Pyramid Technologies PEQ-60 User's Manual
Contents
1. 120 Hz controls will cause the great est percepable changes in bass response The Mid Bass approximately 140 400 Hz An over accentuated mid bass region will yield a very muddy and boomy quality to the music A system shy of mid bass will sound hollow and thin The 240 Hz control is important for good overall balance 5 sensitive to tonal balance the mid range is important in adjusting the qualitative sonic charac teristics of your system There is controversy among engineers and audiophiles as to what the proper balance should be in this range Moreover you will find some 500 Hz 1000Hz and 2000 Hz controls settings optimum for certain types of music with other settings just right for different types The Upper Mid Range approximately 2600 5200 Hz Speaker designers often boost output in this range to effect a quality of presence to the music Too much energy on the other hand sounds overbearingly harsh and strident A good balance should be achieved between this and a more muffled sound Use the 4000 Hz control for this effect The High End approximately 5200 20 000 Hz The region up to only about 12 000 Hz or so is what is normally perceived as high freequencies Adjustment in this range affects the brilliance of music with too much boost in energy yielding on unpleasant and piercing quality Most adults have hearing which rolls off rapidly above 14 000 to 17 000 Hz As a consequence the 16 000 Hz control will h2. musical sound louder the PEQ 60 can give you perfect satisfaction OPERATING OJO 2 2 4 SYRAMIO FI Studio e STEREO GRAPHIC ihe Stee eee het LEFT CHANNEL Ce eer CHANNEL ee CAUTION DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE AYAAN Studio i een 1 POWER SWITCH amp LED INDICATOR To push in the power switch for power supplied from house hold AC outlet to oper ate the equalizer and that time the LED indicator should be lighted Contrary to push out the power switch for shutting off power supply when the equalizer does not work and that time the LED indicator should not be lighted 2 FREQUENCY BOOST CUT CONTROLS Control over the response curve is accomplished by 15 slide control levels each of lefe and righ channel a total of 30 slide controllevels which permit a boost or cut of 12 dB minimum at the frequencies of 25Hz 40Hz 63Hz 100Hz 160Hz 250Hz 400Hz 630Hz 1KHz 1 6KHz 2 5KHz 4KHz 6 3KHz 10KHz 16KHz 3 LED PEAK LEVEL METER It senses audio level providing a bar like indication capability of 5LED S in 2 colors for each channel 4 EQ IN OUT SWITCH When pressed EQ effect is on PEQ60 EQUALIZEA 5 CONTROL RANGE SWITCH To Choose the frequency of Boost cut control range at 6dB 9dB or 12aB 6 LEVEL CONTROLS Located on the front panel of your Equalizer are two Variable Frequency Spectrum Level Balancing Controls s
3. PYRAMID Studio PRO 30 CONTROLS 15 BAND STEREO GRAPHIC EQUALIZER MODEL PEQ 60 OWNER S MANUAL INTRODUCTION PEQ 60 narrow band frequency balance controls provide an infinite frequency response variations to allow you matching your speakers to your room reducing or eliminating inadequacies in your high fidelity music system tailoring the reproduction of music in accordance to your choice PEQ 60 can enhance your sound system in the following ways Any system suffering from rumble or low frequency overload can be remendied by attenauting the lowermost controls of the equalizer With little in the way of funda mentals below 30Hz it is unlikely you will miss any of the music Noises due to the scratches on the record surface or even the hiss on the tape can be eleminated or reduced by bringing down the controllevel at 9 KHz Even Dolby processed tape or encoded FM Broadcasts can be compensated for the boosted highs Tonal quality of Broadcasting Stations that attenuate or accentuate either highs or lows can be equalized for pleasant listening High performance recording tapes that require special equalization in playback can be accomodated by appropriate adjust ments on the controls of PEQ 60 Phono cartridge or speaker inadequacies can be corrected for pleasant listening Find the correct slide control on your PEQ 60 and move it up or down a few dB In cases when you want to hear the vocalist or any specified
4. ave a very subtle effect It can be used to add a little more dimension to the sound or as a very high frequency noise filter SAFETY USE AND CARE INSTRUCTIONS Read Instructions All the safety and operating instructions should be read before your Equalizer is operated Water and Moisture Your Equalizer should not be used near water For example near a bathtub washbowl kitchen sink laundry tub in a wet basement or near a Swimming pool etc Ventilation Your Equalizer should be situated so that its location or position does not interfere with its prope ventilation for example your Equalizer should not be situated on a bed sofa rug or similar surface that may block the ventilation open ings or placed in a built in installation such as a bookcase or cabinet that may impede the flow of air through the ventilation openings Heat Your Equalizer should be situated away from heat sources such as radia tors heat registers stoves or other appliances including amplifiers that produce heat Power Sources Your Equalizer should be connected to a power supply only of the type described in the operating instructions or as marked on your Equalizer Cleaning The cabinet can be cleaned with a soft cloth or if necessary cleaned with a cloth dampened with water Never use polish solvents abrasives or strong detergents on the cabinet since these can damage the finish Nonuse periods The power cord of your radio should be unplugged
5. from the outlet when left unused for a long period of time Object and liquid entry Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings 6 SPECIFICATION Frequency Response Control Frequencies Control Range Harmonic Distortion at 1V output 20Hz 20KHz Hum and Noise at 1V input Shorted Intermodulation Distortion 7O0Hz 7KHz 4 1 ratio Dynamic Range 10K Ohms load Input Impedance Power Consumption Cabinet Dimension Set Weight 0 5 dB 5 Hz 100 KHz _ 10 dB 25Hz 40Hz 63Hz 100Hz 160Hz 250Hz 400Hz 630Hz 1KHz 1 6KHz 2 5KHz 4KHz 6 3KHz 1OKHz 16KHz 6 9 12 dB 0 02 gt 90 dB 0 02 8 volts RMS SOK Ohms 120V AC 60Hz 15W 220V AC 50Hz 15W 483W x 45H x244 D 19 x 1 75 x 9 6 2 9kg CARE AND MAINTENANCE Your Pyramid Stereo 15 Band Graphic Equalizer is an example of superior design and craftsmanship The following suggestions will help you care for your Graphic Equalizer so you can enjoy it for years PN Keep the graphic equalizer vy NIIN dry If it does get wet wipe it dry immediately Liquids contain minerals that can corrode electronic circuits Use and store the graphic equalizer only in normal temperature environments Temperature extremes can shorten the life of elec tronic devices and distort or melt plastic parts Handle the graphic equal i
6. ince it is possible that certain settings of the Frequency Equalization Slide Controls will increase or decrease the total average signal level the LEVEL CONTROLS are used to adjust each channel so that the average output will be equal to the input signal level This adjusts the Equalizer for Unity Gain 7 LINE OUTPUT JACKS These outputs typically plug into yout amplifier s input jacks 8 LINE INPUT JACKS 9 110V 60Hz 220V 50Hz SELECTOR In this way the equalizer is used to flatten the often uneven frequency response of stereo components and compensate for peculiarities in room acoustics and also to reduce noise in program source By moving the appropriate controls up or down a few dB you can alter the total qual ity to suit your personal preference THE MUSICAL SPECTRUM This chart correlates familiar musical instruments with the numerical frequen cies that they produce Given the often talked about musical range of 20 to 20 000 Hz it is surprising to see how low musical fundamentals actually are Almost all are under 3 500 Hz It Should be understood however that if all instruments were perceived only by their fundamental frequency output white areas they would all sound alike It is the harmonics or overtones Shaded areas that give each individ ual instrument its character or timbre and set it apart from the rest Interestingly enough the human ear is more sensitive to certain octaves in the musical spec
7. trum than to others j Approximate fundamental range and lower harmonics been 3 77 Approximate mate ee of relati vey important harmonics subjective by necessi ty TE aire sal seden oiia diasin pi FRENCH HORN nn I J L L t i Cid TRUMPET SS eS DT Sey 7 a CYBAL I ICTL p peed pial oain oo ae MALE voice FEMALE vore FEMALE VOICE 20 30 40 60 L420 240 S00 Coool 2000 HZ LJ FREQUENCY LEVEL CONTROLS Whoever designed this engineering marvel deemed it necessary to tune the ear more toward the midrange frequencies where speech and voice communication occur than to the outer octaves of low bass and high musical overtones As a result very small energy changes here will cause a more drastic psychoacoustic effect that larger changes would at the frequency extremes In order to discuss the qualitative effects of adjustment in tonal balance it is best to arbitrarily divide the musical spectrum into five ranges The Bass approximately 20 140 Hz There is little musical material with fundamen tal frequencies below about 60 Hz and what is normally perceived as low bass material is actually in the 60 140 Hz range The very lowest frequency control can be used to enhance output for the few instruments in that range organ contrabas soon etc or it can be used to reduce rumble acoustic feedback and other low frequency aberrations The 30 Hz 60 Hz and
8. zer gently and carefully Dropping it can damage the circuit boards and can cause it to work improp erly Keep the graphic equal izer away from dust and dirt which can Cause premature wear of parts Wipe the graphic equal izer with a damp cloth occasionally to keep it looking new Do not use harsh chemicals clean ing solvents or strong detergents to clean the graphic equalizer www pyramidcaraudio com 8
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