4 channels, full-range amplifier with electronic filter and variable Bass EQ on the back channels

Sold from 2013 until 2014

Getting started with your GX-A604

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Product Specifications

Number of Channels
4 channels
Number Of Channels
4 Channels
Amplifier Power (RMS)
4 ohm... 60W x 4, <1% THD+N
Power Handling (peak)
Signal-to-Noise Ratio
Frequency Response
20Hz – 20kHz
Total Harmonic Distortion
Input Sensitivity
Variable Bass Boost
0 to + 12dB @ 45Hz
$179.95 each
Signal-to-Noise Ratio
Total Peak Power Output
;less than 1%
Frequency Response
Input Sensitivity
Bridged Power Output
170W x 2 into 4 ohms
4-Ohm Power Output
60 Watts RMS x 4 channels
Variable Bass Boost
0 to + 12dB @45Hz
2-Ohm Power Output
85 Watts RMS x 4 channels
Width (in)
Depth (mm)
Height (mm)
Depth (in)
Width (mm)
Height (in)
Dimensions (H x W x D)
2-1/16 inch x 8-1/8 inch x 11-13/16 inch (52mm x 206mm x 300mm)

Powerful and Compact 435-Watt Amplifier

A 435-watt, four-channel, full-range powerhouse, the GX-A604 – with on-board variable electronic crossovers and variable Bass EQ on the rear channels – is certainly a versatile system building tool. With all that power inside a 2-1/16" (52mm) high, 8-1/8" (206mm) wide and 11 13/16" (300mm) deep package, the GX-A604 is easy to install yet can serve as the foundation of a truly sophisticated sound system. Features include a cast-aluminum heat sink, built-in electronic crossover networks and bass boos circuits. With almost seven decades of experience in bringing live music to life, JBL® has adapted many of our professional technologies for use in our car audio systems, transforming your road-going listening experience with new levels of power and clarity. Whether you’re looking at dramatically improving the sound of your factory installed audio system or designing a world-class competitive sound system from the chassis up, your JBL car audio retailer has everything you’re looking for. Crank up both the volume and the fidelity of your factory-installed sound system with the new GX Series amplifiers. Ranging from a compact stereo amplifier with enough power to drive the most demanding speaker systems, to the thunderous GX-A3001 with well over 400 watts of raw bass power to shake the ground, GX amplifiers cover the range at surprisingly affordable prices. There’s nothing wrong with your existing audio system that real power can’t fix, and GX series amps make adding that power easy. Setting up a sound system to fill your car takes not only great gear, but the ability to make all the components work together as an integrated whole. On board active crossovers and separate line- and speaker-level inputs make it easy to tie the new GX amps to the rest of your system, and carefully engineered Bass Boost circuits make it easy to get the sound you crave, whether you’re upgrading a factory system or building from scratch. For years, JBL’s engineers have made the gear that experts have relied on. Now, we also make gear that helps you perform like an expert.

The GX-A604 is equipped with both low-level and high-level inputs, allowing conncetion to virtually any factory or aftermarket head unit. Low-level input is made via standard RCA connectors and high-level inputs made via a supplied Molex connector and harness.
The 12dB per octave electronic crossover is fixed at 80Hz and can be selected either high-pass or low-pass. This allows the GX-A602 can be used as a an amplifeir to drive full-range speakers or as a subwoofer amplifier.
The GX-A602 also has an switchable bass boost circuit on the rear channels that adds a fixed at 45Hz and will provide+12dB of gain.

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