YAHAMA GQ1031 Manual
Contents
1. YAMAHA 31 BAND GRAPHIC EQUALIZER GQ1031 Operation Manual a GRAPI Congratulations on your purchase of a Yamaha GQ1031 31 Band Graphic Equalizer Your GQ1031 is a 1 3 octave graphic equalizer that will give you precise response control over virtually any audio signal for a wide variety of applications To ensure that your GQ1031 gives you optimum performance be sure to read this manual thoroughly before attempting to operate the unit CONTENTS PRECAUTIONS 23 ra 3 0 9 bed denne era adel dee Baie ee d 2 CONTROLS amp CONNECTION 3 4 APPLICATIONS ccc ee el site Dator S 5 BLOCK DIAGRAM 6 DIMENSIONS ani amp are eer CA eee ee Dn 6 SPECIFICATIONS 7 PRECAUTIONS e Avoid placing the unit in locations exposed to direct sunlight or high temperatures excessively high or low humidity high dust concentration or vibration e Be sure to connect to an AC power supply that meets the power supply specifications listed on the rear of the unit e If there is any danger of lightning occurring nearby remove the power plug from the wall socket in advance To avoid damaging your speakers and other playback equipment turn off the power of all related equipment before making connections Do not use excessive force in handling control switches and knobs 9 To avoid broken cords and short circuits be sure to unplug all con2. mance sound check 4 Creative Equalization In this application the equalizer is actually used as a creative tool rather than for compensation or control The GQ1031 can be used with musical instruments to emphasize certain tonal qualities they possess or to create a totally new sound The graphic equalizer is extremely versatile in recording situations as well Some careful equalization can make the sounds of different instruments blend together more smoothly or create a number of different tonal moods If this is you re main application you ll find that the ways you can use a versatile equalizer like the GQ1031 are virtually unlimited BLOCK DIAGRAM BUFFER SUBTRACTOR SN I I 7 lo o l INPUT EQ I OUTPUT L swl INPUT I ae ease ee a a J Nominal Input Output Level 10dB Level 10dB g DIMENSIONS E 0 R 428 16 7 8 2 i EI N 1 a z Si e S et amp Si O ap 4 N N ht N N 9 N tL 1 3 4 a ca A WH eo 360 14 1 8 60 2 3 8 SE 2 378 Units mm inch SPECIFICATIONS FREQUENCY RES 1dB 1dB 20Hz 20k Hz 10dB EQUALIZATION PONSE all Equalization Controls at flat CONTROL TOTAL HARMONIC Less than 0 005 1kHz 0dB Center Frequencies DISTORTION all Equalization Controls at flat NOISE LEVEL Less than 100dB IHF A 0dB all Equalization Controls at flat GAIN OdB INPUT LEVEL Control at max imum a
3. necessary equipment such equipment can often be rented at a nominal charge But for general sound reinforcement and many other situations the equalization can be carried out by ear The only requirement is that you have a familiar source a record or tape that can function as a reference You know how your reference source should sound and you adjust the equalizer until you achieve that sound Listening with a pair of top quality headphones can also be a useful guide to how the source should sound without the affects of room acoustics This type of equalization requires some practice since you ll need to be able to roughly evaluate response by ear 2 Feedback Control This is primarily a sound reinforcement application since it is in this field that feedback problems generally occur Feedback normally occurs when the sound from a speaker finds its way back into the amplification system via a microphone The sound picked up by the mic is re amplified and picked up by the mic again causing the electro acoustic feedback system to oscillate at its natural resonance frequency A microphone too close to a stage monitor or house speaker can cause feedback and the most effective solution is the relocate the microphone or speaker so that the feedback path is lengthen ed so that the signal picked up at the mic is too small to cause feedback If relocation of the sound source and pickup does not solve the problem however graphic equal
4. alleled and have Le a source impedance of 1 k ohms APPLICATIONS The GQ1031 offers a full 31 bands of equalization permitting extremely fine control over the frequency response of any audio signal This capability is particularly useful in various applications A few of the possibilities are as follows 1 Room Equalization The sound of any playback system be it a home stereo or a huge sound reinforcement system will vary greatly when used in different rooms Of course the room could be a living room recording studio theater concert hall or colosseum This is because each room has its own characteristic acoustic properties which affect the sound Some parts of the room will reflect sounds at certain frequencies while others will absorb specific parts of the audio spectrum in varying degrees The result is that even though the frequency response of your playback system may be quite flat the sound that reaches the listener s ears may not be A graphic equalizer like the GQ1031 can compensate for this problem producing a flat acoustic response in any environment For really accurate response compensation in this type of application some measuring equipment will be necessary a spectrum analyzer with a pink noise signal source or sound level meter with a warble tone signa source If your equaliza tion requirements are critical as they would be in a recording studio control room we recommend that you acquire the
5. exceeds 17 dB warning of overload distortion Since equalizing a signal can also affect its overall level the INPUT LEVEL control can aiso be used to match the levels of the equalized and bypassed unequalized sound With proper equalization technique however this should not be necessary ain SSE a aaa EEE EEE SE TA SRST AEST Equalization Controls These are the actual equalization controls 31 bands of equalization are provided at standard ISO 1 3 octave frequencies 20 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 6 3k 8k 10k 12 5k 16k and 20 kHz Each band can be boosted or cut by up to 12 dB Boosting a band by moving its control toward the end of the scale increases the level of the selected frequency band while cutting or attenuating a band by moving its control toward the end of the scale decreases the level of the selected frequency band yy RESPONSE dB Op o aa 20 so 100 200 bial ik a 5k Io So FREQUENCY Hz INPUT Connectors Both a standard mono 1 4 phone jack and RCA pin jack are provided These connectors are internally paralleled and present a load impedance of 22 k ohms to the input signal OUTPUT Connectors Both a standard mono 1 4 phone jack and RCA pin jack are provided These connectors are internally par
6. ization can do the trick Simply if the gain of the system at the feedback frequency is reduced the feedback can be stopped Start by applying maximum cut attenuation to the frequency bands at which the feedback is likely to be occuring one band at a time Eventually you ll find the control that stops the feedback Now gradually increase the level of that band until the feedback starts again then decrease the level to about 2 or 3 dB below the level at which the feed back stops this is the optimum feedback control setting You might find that feedback is occurring at two or more frequen cies in a complex setup In this case each frequency must be treated in the same way 3 Sound Reinforcement Monitor Equalization A GQ1031 inserted between the line level feed from each monitor output of a sound reinforcement mixer and the corresponding monitor amplifiers can be useful in providing the most effective monitor sound Particularly when a lot of amplified instruments are being used on stage the monitor sound can become muddy and unintelligible The equalizer can be used to tailor the monitor response so it cuts through all the on stage noise A vocalist is generally able to hear him or herself better for example if the response above 3 kHz and below about 500 Hz is rolled off leaving mainly the vocal frequency spectrum The best EQ in this application however is generally arrived at by trial and error during the pre perfor
7. nd all Equalization Controls Range of Boost Cut 31 band 1 3 octave 20 25 31 5 40 50 62 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 6 3k 8k 10k 12 5k 16k 20kHz O 12dB 0 12dB at flat PEAK INDICATOR Turn ON when the output level MAXIMUM OUTPUT More than 20dB 1kHz 0 01 reaches 3dB below 20dB clipping LEVEL THD level INPUT IMPEDANCE 22k ohms POWER REQUIREMENTS OUTPUT IMPEDANCE 600 ohms General model U S amp Canadian models 120V 60Hz 110 120 220 240 50 60Hz POWER CONSUMPTION U S amp Canadian models 10W General model DIMENSIONS W x H xD DW 480mm x 44mm x 222mm 18 7 8 x 1 3 4 x 8 3 4 WEIGHT 2 9 kg 6 4 Ibs N e OdB is referenced to 0 775V RMS Specifications subject to change without notice SERVICE The GQ1031 are supported by Yamaha s worldwide network of factory trained and qualified dealer service personnel In the event of a problem contact your nearest Yamaha dealer YAMAHA NIPPON GAKKI CO LTO HAMAMATSU JAPAN OMD 113 84122 FI Printed in Japan
8. nectors by grasping the respective plugs NOT the cords Remove the power plug from the AC mains socket if the unit is not to be used for an extended period of time Remove all plugs and connections if the unit is to be transported to prevent damage to the cords and jacks e Do not use solvents such as benzene or paint thinner to clean the unit Do not use insecticides or other pressurized spray products in proximity to the unit Wipe off the exterior with soft cloth e Be sure to have the warranty card for this product filled out by the store at which it was purchased CONTROLS amp CONNECTIONS FRONT PANEL ECH YAMAHA oc PUT LEVEL GRAPHIC EQUALIZER On 39 40 50 63 80 100 125 160 200 250 315 400 500 630 800 Ik 125k 16k 2k 25k 315k 4k D 63k Bk 10k 125k o 20kHz o fe POWER EQ a REAR PANEL CAUTION 10 prevent ELECTRIC SHOCK po WARNING TO REDUCE THE RISK Of RSERVICTABLE FIRE OR ELECTRIC SHOCK DO THIS APPLIANCE TO RAIN OR MOISTURE SADHESSER A UN REPARATEUR COMPETENT POWER Switch Press this switch to turn AC power to the equalizer ON The POWER indicator lamp located above the POWER switch will light to indicate that power is ON Press a second time to turn power OFF NOTE The GQ1031 incorporates a special power on surge protection system which bypasses the equalizer cir cuitry for approximately 2 seconds after power is turned ON even if
9. the EQ switch is ON see EQ Switch below EQ Switch This switch determines whether the equalizer circuitry is on or bypassed that is whether the input signal is routed through the EQ circuitry or directly to the output bypassing the equalizer circuitry INPUT O OUTPUT EQUALIZER CIRCUITRY EQ Switch in IN position GR YAMAHA GRAPHIC EOQUALIZER MODEL GOI 120V mm 60Hz NIPPON GAKKI CO LTD MADE IN JAPAN e NOT EXPOSE U S amp Canadian models Voltage Selector General model only The EQ indicator LED above the EQ switch will light when the EQ circuitry is ON This switch is useful for comparing the equalized and unequalized signal INPUT LEVEL Control and PEAK Indicator This control sets the sensitivity of the equalizer s input stage permitting optimum level matching with a wide range of sources With the INPUT LEVEL control set at maximum its position 10 on the scale the nominal input level of the GQ1031 is 10dB this produces a 10dB output level and the maximum input level is 20 dB producing a 20 dB output The INPUT LEVEL control can be used to increase or decrease the equalizer s input sensitivity permitting input of signals that are higher or lower than the rated level The maxi mum output level of the GO1031 is 20dB however the PEAK indicator LED lights when the equalizer s output leve reaches or
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YAHAMA GQ1031 Manual