Ashly GQ-231 User's Manual
Contents
1. iii eit ee hen Ashly set out to design the GQ Series we first thoroughly re examined the accepted prin ciples of graphic equalization Extreme accuracy and ease of use combined with Ashly s l 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 switchable 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 rerep eger a DE A TE SE gt ua 7 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 detented flat center position the filters go off2. A TATI f glo e gt iy E PETTA Bele ie Lgr I hf 0 Architect s Specification GQ 215 The graphic equalizer shall be stereo 2 channels Each channel shall consist of 15 bands centered on standard 150 frequencies at intervals of 2 3 octave and covering a frequency range of 25Hz to I6kHz Individual bands shall be activated by linear slide faders with a 45mm travel metal actuator shafts and a tactile center detent The range of equalization per band shall be 15dB The equalizer shall have a gain of unity with all sliders centered and shall have a maxi mum in out level of 20d BV Frequency response shall be 25dB LOH to20kHz Hum and noise shall be at least 97dBV and SMPTE intermodulation distortion or THD shall be less than 01 at full out put Input impedance shall be ZOKO balanced LOKQ unbalanced Output impedance shall be 2000 Inputs and outputs shall be active transformerless balanced type on both XLR and 1 4 phone jacks Individual filters shall be Wein bridge type and connected in a sum ming circuit optimized for minimum filler interaction and constant bandwidth at any slider setting Boost and cut characteristics shall be fully symmetrical with the filter being electrically removed from the circuit in the center flat position Individual filters shall be accurate to within 2 of indicated center frequency and shall be non adjustable to insure long term accuracy The equalizer shall also include a 12
3. level of 26dBV Frequency response shall be 25dB 10Hz to20kHz Hum and noise shall be al least 97dBV and SMPTE intermodulation dis tortion or THD shall be less than 01 at full output Input impedance shall be 44k balanced 22KO unbalanced Output impedance shall be 2000 Inputs and outputs shall be active trans formerless balanced type on both XLR and 1 4 phone jacks Individual filters shall be Wein bridge type and connected in a sum ming circuit optimized for minimum filter interaction and constant handwidth at any slider setting Boost and cut characteristics shall be fully symmetrical with the filter being electrically removed from the cireuil in the center flat position Individual filters shall be accurate to within 2 of indicated center frequency and shall be non adjustable to insure long term accuracy The equalizer shall also Include an 18d6 per octave high pass filter tunable from 8Hz to 200Hz equipped with a bypass switch A 3 color bar graph meter shall be employed to show overall output level and an LED indicator shall show overload conditions Input gain shall be adjustable over a range of 150B and an overall EQ bypass switch shall be included The equalizer shall weigh 13lbs net and mount in a standard 19 rack using 3 spaces 5 25 high The power requirement shall be 110 1I5VAC 50 60Hz 20W The unit shall be an ASHLY AUDIO GQ 231
4. 6 per octave high pass filter at 40Hz equipped with a bypass switch An LED indicator shall show overload conditions Input gain shall be adjustable over a range of t15dB and an overall EQ bypass switch shall be included The equalizer shall weigh 9 5 Ibs net and mount in a standard 19 rack using 2 spaces 3 5 hith The power requirement shall be 110 115VAC 50 60Hz 12W The unit shall be an ASHLY AUDIO GQ 215 Ashly Audio Inc GQ 131 The graphic equalizer shall be monoaural 1 channel It shall consist of 31 bands centered on standard 150 frequencies at intervals of 1 3 octave and covering a frequency range of 20Hz to 20kH2 Individual bands shall be activated by lincar slide faders with a 45mm travel metal actuator shafts and a tactile center detent The range of equal ization per band shall be either 6dB or 15dB selected via a 2 posi lion switeh The equalizer shall have a gain of unity with all sliders centered and shall have a maximum in out level of 26dBV Frequency response shall be 25dB 10Hz to20kHz Hum and noise shall be at least 97dBV and SMPTE intermodulation distortion or THD shall be less than 01 at full output Input impedance shall be Ak balanced 22k0 unbalanced Output impedance shall be 2000 Inputs and outputs shall be active transformerless balanced type on both XLR and 1 47 phone jacks Individual filters shall be Wein bridge type and connected in a summing circuit optimized for minimum filter intera
5. 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 five year worry free warranty Graphic Equalizers models GQ 215 GQ 131 GQ 231 Ogi Specifications INPUT Typ e mpedance M ax LEVEL FA Type Min Load Impedance Max Level Tata a Va a Frequency Resp onse l i l B l kj 0 id i J m 5 vI P p 3 THD 20Hz 20kr Equivalent Input I a ee a by et a O j m Pa a A nn Constant Q Wein Bridge Ee A Number CD oe FE a Danawiain lolerance subsonic Filter Power Require g m i ia 1 TEES a onipping Weight imensions ry Beralelal ah ten a E Sar Sr HECLOTI w La 1 3 Ol oy ave Balanced ee iio iT Pa re os L A Fari j Abd V Bala in N ced 6000 L C Ii i 1 E rn j i
6. ction and constant bandwidth at any slider setting Boost and cut characteristics shall be fully symmetrical with the filter being electrically removed from the circuit in the center flat position Individual filters shall be accurate to within 2 of indicated center frequency and shall be non adjustable to insure long term accuracy The equalizer shall also include an 18dB per octave high pass filter tunable from amp Hz to 200Hz equipped with a bypass switch A 3 color bar graph meter shall be employed to show overall output level and an LED indicator shall show overload conditions Input gain shall be adjustable over a range of 15dB and an overall EQ bypass switch shall be included The equalizer shall weigh 9 5 Ibs net and mount ina standard 19 rack using 2 spaces 3 5 high The power requirement shall be 110 115VAC 50 60Hz 12W The unit shall be an ASHLY AUDIO GQ 131 Since 1972 1990 Ashly Audio GQ 231 The graphic equalizer shall be stereo 2 channels Each channel shall consist of 31 bands centered on standard ISO frequencies al intervals of 1 3 octave and covering a frequency range of 20Hz to 20KHz Individual bands shall be activated by linear slide faders with a 45mm travel metal actuator shafts and a tactile center detent The range of equalization per band shall be either 6d6 or 15dB selected via a 2 position switch The equalizer shall have a gain of unity with all sliders centered and shall have a maximum in out
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