Item# GX-A604_
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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
  • 1 x GX-A604
  • User Manual
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.

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GX-A604 is rated 4.7 out of 5 by 3.
Rated 5 out of 5 by from Van Instalation and it is wicked I have just had this installed in my Companies delivery van and it is awesome, it is firing a pair of 3 ways as Mid and Tweeter which I will change for a pair of JBL's now and an 8inch passive sub and it sounds great, got to get a monorail for the sub and use the GX-A604 for my high range in the dash, I am a JBL Lover any ways, I use the 2 control 10's in my home cinema set up. I highly recommend this amp to anyone.
Date published: 2018-02-11
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
Rated 4 out of 5 by from Great Amplifier but... I bought this amp and it has a lot of settings. But if you are connecting 2 middle speakers with 1 subwoofer ( or as my case only 1 subwoofer ) you definitely need power capacitator to power up the amp, otherwise, it will drop off when you pump the volume up. It's heating up so it's better to mount it in open space not in closed box or confined space
Date published: 2018-03-02
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hello can I install this amp with two JBL GTO 939? thank you!

Asked by: RogerioSwiss
The amp gives 85 watts at 2 ohms while the GTO 939 requires 100W of power at 3 ohms which is a little short of power, you can still connect it to each other but they won't bring each other to their full potential.
Answered by: Mario at Customer Service
Date published: 2018-08-27

Sir , my question is i have to install amplifire and subwoofer in volkswagen polo highline plus Amplifire - GXA604H peak power 1200w Subwoofer - gtx 1300T What gauge of wire i'll use?

Asked by: Gyan
Hi! Normally, if you are connecting the subwoofer to the amp, you could use an 8-12" gauge wire.
Answered by: Nick F
Date published: 2018-05-31

What gauge of wire i'll use for gx a 604 1200 peak power

Asked by: Gyan
You will need 14-16 gauge wires for these amplifiers.
Answered by: Dan E
Date published: 2018-05-30

Can i use this to power my 4 jbl gx602’s?

Asked by: Ibrahin99
Yes the GXA604 amplifier will work with the GX 602 speakers without any issues.
Answered by: Nick F
Date published: 2018-04-04

Can the GX-A604 power my GTO 609c component speakers and GT5-12 subwoofer?

Asked by: airjao23
Yes, that would be no problem at all.
Answered by: Mario at Customer Service
Date published: 2018-01-28

Hello. Does this amp work in 3 channels? having 2 straight for components and the other 2 bridged for a subwoofer? Thanks :)

Asked by: Max_Power
We would like to work with you directly to help you with your issue. Please submit a case request at https://www.jbl.com/support-contact.html and the Customer Service Team will be more than happy to assist you.
Answered by: Steven M
Date published: 2018-01-11

I'm using the GX-604 4 channel amp with 4 JBL 6.5" CS762 coaxial speakers. What should I have be level set to? 0.2v or 4.0v? Thanks

Asked by: Ainsley
Hi Ainsley, Thank you for the question. You might find the answer to your question in our Product Support FAQ and Knowledgebase Sections.  The link is located at the top of this page.  To submit a support case, please fill out the Contact Us form at the same location.
Answered by: Danny HARMAN
Date published: 2018-02-09

Good day all, I'm planning to buy a GX 602 for the rear speakers, while GX 402 for front speakers of my compact car. Is this GX A604 suitable for this setup?

Asked by: Jarn
Hi the GX 602 and the GX 402 can handle 60W and 35W respectively while the GX A604 drives 60W at 4 ohms which would be too much for the GX 402 than it can handle.  I would suggest to choose a different speaker for the front that can handle 60W.  If you need further assistance in looking for a speaker,Please submit a case request at https://www.harmanaudio.com/support-contact.html and the Customer Service Team will be more than happy to assist you.
Answered by: Mario at Customer Service
Date published: 2017-12-13
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