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

kr 1.499,001499.0 each
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Number of Channels/Type 2 Channels 4 Channels Mono / Subwoofer
4-Ohm Power Output 60W rms x 2* 60W rms x 4* 200W rms x 1*
2-Ohm Power Output 85W rms x 2* 85W rms x 4* 300W rms x 1*
Bridged Power Output 170W x 1 into 4 ohms* 170W x 2 into 4 ohms* 170W x 2 into 4 ohms*
Total Peak Power Output 280W 435W 415W
Signal-to-Noise Ratio 93dB
(ref rated output @ 4ohms)
(ref rated output @ 4ohms)
(ref rated output @ 4ohms)
Frequency Response 20Hz - 20kHz ±1dB 20Hz - 20kHz ±1dB 10Hz - 320Hz
Input Sensitivity 200mV-20V 200mV-20V 100mV-20V
Variable Electronic Crossover Yes Yes Yes
Variable Bass Boost Yes Yes Yes
Input Connections High & low-level (RCA) High & low-level (RCA) High & low-level (RCA)
Input Connections High & low-level (RCA) High & low-level (RCA) High & low-level (RCA)
Signal Output Connections No L & R line level (summed) No
Dimensions (L x W x H) 2-1/16" x 7-13/16" x 8-1/8"
(52mm x 198mm x 206mm)
2-1/16" x 11-13/16" x 8-1/8"
(52mm x 300mm x 206mm)
2-1/16" x 11-7/16" x 8-1/8"
(52mm x 291mm x 206mm)
* <1.0% THD + N
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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
Click here for a complete list of all specs for this product

Spec Sheet (EN)

99 KB
  • 1 x GX-A604
  • User Manual

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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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I want to take my rear channel speaker high level output and tie into the GZa604 amp and get 4 channel output. Will this work, do I have to tie into both high level inputs or just 1 input? Does this amp come with 1 or 2 high level input cables?

Asked by: Steven D
We would like to work with you&nbsp;directly&nbsp;to help you with your issue. Please submit a case request at&nbsp;https://www.jbl.com/support-contact.html&nbsp;and the Customer Service Team will be more than happy to assist you.
Answered by: Mario at Customer service
Date published: 2018-05-09

Can i use this to power my 4 jbl gx602&rsquo;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 I use the GX-A604 to power a JBL CS1204B subwoofer and 2 13cm speakers with a max 250W power output and 35W RMS, without loosing any sound quality? or should I just power the sub only? Thanks

Asked by: bon1999
The GX-A604 is can power the sub but it would be too much for the speakers since they can only handle 35 RMS while the GX-A604 only handles 60W at 4 ohms and 85W at 2 ohms. If you're planning on connecting the speakers I would advise not to crank it up too much as it may damage the speakers in the long run.
Answered by: Mario at Customer service
Date published: 2018-05-09

Can I use this GX-A604 (setting 2 Ohtm to get 85W RMS x4 channel) to powered your speaker JBL GX-600C (2.3 Ohm impedance, 70W RMS) without loosing any single drop of sound quality?

Asked by: deathsatans
Absolutely yes, it would work great. Small difference of wattage between the amp and speaker will not affect nor compromise the sound quality.
Answered by: Drin at Customer Service
Date published: 2017-12-02

Will this amp run well with the club 6500C package, a pair of GT7-6's and a S2-1024 sub, or do I need a 5 channel amp?

Asked by: Ryan11
Unfortunately you need a 5 channel amplifier in order to use all of those speakers, the GX-A604 can power up to 4 speakers only. Kindly check the Club 4505 specification below, it can support all 5 speakers. Club-4505 Specfication: High-performance 5-channel car amplifier Compact design to fit in more vehicles High- and low-level inputs to work with virtually any stereo Variable crossovers and bass boost Compatibility with advanced vehicle technology Max Power: 1800W Peak Full Range Channels Power Output, 2&Omega;: 65Wrms x 4, &lt;1.0% THD+N Power Output, 4&Omega;: 45Wrms x 4, &lt;1.0% THD+N Power Output, 4&Omega; Bridged: 130Wrms x 2, &lt;1.0% THD+N Signal-to-Noise Ratio: &ge;85dB (ref 1W output @ 4&Omega;) Subwoofer Channel Power Output, 2&Omega;: 500Wrms x 1, &lt;1.0% THD+N Power Output, 4&Omega;: 320Wrms x 1, &lt;1.0% THD+N Signal-to-Noise Ratio: &ge;80dB (ref 1W output @ 2&Omega;)
Answered by: Joe G at Customer Service
Date published: 2017-12-02

WOULD THIS BE THE RIGHT AMP FOR ME I HAVE 2 JBL - 6-1/2&quot; Model: GX600C AND 2 JBL - 6&quot; x 9&quot; 3-Way Model: GX963 could this push them all

Asked by: 760alberto
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 GX600C can handle up to 100W and 60W continuous average, respectively.
Answered by: Memen at Customer Service
Date published: 2017-12-02

Hello, I'll be using GTO 629 and GTO 609C on my car, will this amplifier be enough to run those speakers or you may recommend other amplifier?

Asked by: eric_gee
The GX-A604 amp has a output of 60w per channel at 4 ohms.The GTO 629 can handle 60w at 3 ohms and the GTO 609c is 90w at 3 ohms. At this rate, the GX-A604 amp will match the speakers' impedance, which will increase the power output a bit. GTR 104 which is rated 100W per channel at 4 ohms will also work for your speakers but will provide more power. End of the day, it will come down on how loud you want your speakers to play, because more power will distribute higher volume.
Answered by: Miko at Customer Service
Date published: 2017-12-02

I have a GX-A604 amp and my plan is to use 2 channels to drive a set of GTO939's in the rear deck and the other 2 channels to drive a set of GTO629's and GTO19T's in the front. Will I have an impendence problem with the front speakers wired in parallel?

Asked by: Kevin E
The GTO629 are 3 ohm speakers, if you'll wire them in parallel to the GTO19T, it will cut the impedance in half (around 1.5 ohms). Also this would double the power output of the A604 amp from 85 to 170 watts, which it can't handle. Wiring in parallel will push out too much power to the speakers and drop the impedance really low, this is not recommended.
Answered by: Aj at Customer Service
Date published: 2017-12-02
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