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Service Manual

power amplifier 

-  CONTENTS  -   

SPECIFICATIONS ………………………………………..2 

CONNECTIONS……………………………………………3

BASIC TROUBLESHOOTING… ………………..……....8 

PACKAGING EXPLODED VIEW ……………................9

EXPLODED VIEW …..………....…….….….…………....10

ELECTRICAL PARTS LIST……………………………...11 

PCB DRAWINGS…………….……….……….…….……22 

BLOCK DIAGRAM…………………………....….....……25 

SCHEMATIC………..….…….……………….…...….…..26

Number of Channels:

4

Power Output (CEA 2006A):

80W RMS x 4 channels at 4 ohms, 14.4V DC, <1.0% THD

100W RMS x 4 channels at 2 ohms, 14.4V DC, <1.0% THD

200W RMS x 2 channels bridged at 4 ohms, 14.4V DC, <1.0% THD

Max Power:

940W: 235W x 4 channels at 2 ohms (1kHz), 15.5V DC, 10% THD

Frequency Response:

20Hz – 23kHz (±0.5dB)

Crosstalk:

> 50dB @ 1kHz

Signal-to-Noise (@ 1W):

> 85dB

Maximum Current Draw:

60A

Fuse Replacement:

25A x 2

Dimensions (D x H x W):

11-15/16" x 2-9/16" x 9-11/16" (302mm x 66mm x 246mm)

Weight:

8.4 lb (3.8kg)

2

The GTO series amplifiers are capable of delivering extremely high power levels, and require a heavy-duty and 
reliable connection to the vehicle’s electrical system to achieve optimal performance. Please adhere to the following 
instructions carefully.

GTO series amplifiers use the same type of screw terminals for power and speaker connections. This type of terminal 
is easy to use, provides superior current transfer and allows the easy connection of large-gauge wire.

To use the connectors, use a Phillips screwdriver to loosen the connector’s set screw, insert the bare wire and tighten 
the set screw to secure the wire in the connector.

Connect a wire (minimum 8AWG – 8.4mm

2

 – for the GTO-804EZ; minimum 10AWG – 5.3mm

2

 – for the GTO-504EZ) 

from the amplifier’s GND terminal directly to a solid point on the vehicle’s chassis. For a good connection, use 
sandpaper to clear the paint from the metal surface at this chassis location. Use a star-type lock washer to secure the 
wire’s connection.

3

1.  Connect a wire (minimum 8AWG – 8.4mm

2

 – for the GTO-804EZ; minimum 10AWG – 5.3mm

2

 – for the 

GTO-504EZ) directly to the battery’s positive (+) terminal. 

2.  Install a fuse holder for a 50A fuse (GTO-804EZ) or 40A fuse (GTO-504EZ) on this wire within 18" (46cm) of the 

battery’s (+) terminal. Do not install the fuse in the holder at this time.

3.  Route this wire to the amplifier’s location and connect it to the amplifier’s +12V terminal. Be sure to use 

appropriate grommets whenever routing wires through the firewall or other sheet metal. IMPORTANT: Failure to 
adequately protect the positive wire from potential damage may result in a vehicle fire.

4.  When you are finished routing and connecting this wire, install the appropriate fuse in the holder you installed near 

the battery. (GTO-804EZ – 50A fuse; GTO-504EZ – 40A fuse.)

Always connect the (+) terminal on the amplifier to the (+) terminal on the speaker and the (–) terminal on the amplifier 
to the (–) terminal on the speaker.

IMPORTANT: Make sure the (+) and (–) bare wires do not touch each other or the other terminal at both the amplifier 
terminals and speaker terminals. Touching wires can cause a short circuit that can damage the amplifier.

NOTE: The minimum speaker impedance for stereo operation is 2 ohms. The minimum speaker impedance for bridged 
operation is 4 ohms.

• Connect the front speakers to the FL and FR (+) and (–) terminals. 

• Connect the rear speakers to the RL and RR (+) and (–) terminals. 

4