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JBL GTO-751EZ

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

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  • JBL GTO-751EZ

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  • JBL GTO-751EZ

  • JBL GTO-751EZ

  • JBL GTO-751EZ

  • JBL GTO-751EZ

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Our take on the JBL GTO-751EZ

by Buck Pomerantz
JBL

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

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

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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

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Performance
RMS Power Output (Watts x Channels)
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500 x 1
Peak Power Output (Watts x Channels)
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1200 x 1
Power at 2 Ohms (Watts x Channels)
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750 x 1
Bridged Power (Watts x Channels)
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N/A
Minimum Impedance Bridged
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N/A
Minimum Impedance Unbridged
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2
Best Frequency Response
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10-280 Hz
THD at Rated RMS Power
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1%
Signal to Noise Ratio
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80 dB
Input Voltage
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14.4v
Features
Amplifier Class
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D
Low-Pass Crossover Frequency
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40-280 Hz
Low-Pass Slope (dB/octave)
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12 dB/oct
High-Pass Crossover Frequency
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N/A
High-Pass Slope (dB/octave)
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N/A
Bass Boost
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0-12 dB
Bass Boost Frequency
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45 Hz
Fan Cooled
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No
Fuse Rating
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80
Speaker Level Inputs
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RCA
Preamp Outputs
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No
Width (inches)
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12
Height (inches)
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2-5/8
Depth (inches)
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9-11/16
Parts Warranty
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1 Year
Labor Warranty
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1 Year
Product Research
What's in the box?

Download owner's manual

  • 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)

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 open the box, verify contents, 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.

Features
Controls
Connections

Features

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.

Controls

Top:

  • 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

Bottom:

  • Auto Turn-on: on/off

Connections

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)
 

Product reviews from the Crutchfield Labs (what are the Labs?)

Video: JBL GTO amplifiers

Video: JBL GTO amplifiers

by Zak Billmeier
 
Video: JBL GTO amplifiers

Zak got a chance to check out the new JBL GTO car amps at CES. Chris from JBL takes us through the line and shows us that no matter what you've got planned, JBL has a GTO amp for you.

 
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JBL GTO-751EZ Reviews

Average Customer Review:

6 people say:

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Filter by rating:
5 out of 5

Awesome Amp

Written By Brandon, Owings Mills, MD on Saturday, June 01, 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
Was this review helpful?    Yes | No
 
5 out of 5

Enough power for my JBL MS series subs

Written By Steve H, Claremont, NH on Sunday, April 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.
1 out of 1 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

Good amp!

Written By Ryan, Pasadena, MD on Friday, March 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!
1 out of 1 people found this helpful
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5 out of 5

excellent amp

Written By me, pa on Monday, March 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.
1 out of 1 people found this helpful
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5 out of 5

good buy

Written By Anonymous, menominee on Wednesday, September 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
4 out of 4 people found this helpful
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4 out of 5

Great Product.. But...

Written By Giovanny, Boston, MA on Saturday, June 09, 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)
5 out of 6 people found this helpful
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For a more in-depth review and enhanced detailed information on the JBL GTO-751EZ, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_109GTO751E/JBL-GTO-751EZ.html ).