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JBL GTR-1001

Mono subwoofer amplifier — 1,000 watts RMS x 1 at 2 ohms

Item # 109GTR1001

JBL's GTR-1001 mono amplifier powers your subwoofer with up to 1,000 watts RMS from a compact chassis that takes up...

Find what Fits your vehicle

JBL's GTR-1001 mono amplifier powers your subwoofer with up to 1,000 watts RMS from a compact chassis that takes up...

Discontinued item
12 questions - 29 answers

Item # 109GTR1001

About the JBL GTR-1001

Bass with style

JBL's GTR-1001 mono amplifier powers your subwoofer with up to 1,000 watts RMS from a compact chassis that takes up very little space. A low-pass filter clears the way for your sub to play clean, powerful bass, while a bass boost and phase switch help you get the sound just the way you want it.

Bass with style

JBL's GTR-1001 mono amplifier powers your subwoofer with up to 1,000 watts RMS from a compact chassis that takes up very little space. A low-pass filter clears the way for your sub to play clean, powerful bass, while a bass boost and phase switch help you get the sound just the way you want it.


This amplifier can accept low- or speaker-level inputs so it'll work in almost any system, and the package includes screw-on RCA-to-bare wire adapters for the speaker-level signal. The GTR-1001 sub amp will integrate perfectly into a system that uses a matching JBL GTR-102 or GTR-104 full-range amplifier with its handy Bluetooth® connection.

JBL GTR-1001

JBL GTR-1001 adjustment panel

Confused about impedance? Check out our article on matching subs and amps.


Product highlights:

  • mono subwoofer amplifier
  • 700 watts RMS x 1 at 4 ohms (1,000 watts RMS x 1 at 2 ohms)
  • variable low-pass filter (32-320 Hz, 12 dB/octave)
  • variable bass boost (0-9 dB at 45 Hz)
  • phase switch (0, 180 degrees)
  • preamp and speaker-level inputs
  • speaker wire-to-RCA adapters included
  • fuse rating: 35A x 3
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 13-1/8"W x 2-3/16"H x 7"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # GTR-1001

What's in the box:

  • Mono amplifier
  • Six 35A ATO fuses (3 installed)
  • 2 Bare wire-to-RCA adapters
  • 4 Mounting screws (M4 x 52mm)
  • Quick Start Guide

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Product Research


Overview: The JBL GTR-1001 is part of the GTR Stadium series of high-performance amplifiers. This Class D mono subwoofer amplifier will accept both high-level and low-level inputs. Class D amplifiers are highly efficient and compact, generating a lot of power without drawing much current or generating heat. The amp comes with spare fuses, speaker wire-to-RCA adapters, and mounting hardware.

Power Output: The GTR-1001 delivers the following power output:

  • 700 watts x 1 at 4 ohms (<0.1% THD+N)
  • 1000 watts x 1 at 2 ohms (<0.1% THD+N)

Protection Circuitry: The amplifier features protection circuitry for thermal overload, over- or under-voltage (<9V or >16V), and short circuits. The LED on the top of the amp glows red if the amp goes into protection mode.

Controls: The GTR-1001's controls are located on one side of the amplifier. The rotary controls require a small screwdriver (not included) to make adjustments. The amp controls include:

  • Gain: The rotary gain control let you match the amp's input sensitivity to the output of the source unit. The input sensitivity range of the amplifier is 0.2V and up for a low-level input, and up to 20V for speaker-level input.
  • Input Level: The Input Level switch lets you select the type of input you are using. For high-level input, there are two settings: Hi1 and Hi2. If the audio system fails to play with an amplifier connected to its output, or you get a "speaker disconnected" message on your factory stereo, set the switch to the Hi2 position. The Hi2 position includes a circuit design to fool this type of factory system into "seeing" a speaker connected to its output.
  • Crossover: The amp features a non-defeatable low-pass filter that determines the upper limit of the frequencies that are sent to the subwoofer. You can adjust the cutoff frequency of the low-pass filter from 32Hz to 320Hz using the rotary control.
  • Bass Boost: The GTR-1001 has a variable 0-9dB bass boost, centered at 45Hz. This allows you to dial in the amount of bass according to your personal taste.
  • Phase Switch: The amp has a 2-way Phase Switch that lets you invert the phase of the speaker output by 180°. When the subwoofer is out of phase with the other speakers in the vehicle, sound waves cancel each other and the bass response suffers. If the bass response is poor, inverting the phase of the subwoofer may improve it.

Connections: The JBL GTR-1001 uses set screw terminals for the +12V power, ground, turn-on (remote) lead, and speaker outputs. The screws can be tightened/loosened with a Phillips-head or flat-head screwdriver (not provided). The amp connections include:

  • Power/Ground: The +12V Power and Ground terminals will accept up to 4-gauge wire. It is recommended that you use a minimum of 4 AWG power wire to the battery, with an in-line 100A fuse (or higher) installed no more than 18" from the battery terminal. A 4 AWG ground wire (minimum) is also recommended, and attached to a metal area close to the amplifier.
  • Remote Turn-On: The Remote screw terminal will accept up to 8 AWG wire. Typically, an 18 AWG turn-on lead is included in an amplifier wiring kit.
  • Speaker Outputs: The amp features screw terminals for connecting two speakers. The terminals are wired internally in parallel. The amp's minimum speaker impedance is 2 ohms, so you can connect one or two 4-ohm subwoofers, a 2-ohm subwoofer, or one subwoofer with dual 4-ohm voice coils.
  • Speaker-Level Input: The amp includes two bare wire-to-RCA adapters for connecting the amp to a factory radio or aftermarket head unit without preamp outputs. You should attach the left and right speaker wires from the head unit to each adapter and plug the adapter's RCA plug into the amp.
  • Line-Level Inputs: The amplifier is equipped with one pair of RCA inputs for connecting stereo RCA patch cables from the head unit to the amp. If your source unit only has one subwoofer output, a "Y" adapter should be used to split the mono signal into two outputs.

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Customer Q&A

12 questions already asked

I have two Alpine Type R 15's will this amp push it ?
[ David  Oct 08, 2018 ]
1 answer
Thanks for your question. For information on selecting the best amp for your subs I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system.
[ Krissy  Oct 15, 2018 ]  Staff
I have 2 RF Prime R2D4 10s. I'm in between on what I should get for them amp wise. I would like a fairly priced product that still operates the subs at a solid level. Is this a good product for that? If not is there is a better option that I can buy from this site? Thank you.
[ Joey  Sep 05, 2018 ]
6 answers
I put that amp on 2 8"polk audio mm842 in a ported box and I love it. My down fall is I have the Sony system factory receiver 2013 f150 and can not change it out. Cruthfield has worked with me on everything from hook up to giving different options. Good luck. I would do it again amp is a deep hitting unit
[ BILL  Sep 13, 2018 ]
This amp has a tremendous amount of power and I have it running 15 L7 and it pushes is hard and stays cool. Now have had it for 10 months no problems . I believe it's the best bang for your buck without compromising.
[ Shawn  Sep 12, 2018 ]
If you run your subs in parallel, then the amp will put out about double the power you need. It will be a great amp for this (just be careful not to overpower the subs) and will give you the option later if you get better subs that can handle more power.
[ Trifone  Sep 12, 2018 ]
I use this amp to power 2 RF punch 2 4ohm 12 inch subs (400watts rms) and its works great. Has plenty of juice,so much so that i have the amp set to less than half the output power. When i had it higher it was too much. Made my skull vibrate
[ Santiago  Sep 10, 2018 ]
Your subs are 4 ohms and this amp pushes 1000w at 2 ohms. Depending on how you wire your subs they are going to run at 4 ohms or 1 ohm. Plus your sbus are rated at 250w rms. I would look for a 500w mono amp that runs at 4 ohms or 1 ohm, (1 ohm is prob easier to find). This amp would push 700w at 4 ohms so you would be fine, plus if you wanted to upgrade your speakers later you could( if you get 2 ohm speakers)
[ john  Sep 10, 2018 ]
Yes, this amp is actually perfect for that. I have. 10 inch w6 connected to this and handles no problem. Especially for the price I was kinda skeptical but it was well worth it! Looks great too!
[ dustin  Sep 10, 2018 ]
The 80hz mark for the freq knob appears to be in different spots for this amp. On mine its at the 1 o clock position above the right line and not above the left line at 11 o clock. Which position is correct?
[ russb  Aug 22, 2018 ]
1 answer
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer.
[ Krissy  Aug 31, 2018 ]  Staff
Can I hook up 2 rockford fosgate p3sd4 12s to this? I'm very confused on ohms and how they work. Thanks.
[ Shane  Jul 06, 2018 ]
1 answer
Shane, the GTR will run both of those subs, albeit at a 4 ohm load. This is accomplished by wiring the voice coils of each woofer in series and then wiring both subs together in parallel to the amp. I know that may sound confusing but there is a wiring diagram on this site that shows wiring DVC's in series. So, on one sub, run 1 wire from the NEG on 1 VC to the POS on the opposite VC. (VC is a voice coil) Do the same on the other sub. This will leave you with an open NEG and POS on each sub, 1 per VC. Now wire those 2 NEG terminals (1 on each sub) together and do the same with the 2 open POS terminals. These are the 2 wires that need to be presented to the amp, meaning you can then run a wire from one of those POS terminals you just hooked together and one from the NEG terminals and you will present a 4 ohm load to the amp. A picture is worth a 1000 words, especially true in this case. TBH, if you haven't bought this amp yet, I would look for a 1 ohm stable amp and then you would simply run everything in parallel and present a 1 ohm load to the amp. If you already have the amp, I am sure it will sound good, even at a 4 ohm load. The amp is rated at 700 watts @ 4 ohm's, meaning each sub would see 350 rms watts. These amps are known to be slightly underrated. If you haven't purchased the subs yet and want the amp, I would opt for the 2 ohm DVC. Wiring those in series/parallel will allow a 2 ohm load to be presented to the amp. This will allow the amp the pump out the 1000 watts rms, 500 to each sub. Hope this helps and GL.
[ JOSH  Jul 10, 2018 ]
Which wiring kit would I need for two kicker comprt?
[ Niiicckk  Feb 13, 2018 ]
1 answer
This isn't an answer for which kit but tells you how to wire your subs, your looking for a final resistance of 2 ohms to take advantage of the full potential of the amp. go to jl audio website click on support and then speaker wiring tutorials. Hope that helps a bit.
[ Stephen  Feb 13, 2018 ]
will this amp push two alpine type r 2ohm 12's?
[ weasy  Jan 17, 2018 ]
6 answers
Yes without a problem
[ DENNIS  Jan 19, 2018 ]
If you connect the speakers in series then yes you can. However, the amp will NOT have anywhere near enough power for both of them. I have one hooked up to this amp and it is amazing
[ Trifone  Jan 17, 2018 ]
Correction. Yes, but it depends how many rms watts.
[ Sarilyn  Jan 17, 2018 ]
[ Sarilyn  Jan 17, 2018 ]
If they are dual voice coils, yes, if not I wouldnt
[ john  Jan 17, 2018 ]
Yes but not well. This amp is better suited for 1 of those 12s.
[ Tim  Jan 17, 2018 ]
Is this amp blue tooth?
[ G  Dec 21, 2017 ]
3 answers
No, it's a mono sub amp. Their multi channel amps in this series are bluetooth. All info including owner's manuals and specs are found on JBL's website.
[ Stephen  Dec 21, 2017 ]
Hi there. This particular amp is not BT. The GTR 104 is and the 2 amps can run together since the GTR 104 has the control unit. The GTR 104 is a small, albeit very powerful 4 channel. I have both amps. Hope this helps.
[ JOSH  Dec 21, 2017 ]
It's supposed to be but it didn't work for me. I called JBL and they didn't know how to help me and said they would call me back but never did. So I don't think it is
[ Richard  Dec 21, 2017 ]
Is this amp blue tooth?
[ G  Dec 21, 2017 ]
3 answers
[ tom rover  Dec 21, 2017 ]
[ Justin  Dec 21, 2017 ]
Crutchfield has the info on their site. Customer service good. Prices. Not so good !!! Less elsewhere after i bought it Seems to be the case w almost everything i buy here!!?? Oh well thx jc
[ JOHNNY JC  Dec 21, 2017 ]
would this amp be able to push two MTX Audio FPR12-02 Shallow Mount Subwoofers an would it be better two get two subs at 2 ohms or 4 ohms?
[ chase48  Nov 09, 2017 ]
4 answers
It should do it no problem
[ DAVE  Nov 09, 2017 ]
This amp is a great choice to run two of these subs. Make sure you get the 4 ohm version. The amp won't be able to run two at 2 ohms
[ Trifone  Nov 09, 2017 ]
Yes since those subs take 400 rms each they should be able to handle this JBL amp at 4 ohms very well
[ Marcos  Nov 09, 2017 ]
Yes this amp would be a real good match actually. Pushing 2 4 ohm subs parallel you'd get a 2 ohm load. At 2 ohms this will make 1000 watts rms. So you'd get about 500 watts rms to each sub, which is slightly over the 400 watts rated for the sub, but you'll be fine as those mtx subs will handle it. I wouldn't worry about the amp or the subs, they are good, just be sure to make or buy a good enclosure to spec.
[ Zach  Nov 09, 2017 ]

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