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

$149.95149.95 each

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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.

Item# GX-A604

General Specifications

Number of Channels 4 channels

Audio Specifications

Signal-to-Noise Ratio 93dB
Total Peak Power Output 435W
THD + N <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 (EN)

English 99 KB
  • 1 GX-A604 Amplifier
  • 1 Owner's Manual

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1 Year

Note: the Warranty Card provided with your JBL product contains the full terms and conditions of your warranty.

Unless a different warranty period is stated in the Warranty Card provided with your JBL product, JBL warrants for a period of 1 year (5 years for any non-powered speakers) from the date of retail purchase by the original end-use purchaser, that this product, when delivered to you in new condition, in original packaging, from a JBL authorized reseller and used in normal conditions, is free from any defects in manufacturing, materials and workmanship. Refer to the Warranty Card provided with your JBL product for specific details including what is not covered along with other terms and conditions.

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GX-A604 is rated 5.0 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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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: 2017-12-02

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: 2017-12-21

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

I'm using the GX-604 4 channel amp with 4 JBL 6.5&quot; 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.&nbsp; The link is located at the top of this page.&nbsp; To submit a support case, please fill out the Contact Us form at the same location.
Answered by: Danny HARMAN
Date published: 2018-01-12
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JBL GX-A604 435W 4-Channel GX Series Amplifier
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