12rlR per octave high pass filter at 40Hz. equipped with a bypass switch. An LED indicator shall show overload conditions. Input gain shall be adjustable cA'cr a range of tlSdfì. and an overall EQ bypass switch shall be iiwludcd.Thc equalizer shall weigh 9.5 lbs net and mmmt In a standard 19' rack using 2 spaces (3.5' high). The power requirement shall be 1)0-115VAC. 50-60Hz. 12W. Tbe unit shall bean ASKLYAUDIO GQ-215.
Ashly Audio Inc.

Architect's Specification

GQ-131

Tile graphic equalizer shall be monoaural 11 rhnnnrl). It shall consist of 31 bands centered on standard ISO irequenefes at Intervals of 1/3 octave and covering a frequency range of 201 tz to 20kKz. Individual bands shall be activated by liiKar slide faders with a 45nim travel, metal actuator shafts and a laellle center clelent. Tbr range of equal ization per band shall be cither ¿€dB or il5dD selected \ia a 2-posl­lion switch. The equalizer shall have a gain of unity with all sliders centered, aixl shall have a maximum In/oul le\*el of 426dBV. Frequency response shall be :.25dB lOHz lo20kHz. Hum and nrHsc shall be at least -97dBV and SMPTE Intermodulaikm distortion or Т1Ш shall be less tlian ,01% at full oulpul. Input Impedance shall be 44kD balanced. 22klJ unbalanced. Output Impedance shall be 20ffi}. Inputs and outputs sitali be active [iransformerlcsvsj halanred type on both XLR and I/4" phciic jacks. Individual fillers shall be \Veln-bridge type and coniieded in a summing circuit optimized for minimum filler interaction and constant bandwidth a( ai^' slkler setting. Boost ami cut characteristics shall be fully symmetricai. with the filter bcti^ electrically rcnto\*cd frotn the circuit in the ccnlCT (flat) position. Indiildual filters slull be accurate to within 2% of indicated center
frequency and shall be non-adjuslable to Insure long term accuracy, The equalizer shall also Include an iSdB per nclair high pass filter tunable from 8Hz to 200Hz. equipped with a bypass switch. Л 3 color bar-graph meter shall be employed to show overall output Icwl and an LED Indicator slial) show overload conditions. Input gain shall be adjustalile ewer a range Ы* tI5dB. and an overall EQ In-pass switch shall Ы indudcd.The equalizer shall weigh 9.5 lbs net and mount In a standard 19' rack using 2 spaces |3.5* high). The power requirement shall be 110-115VAC. 50-60Hz. I2W. The unit shall be an ASHLY AUDIO GQ-131.

GQ-231

The graphic equalizer sliall be stereo |2 channels). Each channel sliall consist of 31 hands centered nn standard ISO frequencies at intervals of I /3 octave and covering a frequetKy^ range of 20Hz to 20kHz. Irtdhldual bands shall be activated by linear slide faders wltli a 45mm travel, metal actuator shafts and a tactile center detent. Ilie range of equalization per band shall be either ±6dB or i 15dB selected via a 2-posilion switch. The equalizer .shall Itave a gain of unity with all sliders centered, and shall have a maximum in/oul level of
■»26dBV. Frequency response shall be ±.25dB lOHz lo20kKz. Hum and ndsc sliall be at Irast -97dHV and SMPTE Itilermodulallcm dis tortion or THD shall be less tlian .01% at full output. Input tinpedanre shall bo 44kil balanced. 22kfl unbalanced. Output Impedance shall be 20011. Inputs and outputs aluill be active [Inuis­formcrlcss) balanced hpr on both XIJI and 1/4* phorw [ocks. liKlividual filters shall be Weln-brfdge type and connected in a sum ming circuit optimized for minimum filter Interaction and constant bandwidth at any slkler setting. Boost and cut characteristics sliall be fully symmetrical, with Ihe filter being electrically rcmo\’cd from the circuit in the center (Flail position. IndMdual flllrrs shall be accurate to within 2% of indicated center frequency and sliall be iiai­odjustabk to insure long term accuracy. T|w equalizer shall also Include an l8dB per octave high pass filter lunabk from 8Hz to 2O0liz. equipped with a bypass switch. A 3 color bar-graph meter shall be employed to show overall output k’v'cl and an LED indlcaior shall show* overload coiKlitions. Input gain shall be adjustable mrr a range of :l5dB. and an overall EQ liypass switch shall be included. The equalizer shall weigh )3lbs net and mount in a standard 19' rack using 3 spaces (5.25" hlgh|. The power requirement shall be 110-
115VAC, 50-601 Iz, 2CW. Hie unit shall be an ASHLY AUDIO OQ-23!,
Since 1972
© 1990 Ashly Audio
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