Pyramid Studio PRO PEQ-60 User manual

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 musical sound, louder,
the PEQ-60 can give you perfect satisfaction.

OPERATING:
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1.POWER SWITCH & 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.
since 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 spectrum 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)
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[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 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.
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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 have 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 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.
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+
+
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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%
>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-
izer 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
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