Peavey EQ-27 User's Manual
Contents
1. will allow maximum gain belore acoustic feedback or to correct deficiences in the room speaker systems Again all adjustments shouid be begun from the center or detent position As the equalization process continues relative loudness levels can be restored using the level contro It is always wise to avoid excess ve cutting of large segments of the audio passband since this tends to reduce the overall dynamic range ol the system Also it is better 1o raise the input level control slightly rather than use a majority of the equalizer sliders in the boosi position since a better signal to noise ratio will result NOTE IF YOU ARE USING THE EQUALIZER iN AN APPLICATION WITH MARGINAL HEADROOM INADEQUATE POWER CAPABILITY IT IS QUITE POSSIBLE THAT YOU WILL FORCE YOUR POWER AMPLIFIER INTO CLIPPING WHEN LARGE AMOUNTS OF EQUALIZATION ARE USED PLEASE REMEMBER THAT 15 dB OF BOOST IS EQUIVALENT TO MULTIPLYING A VOLTAGE BY A FACTOR OF 5 62 OR A POWER BY A FACTOR OF 31 62 AS AN EXAMPLE IF YOU ARE USING A POWER AMPLIFIER THAT IS DELIVERING 100 WATTS AT A FREQUENCY OF 120 Hz AND YOU BOOST THAT FREQUENCY 15 dB THE POWER AMPLIFIER WILL BE CALLED UPON TO DELIVER A POWER OUTPUT OF OVER 3 100 WATTS SPECIAL NOTE There is no cookbook method that will be totally satisfactory in the adjustment of the EQ 27 to correct room and or system response deliciencies As with any reasonably sophisticated device a good understanding and some degree of experience and experi2. E OCCASIONAL PEAK POWER ADEQUATE POWER HEADROOM HAS BEEN DESIGNED INTO THIS SYSTEM EXTENDED OPERATION AT ABSOLUTE MAXIMUM POWER LEZELS I NOT RECOMMENDED SINCE THIS COJLD DAMAGE THE ASSOCIATED LOUOSPEAKER SYSTEM PLEASE BE AWARE THAT MAXIMUM POWER CAN BE OBTAINED WITH VERY LOW SETTINGS OF THE GAIN CONTROLS FF THE INPUT SIGNAL IS vtt STRONG Raed at anfety and operateg vtnicmons belor ung ts amp Connect ory t pow Supply 0f The ype marved on The ivt 13 Care shair be ien so af oh ecta do nol Tal and leurs ma power mpy cont product sdjeceni to the 2 An solet anc opeeating insirsctions thoid be retenen for Never dreak oif 19e ground pn on tha power owe Fo m spini into The unt Nrough The ventiaton Poles or any tuture terme Obey ai cautions the ope ang inshuchons aed on ihe heck of ine on A Operating instrctiums shat bs loliowued The product sfouks nor Sw vesd near wafer i a b9tub un mwimimong pool wet been etc h This product shout be located 0 thot 49 poution dore not irterfers miih As proper ventiation l samat not te placwd Net agensi b wat or placed n a tuit ir enciam Thai will mptae rhe Pow of cooing si more inhormation on grouting write for our fee booniet Shoma Hawt and Gorang Power supoly conde shouid sways be handled cantum Never walh or pace equipment or power suppiy cord Peci dicaly chace corda to cuts or gine of arta especisiy a Me pug ang re pont where The cord exits the unt The pree vipply core sho4ld be egh
3. WARNING TO PREVENT ELECTRICAL SHOCK OR FIRE O HAZARD DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE BEFORE USING THIS APPLIANCE READ BACK COVER FOR FURTHER OPERATING GUIDE WARNINGS d GENERAL DESCRIPTION The P ctave apart throughout the audio range Each ind constructed of pr that often band equalizer with t x3 the latest mput he use o trimmers avey E P 3use probier separate slider th most 3mpatible v LR and balan a available All outputs and puts h the art voltage requiator circumny will le transient free power up and power sient over vi de a stable r conditions ve ntrol allows 15 dB of qain t re average sS switch allows the egualizer to be moved trom th ipability of providing areater thi 6 dBm int The EQ je 181 wgl opr de tu t well as a durable package to withs ith The extreme flexibility afforded by tht f xiri ely wide rangi igr mpedance levels coupled with its except n today s mark INSTALLATION AND ADJUSTMENT The EQ 1 accep 1 ac s The unit must be se t omponents that 271 f are placed in accordance with rame tor optimum mechanical affected by extemally generated liability and useful service lite the S 5 fields from power transformers sinc unit should not be subjected to ext iv jum tube power amp or other high Op atng temperature equipment Heal de ec and shorten component lifetime Neither should this unit be exposed to the elements or be utilized in a s
4. eatures and specifications listed herein are subject to change without notice THE FOLLOWING SPECIFICATIONS MEASURED AT 1 VOLT RMS EQ IN ALL CONTROLS FLAT FREQUENCY RESPONSE 1 dB 20 Hz 30 KHz TOTAL HARMONIC DISTORTION Less than 00896 20 Hz 20 KHz at unbalanced output typically less than 005 at 1 KHz Less than 059 20 Hz 20 KHz a balanced output typically less than 005 at 1 KHz HUM AND NOISE Greater than 90 dB below 1 volt RAMS output at either output 20 Hz 20 KHz unweighted input unterminated typically 95 d8 below 1 volt RMS s PEAVEY ELECTRONICS CORPORATION 711 A Street Meridian MS 39301 U S A 1982 Printed in U S A 20361050 Ta
5. end of the distribution OPERATION Operation of the EQ 27 is more or less straightlorward and shouid present no major difficulty to the user Generally one should set up the various compcnents in the audio chain and adjust the inputs and outputs of Ihese devices to provide proper matching of impedances anc ievels During the initial setup the EQ 27 should be connected into the system with the individual filter sliders in the center detent position Once the mixers power amps etc are plugged in and the EQ 27 s gain control is set to unity cain the equalizer filters can be activated by moving the IN OUT switch from the bypass position io the in position ALL EQUALIZATION SHOULD START WITH THE SLIDERS IN THE 0 CENTER OR DETENTE POSITION The proper settings of the EQ 27 may be arrived at in several different ways with the mos preferable being through the use of a property designed and utilized real time frequency response analyzer Most real time analyzers utilize standard ISO frequency centers as does Ihe EQ 27 and will generally provide the most accurate settings The individual sliders controlling the 27 filters should be set to produce the desired response on the scale of the real time analyzer Should a real time analyzer and noise generator not be available the EQ 27 may be set experimentally by first matching the gains between the various elements ofthe system and adjusting each of the 27 frequencies until the proper balance is found that
6. mentation are necessary to achieve the proper results Extreme caution should be usedin overboosting or overcutting any range segment of the overall audio range since this can lead to many problems with signal to noise ratio headroom etc DANGEA UXPOSUME TO EXTREMELY HIGH NOISE LEVELS MAY CAUSE A PERMANENT HEARING LOSS INDIVIDUALS VARY CONSIDERAI Y IN SUSCEPTIBILITY TO NOISE INDUCED HEARING LOSS AUT NEARLY EVERYONE WILL LOST SOME HEARING IF EXPOSED TO SUFFICIENTI Y INTENSE NOISE FOR A SUFFICIENT TIME THE US GOVERNMENT S OCCUPATIONAL SAFETY AND HEALTH ADMINISTRA TION OSHA HAS SPECIFIED THE FOLLOMNO PERMISSIBLE NOISE LEVEL EXPOSURES DURATION PER DAY IN HOURS SOUNO LEVEL dBA SLOW RESPONSE 6r t ACCORDUMG TO OSHA ANY EXPOSURE IN EXCESS Of TH ABOVE PERMISSIBLE LIM TS COLALO RERA T IN SOME HEARING LOSS EAA PLUGS OR PROTECTORS IN THE EAR CANALS OPI OVER THE EARS MUST BE WORAN WHEN OPERATING THIS AMP IFICATION SYSTEM IN ORDER TO REVENT A PERMANENT HEAHING LOSS I EXPOSUME i IN EXCESS OF THE UMITS AS SET FORTH ABOVE TO SUAE AGAINST POTENTIAL Y DANGEROUS CXPOSUNE TO ISOH SOUND PRESSURE LEVELS 1T I RECOMMENDED THAT ALL PERSONS EXPOSED TO EQUIPMENT CAPABLE OF PROOUCING HIGH SOUND PRESSURE LEVELS SUCH AS THIS AMPLIFICATION SYSTEM BE PROTECTED OY HEARING PRCOTECTORS WHILE THIS UNIT 16 IN CPSRATSON Tit QRAPH C EQUA ZERMHAS BEEN DESIGNED AND CCNSTRUCTED TD PROVIDE AQE QUATE POWER RESERVE FON PLATING MOOEAN MUSIC WHICH MAY REQUE OCCASHONAL PEAK POWER TO HANDL
7. ogget when the uns is in be unused ioi long periode ni hime Meisi parih ca amp te Cwaced wih a damp rag The nyi cavenng ued on arme unit can be cliacmo wh a damp rac o an arremons base houiehoid coena i necessary LI Tha unt Mio De checued d 9 quaifie serica Iachnocsen E A The power supply cord or pug as been damaged B Aeyth mg has Wian oc been ipiied into Me urit C The unit Goes not o ee Corectiy OD Te unit has been dropped or the enclose maga Yu ute Should not aYemglt ho senos thia equipment AU serico wort ah ou d be dones Dv a qualified sers ice twrhnicuan This product mouia not be placed ear a sovrse 0f heut such am s sowe hosie sofistas another hast producing ampi er GAIN Balanced or unbalanced input to balanced or unbalanced output EQ IN 15 dB unity gain at 0 dB level setting EQ OUT Unity gain unaffected by level control INPUT IMPEDANCE 20K ohms unbalanced at phone jack 30K ohms balanced at XLR connector INPUT DYNAMIC RANGE 18 volts RMS 25 dBv maximum OUTPUT SOURCE IMPEDANCE 10 ohms unbalanced 600 ohms balanced OUTPUT LEVEL volts RMS into 10K ohms 17 dBv 5 volts RMS into 600 ohms 16 dBm EQUALIZATION 12 d8 at 40 Hz 50 Hz 63 Hz BO Hz 100 Hz 125 Hz 160 H2 200 Hz 250 Hz 315 Hz 400 Hz 500 Hz 630 Hz 800 Hz 1 KHz 1 25 KHz 1 6 KHz 2KHz 2 5 KHz 3 15 KHz 4 KHz 5KHz 6 3KHz 8 KHz 10 KHz 12 5 KHz and 16 KHz Due to our efforts for constant improvement f
8. ystem where it may be exposed to liquids spilled int the slider p f f openings NOTE ALL SIGNAL CONNECTIONS MADE TO THE GRAPHIC EQUALIZER MUST BE MADE USING SHIELDED CABLES R d r t cations the XLA input should be f the XLR connectors are not chieve a balanced input using used the inpi nomatically aving a very low output ticeable loss 1 phone inputs In mos ssional app actronically balance The graphic equalizer has a matter of ir bie al the mixer phone jack as converts to an unb mpedance This ir is superior loads to 16 dBm or the use of very long e can be used with very ittie signa onfiquratior are low impedance s or less ut is provided from c d XLRr ntorcement appicci r hum and noise pickup J studio or home stereo apg i f tt jan Outf im The two paratle phone jack ie pri 1 f t T r Ju tput m the Cc equalize notent your f I ter nd re s This no iution exist ali eq t t yt f r n Whe r Inr e right and S ble to create a g bete t xir f iti ated a y between the Ives jt 1 hi q r ex the best cure is to eliminate the ground loop by C teed for the i px 1mps tr f b un an A C feed forthe console and all uq nt et teed both power amplitiers irom thi CAUTION DO NOT REMOVE THE THIRD WIRE GROUND PIN FROM YOUR A C LINE CORDS THIS IS NOT A SAFE FIX FOR A C GROUND LOOPS IF NECESSARY USE A SUITABLE PLUG ADAPTOR AND GROUND THE GREEN WIRE i 1 T niy possit i completely bal ystems employed at each
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