Pyramid 901GC Instruction Manual Download Page 2

This model is intended for those who value the acoustic benefits of a
multi - band Graphic Equalizer but who also desire higher audio power level
capabilities than can be obtained in an in-dash unit. Being a passive Equalizer, it 
contain power amplifiers to drive speakers directly, Also provides one stereo
signal line output and 1 pair sub-woofer output can be connected to remote high-
power amplifiers. The ten center-frequencies are connected in the critical
50Hz to 12Hz region where compensation is most needed.

LOCATION AND FUNCTION OF CONTROL

     PRECAUTIONS

1.  Most speaker systems require rather heavy boost at the lowest 

4. Due to limitations in human hearings. Sound above 8KHz is not heard 
    very well. Moderate boost at 1KHz adds a crisp character when 
    percussion instruments are present.

3. The mid-range from 3 to 6KHz should not require much change from 
    flat [center] most speakers work well here. Adjust per your taste.

2. Due to sound-wave reflections between the front and rear windshields of 
    a typical vehicle, there may be heavy loss between 700Hz to 1.3KHz so 
    moderate boost here is very effective and will create more presence for 
    vocalists.

     frequencies due to the large amount of air that must be moved. Speaker
     woofer cones responder between 45-60Hz where output is higher so do
     not boost much at 60Hz. Use heavy boost at 100Hz, less boost at 
     400Hz. 

1. FADER KNOB
    Allow front to rear balancing in four speaker systems for best directional
    imaging.

2. EQ KNOBS

3. LED INDICATOR

4. POWER BUTTON
    Press it to turn on or off the unit.

    Each slide controls the amount of boost or cut in one small part of the total
    audio frequency range. With all slides in the center position, the overall 
    frequency response is flat. By moving any slide up or down. The output 
    within the band is increased or decreased by up to 12db.

WIRING CONNECTION

B+

B -

GREEN

GREEN/WHITE

BLUE

BLUE/WHITE

BROWN/WHITE

BROWN

R. R

F. R

F. L

R. L

RED

BLACK

L+IN YELLOW

GREY

L

R

2  SPEAKER  SYSTEM

4  SPEAKER  SYSTEM

BROWN

BLUE

BROWN/WHITE

BLUE/WHITE

R+IN PURPLE

GREY/WHITE

R-IN PURPLE/WHITE

GREEN/WHITE

L-IN YELLOW/WHITE

GREEN

GREY

GREY/WHITE

7A FUSE

CAR RADIO

SPEAKER OUTPUT

L +

L -

R -

R +

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