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

£104.99104.99 each £139.99
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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.

Item# GX-A604

General Specifications

Number of Channels 4 channels

Audio Specifications

Signal-to-Noise Ratio 93dB
Total Peak Power Output 435W
THD + N ;less than 1%
Frequency Response 20Hz-20kHz
Input Sensitivity 20mV-20V
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) 8-1/8
Depth (mm) 300
Height (mm) 52
Depth (in) 11-13/16
Width (mm) 206
Height (in) 2-1/16
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Spec Sheet

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  • User Manual

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GX-A604 is rated NaN out of 5 by 1.
Rated 5 out of 5 by from Great inexpensive amp! I'm using this amp driven by a JBL MS-8. The amp is a good step up from your typical 20W/channel systems. Very noticeable gain difference in that it plays loud and clean w/little distortion. Using 2 of 4 channels bridged for a passive sub and that works well too. Recommended.
Date published: 2016-11-17
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Is this a good fit with, JBL - 6" x 9" 3-Way Car Speakers with Polypropylene Cones and JBL - 6-1/2" 2-Way Coaxial Car Speakers with Polypropylene Cones; Speakers?

Asked by: Kurt Y
Yes, the GX-A604 four-channel amplifier would work beautifully with the GX963 and GX602 speakers. This amplifier can drive up to 85W of power to a 2-ohm load speaker. The GX963 and GX602 can handle up to 100W and 60W continuous average, respectively.
Answered by: Ren at Customer Service
Date published: 2017-03-19

Hallo. Is the subwoofer "Hertz es 250d.5" suitable for this Amplifier? "JBL gx-A604 It is a dual coil subwoofer. I'll connect it to channels 3 and 4. Can I?

Asked by: LorenzoRicheri
Hi Lorenzo, I would like to suggest that you print the specifications sheet from our website for the amplifier, and visit a car audio specialist. We sadly cannot help with installations if not all components used are produced by us. If you wish to find out how we can help you with a complete set of JBL car audio products, please contact our Customer Service department, and we will assist you there
Answered by: Kay Harman
Date published: 2017-02-06

GX-A604 JBL CAR AMPLIFIER Is Sutailble For JBL-1000 watts Sub-Woofer & Get Gud Bass

Asked by: RoN RoY
Hi Thank you for your question. GX-A604 is Suitable for a JBL-1000 watts Sub-Woofer if it is connected in Bridged mode. I would also advise you to consider Club-4505 or Club-5501, Which has more effect and would be more suitable for this Sub-woofer. If you have further questions, please contact our customer help-desk.
Answered by: Mogens
Date published: 2017-01-26

Hello, Could you please tell me if these products will fit together: JBL S2-1224SS Subwoofer, And this amplifier? And what type of wire do I need to use to connect subwoofer to this amplifier?

Asked by: Kristaps
Hi Thank you for the question. The JBL S2-1224SS subwoofer and GX-604 amplifier will work great together. The woofer connection wire you should use, should be minimum AWG14 - Which is 2.08 mm2 If you have further questions then, please contact customer help-desk.
Answered by: Mogens
Date published: 2016-11-05

I have JBL GX A646SI Four Channel Car Amplifier with JBL GT5-10D 10-Inch Dual-Voice-Coil Subwoofer can i convert to as a home theater in my home

Asked by: pavan kumar
A car-amplifier is not suitable for an home theater system - it doesn't decode DTS or Dolby signals which one would expect from a home theater system
Answered by: Mogens
Date published: 2016-10-03

Hallo. Can i use this amplifier with the subwoofer "JBL GT5-12" and the speakers "GX600c"? Thanks a lot.

Asked by: LorenzoRicheri

Hi, I'd like to gett a better sound on my 4Runner 2017, I'm planning to buy a GTO939 and a GTO629 which both says fit in the car but i just don't know what else should I buy to make them work well, can you give me an advice?

Asked by: Loren
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