GTO-1001EZ - JBL Car Audio Service Manual (repair manual). Page 3

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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