PS-7KX - Amplifier Pyramid - Free user manual and instructions

Product Type	Car Audio Amplifier
Model	PS-7KX
Brand	Pyramid
Channels	2-Channel
RMS Power (4 ohm)	100W x 2
RMS Power (2 ohm)	200W x 2
Bridged Power (4 ohm)	400W x 1
Frequency Response	20 Hz – 20 kHz
Dimensions (W x H x D)	10.2 x 2.1 x 6.3 in
Weight	3.2 lbs
Power Supply Voltage	12V DC (Negative Ground)
Fuse Rating	30A (x2)
Input Sensitivity	200 mV – 6V
Low Pass Filter	40 Hz – 400 Hz, 12 dB/octave
High Pass Filter	15 Hz – 400 Hz, 12 dB/octave
Bass Boost	0 – 18 dB at 45 Hz
Maintenance	Clean with dry, soft cloth; avoid moisture
Safety	Disconnect battery before installation; use correct gauge wiring
Spare Parts / Repairability	Not user-serviceable; contact retailer for service
General Information	Designed for car audio systems; 1-year warranty

Frequently Asked Questions - PS-7KX Pyramid

How do I wire the PS-7KX amplifier to my car battery?

Connect the power terminal to a 12V battery source using a 4 AWG power cable with an inline fuse (rated 60A) within 18 inches of the battery. Ground the amplifier to a clean chassis point using the same gauge wire.

What speaker impedance can I use?

The amplifier is stable down to 2 ohms per channel in stereo mode and 4 ohms bridged. Avoid lower impedances to prevent overheating.

How do I bridge the amplifier?

Use the left positive (+) and right negative (-) speaker terminals. Ensure the load is 4 ohms minimum. The amplifier will deliver 400W RMS.

Why is my amplifier going into protection mode?

Possible causes: short circuit in speaker wires, overheating, or low battery voltage. Check connections, ensure proper ventilation, and verify battery voltage is above 11V.

What are the recommended gain settings?

Start with gain at minimum. Play music at 3/4 volume, then gradually increase gain until you hear distortion, then back off slightly. This ensures clean output.

Does this amplifier have a remote turn-on lead?

Yes, use the REM terminal connected to the head unit's remote output (blue wire). This turns the amplifier on/off with the stereo.

Can I use the amplifier with a factory stereo?

Yes, but you may need a line output converter (LOC) if the factory head unit lacks RCA outputs. The amplifier accepts high-level inputs via speaker wire connections.

What is the maximum current draw?

At full power, the amplifier can draw up to 60A. Ensure your vehicle's electrical system and alternator can support the load.

How do I clean and maintain the amplifier?

Use a dry, soft cloth to remove dust. Avoid water or solvents. Clean the cooling fins regularly to prevent overheating.

My amplifier has no sound. What should I check?

First, verify power (12V) and ground connections. Check remote turn-on wire for 12V. Ensure speakers are connected properly and not shorted. Test with known working source.

USER MANUAL PS-7KX Pyramid

PYRAMID® Gold Series

REGULATED DC POWER SUPPLY

MODEL: PS-3KX/4KX/7KX/8KX

INSTRUCTION MANUAL

GENERAL SPECIFICATION ……PAGE 2.

SCHEMATIC DIAGRAM ……PAGE 3.

•NOTE: INPUT AT 115VAC AND OUTPUT AT CONT. CURRENT

MECHANICAL:

(B-1) DIMENSIONS: 190mm x 125mm x 76mm. (L x W x H)
(B-2) WEIGHT KGS	1.7KGS	1.8KGS	2.1KGS	2.5KGS
(B-3) ENCLOSURE BLACK	YES	YES	YES	YES
(B-4) INPUT CABLE: 18AWG x 2C W/1-15P PLUG,	SPT-2 6FT	SPT-2 6FT	SPT-2 6FT	SPT-2 6FT
(B-5) OUTPUT TERMINAL: BINDING POST, 10A/125V	YES	YES	YES	YES
(B-6) POWER SWITCH: ILLUMINATED, 15A/125VAC.	YES	YES	YES	YES

CIRCUIT DIAGRAM PS-3KX/4KX/7KX/8KX

CIRCUIT ARE SUBJECT TO CHANGE WITHOUT NOTICE

OPERATION:

1 INSERT AC POWER PLUG INTO A 110V VOLT AC OUTLET.
2. CONNECT THE POWER CORD OF YOUR EQUIPMENT (13.5V — 14 1VDC) TO THE OUTPUT BINDING POST TERMINALS ON THE FRONT OF THE UNIT .BE SURE THAT POLARITY IS CORRECT. THE RED POSITIVE (.+) TERMINAL AND BLACK NEGATIVE (-) TERMINAL ARE MARKED, REVERSAL OF POLARITY.MAY DAMAGE YOUR EQUIPMENT.
3 TURN SWITCH TO "ON", RED LIGHT IN SWITCH WILL ILLUMINATE
4 THE INPUT POWER IS PROTECTED BY THE FUSE WHICH IS LOCATED AT THE REAR OF THE UNIT AND CAN BE REPLACED BY UNSCREWING THE FUSE HOLDER IF THE FUSE IS BURNT OUT. DO NOT USE A FUSE LARGER THAN .. AMPS. USE OF HEAVIER FUSE MAY RESULT IN DAMAGING TO THIS UNIT .(.. SEE NOTE)
5. THIS UNIT HAS ELECTRONIC OVERLOAD PROTECTION WITH INSTANT AUTOMATIC RESET FUNCTION. IF OUTPUT IS OVERLOADED. THE OUTPUT POWER WILL AUTOMATICALLY SHUT OFF. RELEASE POWER CORD OF YOUR EQUIPMENT FROM THE OUTPUT TERMINALS AND CHECK THE ACTUAL POWER RATING OF YOUR EQUIPMENT. THIS UNIT WILL AUTOMATICALLY RESET INSTANTLY
6. OVER TEMPERATURE PROTECTION CIRCUITRY IS USED IN PS-7KX/8KX TO PREVENT OVER HEAT DAMAGE. UNIT WILL BE SHUT DOWN MINUTES AFTER 15 MINUTES(MIN.) AT 100% RATED LOAD. 25 MINUTES(MIN.) AT 80% RATED LOAD.

.. NOTE PS-3KX : 1.5 AMP
PS-4KX : 1.0 AMP
PS-7KX : 1.5 AMP
PS-8KX : 1.5 AMP

CAUTIONS:

1. DO NOT USE WITH EQUIPMENT REQUIRING MORE THAN RATING AMPS.
2. DO NOT USE OUTDOORS. DO NOT EXPOSE UNIT TO RAIN, MOISTURE, WATER OR ANY OTHER LIQUIDS
3. DO NOT REMOVE COVER IN ANY CASE. RETURN TO DEALER FOR REPAIR IF DAMAGED.
4. THIS UNIT HAS A SPECIAL BUILT-IN FEATURE THAT WILL SHUT THE UNIT DOWN IF MARKED AMPERAGE IS EXCEEDED. THIS WILL AVOID BURN-OUT OF YOUR EQUIPMENT AND OF UNIT. IF UNIT DOES CONSISTENTLY SHUTDOWN. THIS MEANS YOU ARE DRAWING TOO MUCH AMPERAGE. RETURN UNIT TO PLACE OF PURCHASE AND UPGRADE TO NEXT AVAILABLE UNIT OFFERING HIGHER AMPERAGE. PLEASE DO NOT BYPASS OR ALTER THIS CIRCUIT AS IT IS THERE TO PROTECT YOU. ANY ALTERATION OR MISUSE WILL VOID YOUR WARRANTY.

"DANGER"

HIGH VOLTAGE

REFER TO QUALIFIED TECHNICIAN FOR SERVICE.