Item# GTX500

GTX 500


750 watt, Mono Subwoofer Amplifier

$199.95199.95 each
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Does It Fit My Car?

The JBL GTX500 is the ideal upgrade for those car audio enthusiasts who want exceptional bass without breaking the bank. And don’t let its size fool you. While the GTX500 may be compact, with a max power output of 750 watts you can drive your subs as you see fit. While its true JBL sound sets it apart from other subwoofer amps, it’s ease-of-use and installation, configuration and calibration makes it truly stand out—it connects to OEM or aftermarket systems without complicated adapters or setup routines.

What's in the box?

  • GTX500 Amplifier
  • 2 bare wire-to-RCA adapters

Cars are small, and the space inside them is a challenge to audio engineers. But the GTX500 gives you big, commanding sound. You’ll have 350 watts of RMS at an impedance of 4 ohms, 500 watts at 2 ohms and 770 watts at peak power.

The GTX500’s variable crossover allows you to optimize tuning based on your speaker location and specific components. And you can do it whether you’re a rocket scientist or not.

With a frequency response of 10Hz to 280Hz, the GTX500 reproduces deep bass tones cleanly. Its full-range preamp outputs allow for multiple hookups without high-loss Y-adapters or signal splitters. Music reaches the amp and passes through it with clarity and fidelity.

Max Power
770W X 1
Rated Power
350W RMS x 1 @ 4 ohms,500W RMS x 1 @ 2 ohms
Input sensitivity/impedance (low-level input)
100mV – 2V/>7k ohms
Input Sensitivity/Impedance (speaker-level input)
Input sensitivity/impedance (speaker-level input) 2V – 15V/120 ohms
Fuse Replacement
25A x 2
6.4 lb (2.9kg)
greater than 80dB ref. 1W
Frequency Response
20Hz – 200Hz (±0.5dB); 10Hz – 300Hz (±3dB)
Height (in)
Width (in)
Depth (in)
Height (mm)
Width (mm)
Depth (mm)

The latest owner's manuals, quick start guides, and documents.

Call us: 1.800.336.4525

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GTX 500 is rated 4.5 out of 5 by 4.
Rated 5 out of 5 by from Big Power, Small Package What else is there to say, great power in a small package. I installed this in my boat (not recommended) and it drives my sub nice and hard.
Date published: 2016-09-04
Rated 5 out of 5 by from Great amp I have the 750 watt version I got the jbl 751ez amp witch is the same amp only more wattage and I have it hooked up to a skar audio vvx v2 subwoofer and it's pushing that sub like crazy I have it in a big sealed box if it was in a ported box I know it would blow the sub and I have the gain almost all the way down and the bass boast is all the way down if I turn both of them up like only a qauter of the way up I can garentee that it will destroy that sub I don't really think this amp puts out 750 rms probably at least 900 rms just watch steve Meade amp test Tuesday when he tested the jbl gto 501 ez series amplifier it put out 712 rms at 2 ohms jbl really under rates these amps I've been doing car audio for over twenty years if your thinking about buying this amp don't think no more buy it you will be very happy
Date published: 2016-07-08
Rated 5 out of 5 by from Clean power and lots of it... I recently purchased this unit and have been very impressed with not only how much boom it delivers, but how it pushes for hours and doesn't break a sweat. I have it hooked up to a Kicker CompR 12" in a Kicker ported box. Power is fed via 8 gauge power and ground w/ 8 gauge copper between the amp and sub as well. I can rattle someone's windows from across the road but I use my setup mostly to provide balanced and clean low range audio in my Jeep. Just make sure your speakers are rated for 500W RMS minimum since JBL has been a bit modest with their power ratings.
Date published: 2016-01-05
Rated 3 out of 5 by from It's a allright amp for the price... I guess I bought this amp a few weeks ago, it's okay for the price. There isn't as many adjustments like most other amp's. I got it on sale so it works for now defnitly will be upgrading in the future, the build quality of it is great tho, cool to the touch.
Date published: 2015-07-24
  • 2016-09-30T08:32CST
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can this amp be used to create a home or outdoor sub with home theater system 

Asked by: V V 777777
The amp is specifically designed to be used in car audio setups. However, if you have corresponding converters such as voltage converters, you can use the amp in a different setup other than car audio setups. The amp only requires 12V to function and home power outlets are rated at 110V or 220V depending on the region. The amp also has a rated power output of 350W RMS x 1 @ 4 ohms,500W RMS x 1 @ 2 ohms and most home theater speakers have a rated impedance of 8 ohms, so it would be an issue of matching the impedance of your speakers to the amp.
Answered by: Amir at Customer Service
Date published: 2016-08-01

 I recently purchased a pair of CX 1200 subs and a GTX 500 amp I'm trying to figure out which input setting I should be using low, H1 or H2 I have a Kenwood head unit with RCAout sub jacks connected to the input RCA's on the amp.

Asked by: Rancho1
If your Amplifier is connected to the RCA leads of the Kenwood, Use the Low setting. And you will need a Remote Turn On lead. Usually a Blue wire in the Radio Harness.
Answered by: Tucsonmax1
Date published: 2016-07-20

My amp has power but won't power the sun so I took it back to Best Buy and got a new one then i hooked it up and it won't work low it's flashes a red light h1 it doesn't play same with h2 I don't know what's happening I've checked everything

Asked by: Mike Marshall
I assume that the vehicle's electrical system is supplying between 9V and 16V DC to the amplifier. If the supply voltage is outside of this range, correct the condition before attempting to use the amplifier. Disconnect all speakers from the amplifier and attempt to turn it on again: – If the amplifier turns on (the Power LED is orange), THIS MEANS THE AMP IS OKAY AND there is a short circuit in one or more of the speaker wires OR SPEAKERS. Correct all short circuits before reconnecting the speakers to the amplifier. – If the amplifier does not turn on (the Protection LED is still red and the Power LED is off), please submit a case at and the Customer Service team will be more than happy to further assist you.
Answered by: Joe G at Customer Service
Date published: 2016-07-12

Will this amp work with the GT5-12

Asked by: Nick88
Thank you for your question, this unit will work with the GT5-12
Answered by: Randy at JBL
Date published: 2016-04-21

Will this amp work for the s2 1024ss sub? If so can it support 2 of them?

Asked by: Nick88
Thank you for your question, unfortunately this will only support 1 S21024ss sub
Answered by: Randy at JBL
Date published: 2016-04-19

can you use the GTO-RBC with this amp to control bass output?

Asked by: mike88
Thank you for your question the RBC is not compatible with this unit
Answered by: Randy at JBL
Date published: 2016-04-06

Will this work with the GT5 or GT5-12??

Asked by: dayshon hurtt
Thank you for your interest or question on this amplifier, yes this will work with the following GT5 Series
Answered by: Randy at JBL
Date published: 2016-03-24

Will this amplifier can provide power for 2 subwoofersJBL S2-1224 1100 watts?

Asked by: allen12
Actually yes you can power 2 subs off this amp. Either select both woofers at 2 ohms, and wire in series, or select both woofers at 4 ohms and wire in parallel. 
Answered by: OldSchool Audio Fanatic
Date published: 2016-03-02
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