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Service Manual

subwoofer amplifier

-  CONTENTS  -   

SPECIFICATIONS ………………………………………..2 

CONNECTIONS……………………………………………3

BASIC TROUBLESHOOTING… ………………..……....6 

PACKAGING EXPLODED VIEW ……………................7

EXPLODED VIEW …..………....…….….….………….....8

ELECTRICAL PARTS LIST……………………………....9 

PCB DRAWINGS…………….……….……….…….……20 

BLOCK DIAGRAM…………………………....….....……23 

SCHEMATIC………..….…….……………….…...….…..24

Number of Channels:

1

Power Output (CEA 2006A):

650W RMS x 1 channel at 4 ohms, 14.4V DC, <1.0% THD 
1000W RMS x 1 channel at 2 ohms, 14.4V DC, <1.0% THD

Max Power:

1450W x 1 channel at 2 ohms (50Hz), 15.5V DC, 10% THD

Frequency Response:

10Hz – 280Hz (±3dB)

Signal-to-Noise (@ 1W):

> 80dB

Maximum Current Draw:

95A

Fuse Replacement:

40A x 3

Dimensions (D x H x W):

14-11/16" x 2-9/16" x 9-11/16" (373mm x 66mm x 246mm)

Weight:

10.8 lb (4.9kg)

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The GTO subwoofer 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 subwoofer 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 6AWG – 13.2mm

2

 – for the GTO-1001EZ; minimum 8AWG – 8.4mm

2

 – for the GTO-751EZ 

and GTO 501EZ) 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.

-

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1.  Connect a wire (minimum 6AWG – 13.2mm

2

 – for the GTO-1001EZ; minimum 8AWG – 8.4mm

2

 –for the 

GTO-751EZ and GTO-501EZ) directly to the battery’s positive (+) terminal. 

2.  Install a fuse holder for a 120A fuse (GTO-1001EZ), 80A fuse (GTO-751EZ) or 50A Fuse (GTO-501EZ) 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-1001EZ = 120A fuse; GTO-751EZ = 80A fuse; GTO-501EZ = 50A fuse.)

Connect the subwoofer to the amplifier’s Sub (+) and (–) terminals. 

-

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

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

NOTE: The minimum subwoofer impedance is 2 ohms.

IMPORTANT: Disconnect the vehicle’s negative (–) battery terminal before beginning the installation.

If you have not already done so, remove the two end caps that cover the amplifier’s connectors as explained in 
Mounting the Amplifier, above. This will provide easier access to all of the amplifier’s connectors.

No remote turn-on connection is necessary because GTO amplifiers include signal-sensing turn-on, which will turn 
the amplifier on when it receives an audio signal at any of its input connectors. The amplifier will automatically turn off 
approximately five minutes after the input signal ceases. 

If your audio system’s source unit includes a remote turn-on wire and you would prefer to use it, the amplifier 
will sense that you’ve used a remote turn-on wire and that connection will override the signal-sensing turn-on. If 
necessary, you can defeat the signal-sensing turn-on circuit by moving the Auto Turn-On switch to the “Off” position.

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