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Mono subwoofer amplifier — 750 watts RMS x 1 at 2 ohms

6 Reviews

Item # 109GTO751E

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Our take on the JBL GTO-751EZ

Efficient bass power always set correctly
JBL's compact GTO-751EZ amplifier will drive your subs with up to 750 watts RMS, bringing exciting, visceral impact to the music in your car. This mono amp looks very cool with its "old-school" styling, and JBL includes a few innovations that really separate this amp from the others.

Efficient bass power always set correctly
JBL's compact GTO-751EZ amplifier will drive your subs with up to 750 watts RMS, bringing exciting, visceral impact to the music in your car. This mono amp looks very cool with its "old-school" styling, and JBL includes a few innovations that really separate this amp from the others.

Simple Setup System for setting amp gain
One of the biggest problems with installing an amplifier is setting the gain properly. JBL has come up with a fool-proof method for getting it right, ensuring full-power performance and distortion-free play. Using test tones on the included setup CD, you adjust the gain knob until the yellow light or the red light goes off, and the green "Gain OK" light comes on — it's that simple. You'll never have to worry again about your amp "clipping" the signal, and possibly damaging your speakers or subs.

Plays well with factory radios
This GTO amp comes with screw-on bare wire-to-RCA adapters that let you hook up the amp, using your car's factory speaker wiring to supply the input signal. In some vehicles, the factory radio shuts down when you try to tap into the speaker wires, displaying a "no speakers are present" message. This amp features a special circuit that fools those factory radios by simulating a speaker load. The onboard crossovers and bass boost let you fine tune the system to perfection, and the large recessed knobs mean you don't need a tiny screwdriver to make your adjustments.

GTO-751EZ input panel

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

Product Highlights:

  • mono subwoofer amplifier
  • 500 watts RMS x 1 at 4 ohms (750 watts RMS x 1 at 2 ohms)
  • CEA-2006 compliant
  • frequency response: 10-280 Hz
  • Class D amp technology
  • variable low-pass filter (40-280 Hz, 12 dB/octave)
  • variable bass boost (0-12 dB at 45 Hz)
  • Simple Setup System with test tone CD for perfect gain setting
  • optional wired remote level controller available soon
  • preamp and speaker-level inputs (speaker wire-to-RCA adapters included)
  • switchable automatic signal-sensing turns on amp without need for remote lead
  • fuse rating: 40A x 2
  • 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 12"W x 2-5/8"H x 9-11/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

Simple install, great audio, and a sleek look.

Brandon, Owings Mills, MD

What's in the Box:

  • Mono subwoofer amplifier
  • Two 40-amp ATO fuses (installed)
  • 2 Speaker wire to RCA adapters
  • Setup CD
  • Warranty information
  • Owner's manual (English/ German/ French/ Spanish/ Dutch/ Italian/ Swedish/ Danish/ Finnish/ Korean/ Japanese/ Chinese/ Russian/ Polish/ Portuguese/ Turkish/ Indonesian)

JBL GTO-751EZ Reviews

Average Customer Review(s):

(6 Reviews)

Awesome Amp

Brandon from Owings Mills, MD on 6/1/2013

Crutchfield Customer Review (What's this?)

Simple install, great audio, and a sleek look.

Pros: Style, price, quality, simplistic set up

Cons: Tuning CD is rather useless

Enough power for my JBL MS series subs

Steve H from Claremont, NH on 4/14/2013

Crutchfield Customer Review (What's this?)

Great amp for the price. I did however find the setup cd to be useless. Maybe I will try it again at some point but found that tuning was made easy enough without it. The pair of subs hit strong and clear. No complaints.

Pros: Clean design. Easy to access adjustment knobs. Great size for the power it produces.

Cons: Test/setup cd is useless.

Good amp!

Ryan from Pasadena, MD on 3/22/2013

Crutchfield Customer Review (What's this?)

All around good amp. Plays as loud as I want it to and it can go louder!



excellent amp

me from pa on 3/18/2013

I bought this amp thinking I was going to loose power. This wasn't the case and now I need to buy a speaker that can take full advantage of this amp.



good buy

Anonymous from menominee on 9/12/2012

Crutchfield Customer Review (What's this?)

Great amp, way more power than I thought, got it powering 2 Kenwood kfc w3013ps from Crutchfield and I barely even have it at 1/4 gain with about 1/2 bass boost and it pounds hard, and it still has plenty of power to spare. Great amp, well worth the money and it never gets hot either, best amp I've ever owned so far

Pros: Heavy, well built Doesnt overheat Has more power than it says

Cons: Only takes 6 gauge wire, wish it took bigger, 4 would work but it would be tight

Great Product.. But...

Giovanny from Boston, MA on 6/9/2012

Crutchfield Customer Review (What's this?)

JBL makes a very great product. Solid amps small easy to install.

Pros: Small fits anywhere. Gain LED's

Cons: Signal Power on is not reliable (make sure you run a remote wire)


Hands-on research

Product Research



Setup Disc: The included setup CD is used to optimize the input gain. A test tone is output from the disc and the Gain LEDs on the amp (green, yellow, red) guide you through adjusting the gain controls.

Note: The instructions in the first version of the manual indicate the radio should be at full volume when playing the setup disc; this is wrong and JBL is in the process of correcting the manual. The volume should actually be as high as possible without distorting the signal; this will be different for every radio, but approximately 3/4 volume is typical.

Auto Turn-on: The GTO-751EZ has a signal sensing automatic turn-on circuit; it will turn on whenever an audio signal is present at the RCA inputs. The amplifier will automatically turn off approximately five minutes after the input signal ceases. If you prefer to use the radio's remote lead, the auto turn-on feature can be turned off.

Crossovers: Because this is a subwoofer amplifier, the low-pass crossover cannot be bypassed. The crossover point is continuously variable from 40 Hz to 280 Hz and the crossover's slope is 12 dB/octave.

Audio Input: If your radio has no line-level outputs, use the included adapters to convert the speaker wires to RCA and plug them into the amplifier's inputs. The input level switch has a Hi2 position, used to present a speaker load to factory radios equipped with a circuit that turns the radio off when an amp is connected.



  • Crossover Frequency: rotary knob; continuously variable from 40 Hz to 280 Hz
  • Input Gain: rotary knob (the gain LEDs are above the knob)
  • Bass Boost: rotary knob; continuously variable from 0 to +12 dB; boost centered at 45 Hz

Right Side:

  • Input Level: three position switch; Low, Hi1, or Hi2 (used only with factory radios having a circuit that turns the radio off when it sees no speaker load)
  • Gain LEDs: on/off


  • Auto Turn-on: on/off


Left Side:

  • Power and Ground Terminals: set screw terminals; accept up to 4 gauge bare wire
    • Note: JBL recommends the power and ground cables be 8 gauge minimum. However, because the GTO-751EZ has two 40 amp fuses (80 amps total), we recommend using 4 gauge power and ground wire.
  • Remote Turn-on Terminal: set screw terminal; accepts up to 8 gauge bare wire
  • Speaker terminals: one pair of set screw terminals; accepts up to 8 gauge bare wire
  • Fuses: two ports for 40-amp ATO fuses (fuses are factory installed)

Right Side:

  • Audio Input: left and right female RCA jacks; compatible with a speaker level signal using the included adapters
  • Remote: RJ-25 jack (the wired remote is not yet available as of 2/21/12)

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.