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JL Audio HD Series HD750/1

Mono subwoofer amplifier — 750 watts RMS x 1

Item # 136HD7501

HD Series amplifiers reproduce your music with exceptional accuracy, so you'll hear high-fidelity sound even under...

HD Series amplifiers reproduce your music with exceptional accuracy, so you'll hear high-fidelity sound even under...

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About the JL Audio HD Series HD750/1

Small amps, big power

HD Series amplifiers reproduce your music with exceptional accuracy, so you'll hear high-fidelity sound even under the most demanding conditions. JL Audio uses Single Cycle Control™ technology to eliminate the excessive signal distortion that's plagued Class D amplifiers in the past. Differential-balanced inputs eliminate noise before it hits the preamp stage, and allow you to connect the amp to just about any in-dash stereo. You'll hear clear, true, studio-quality audio, exactly what you expect from JL Audio.

SAFETY RECALLNote from Crutchfield: We've confirmed that the HD750/1 amps currently in stock are not part of this recall from JL Audio. If you bought an HD750/1 amp after July 2008, please check with JL Audio to see if your amp needs to be sent back for repair.

Small amps, big power

JL Audio's HD Series amplifiers offer high performance from an ultra-compact chassis. These Class D amplifiers use less power, take up less space, and generate less heat than traditional amp designs — you can even stack them up to create a sweet-looking installation.

View of control panel

JL Audio technology goes to work for you

HD Series amplifiers reproduce your music with exceptional accuracy, so you'll hear high-fidelity sound even under the most demanding conditions. JL Audio uses Single Cycle Control™ technology to eliminate the excessive signal distortion that's plagued Class D amplifiers in the past. Differential-balanced inputs eliminate noise before it hits the preamp stage, and allow you to connect the amp to just about any in-dash stereo. You'll hear clear, true, studio-quality audio, exactly what you expect from JL Audio.

Reliable power for your subs

The HD750/1 class D mono amplifier pushes 750 watts RMS to your sub, from a 2" tall chassis that's about the size of a sheet of computer paper. The regulated power supply allows this amp to deliver its rated power to a wide range of impedances (1.5 to 4 ohms), even when voltage levels drop during heavy use. Removable power and speaker plugs make it easy to pop this amp out if you need the space in your cargo area.


Some extra touches

You can use JL Audio's optional stack kit to mount one HD Series amp on top of another, so you can maximum power from minimum space. JL's wired remote allows you to control your HD amp's volume from your front seat.

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

READ LESS

Product highlights:

  • mono subwoofer amplifer
  • 750 watts RMS x 1 (rated power from 1.5 to 4 ohms)
  • variable high- and low-pass filter (50-500 Hz 12 or 24dB/octave)
  • subsonic filter and output polarity control
  • removable power and speaker plugs
  • optional wired remote for level control
  • optional HD stacking kit for stacking multiple HD amps together
  • Class D amplifier design
  • MOSFET power and output stages
  • differential-balanced inputs eliminate noise from your vehicle's electrical system
  • speaker- and preamp-level inputs (speaker-level input requires an optional adapter)
  • preamp outputs
  • 4-gauge power and ground leads and a 80-amp fuse recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 60-amp in-line fuse between the distribution block and the amplifier is recommended
  • 10-13/16"W x 1-15/16"H x 8-13/16"D
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # 98220

What's in the box:

  • Monoblock full-range class-D amplifier
  • Power/Ground/Turn-On plug
  • Speaker connection plug
  • 4 Mounting brackets
  • 2mm Allen-wrench
  • 2.5mm Allen-wrench
  • 5mm Allen-wrench
  • 4 Mounting bolts
  • Owner's Manual

Customer reviews

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JL Audio HD Series HD750/1 reviews

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Features
Controls
Connections

Features

Monoblock Full-Range Class-D Amplifier: The JL Audio HD750/1 is a very powerful and compact monoblock (single channel), full-range amplifier utilizing patented Single Cycle Control Class D technology. This technology delivers reference grade sonic performance while requiring far less current from the vehicle's electrical system than a conventional amplifier. Unlike most monoblock amplifiers, the HD750/1 is a full-range design so it can be used as a subwoofer amplifier or as a very powerful full-range or satellite amplifier using a second 750/1 to form a stereo pair.

Amplifier Rating: The JL Audio HD750/1 Class D monoblock, full-range amplifier is rated at 750 Watts RMS x 1-channel in 1.5 to 4-ohm at 20 to 20kHz with a signal-to-noise-ratio of 111 dB and a total harmonic distortion of 0.03% while receiving 11 to14.5 Volts.

High-Fidelity Class D (HD) With Single-Cycle Control: The JL Audio HD750/1 utilizes patented Single Cycle Control Class D technology for all channels. This technology delivers reference-grade sonic performance while requiring far less current from the vehicle's electrical systems than a conventional amplifier. Single Cycle Control is a unique approach to controlling a full-range Class D amplifier. By tracking the audio signal, comparing it to the real PWM waveform and then correcting it in each and every cycle (over 400,000 times per second), a multitude of distortion-causing mechanisms can be tightly controlled to enable pristine amplification. While there are certainly less expensive ways to make a full-range switching amplifier, no other Class D control system works faster or more accurately than Single Cycle Control.

Compact/Efficient Design: The JL Audio Class D amplifier on average is 13% smaller overall and over 1/2-inch shorter in height than most class AB amplifiers. The HD750/1 features outstanding overall efficiency (80% at 1/2 rated power) which allows for huge power from a tiny chassis and is easy on your vehicle's charging system, drawing 60% less current than a class AB design of equal power.

R.I.P.S. (Regulated, Intelligent Power Supply): R.I.P.S. stands for "Regulated, Intelligent Power Supply" and is a central feature of the JL Audio HD amplifier. The JL Audio R.I.P.S. System ensures consistent power delivery over a wide range of battery voltages and load impedances. This technology provides optimum power at any impedance level between 1.5 ohm to 4 ohm per channel and at any vehicle voltage level between 11V and 14.5V.

  • Regulated Power Supply: "Regulated" means that the power supply adjusts its operation so as to maintain the amplifier's rated power output and low distortion operation over a wide range of vehicle voltages (11V-14.5V ). This allows the JL Audio HD amplifier's rail voltage and clean power output to remain stable in real-world car-audio systems, resulting in superior fidelity and stability.
  • Intelligent Power Supply: The "Intelligent" portion of the R.I.P.S. System is a circuit that actually monitors output current to optimize the amplifier's output power over a wide range of load impedances (1.5 ohm to 4 ohm per channel). The R.I.P.S. System detects the actual impedance being driven and adjusts output rail voltages to deliver optimum output. The entire process is seamless, automatic, and results in incredible dynamics for satellite channels and consistent power output for a wide range of subwoofer configurations. It also takes into account the real impedance of your car-audio system, rather than relying on often inaccurate assumptions based on a speaker's rated impedance.

RealSink Heat Management With Rollback Protection: This JL Audio amplifier employs an advanced type of heat management, called RealSink. This features takes advantage of convection and radiation effects to remove heat from the amplifier circuitry. For optimum cool performance, the vertical heat sinks located at the sides of the amplifier should be exposed to as large a volume of air as possible. If a JL Audio HD amplifier should ever reach an unsafe temperature, its unique Advanced Rollback Protection circuit also adjusts power until the amplifier cools down, without ever shutting your music down.

Differential-Balanced Inputs: The JL Audio amplifier features differential-balanced input architecture to effectively control noise and ensure compatibility with a wide variety of source units, including many OEM systems. Without resorting to line output converters, you can directly connect most OEM source units to the JL Audio amplifier without creating any noise or compatibility issues. Unlike conventional single-ended inputs, the differential-balanced design does not connect one side of the audio signal to chassis ground. This eliminates any voltage sensitivity between one input terminal and ground and greatly reduces the incidence of alternator whine in a typical car audio installation. The JL Audio HD amplifier provides range switching on each of its inputs via the "Input Voltage" switch. This permits connection to a wide range of source voltages while retaining excellent sensitivity setting precision.

Note: You will need a speaker wire to RCA adaptor (136XDCLR2S, sold separately) to connect this amplifier to your headunit via speaker-level.

Protection Circuitry With Status Indicator Lights: There is a single multi-color LED on the control panel of the amplifier to indicate the amplifier's operating status.

  • Flashing Green: When the LED is flashing green, the amplifier is powering up and audio output is muted.
  • Constant Green: This LED lights green to indicate that the amplifier is turned on and operating normally.
  • Constant Red: This Red LED lights to indicate that the amplifier has exceeded its safe operating temperature, putting the amplifier into a shelf-protection mode, which reduces the power output of the amplifier. The red light will shut off and the amplifier will return to normal, full-power operating mode if the heat sink temperature drops back to a safe level.
  • Constant Yellow: This amber LED lights to indicate that the impedance of the speaker load connected to the amplifier is lower than the optimum impedance load range for the amplifier. When this light is on, a protection circuit engages and reduces the power output of the amplifier. The amber indicator will also light when a short-circuit is detected in the speaker wiring.
  • Alternating Red/Green: The LED alternated between Red and Green to indicate that the amplifier is experiencing a fault that may require service of the amplifier, its wiring, or the vehicle's operating system. Audio is muted when this fault occurs.
Note: There is only one condition that will shut down the HD750/1 completely and that is if the battery voltage of your vehicle drops below 10 volts.

Mounting Options: The HD750/1 has two mounting option to choose from during installation.

  • Standard Mounting: The standard method of mounting requires removal of the four corner caps with the 3/16-nch he-wrench included with the amplifier. Using the appropriate mounting screws (not included), you can then secure the amplifier in all four corners and replace the corner caps.
  • Lateral Mounting Feet: Lateral Mounting Feet are also included with the HD750/1 to provide an alternative mounting option. Each mounting foot should be attached to the bottom of the amplifier by screwing the provided bolts into the bottom of the amplifier and up into the corner cap with the supplied 1/8-inch hex-wrench. Then, using the appropriate mounting screws (not included), you can secure the amplifier by its four lateral mounting feet.

Controls

Control Panel Cover: The HD750/1 features a Control Panel Security Cover which protects and hides the amplifier's controls. When installed, the cover ensures that the amplifier's settings are not accidentally changed while creating a clean aesthetic look for the amplifier and your installation. The control panel security cover is pre-installed at the factory and must be temporarily removed for access the amplifier's controls. The security cover is secured by a single 2.5mm hex-head screw.

Simplified Gain Setting: The amplifier's R.I.P.S. feature also allows for easy gain setup. Because the amplifier will always deliver the same amount of power within its operational range of impedances and supply voltages, the maximum, unclipped output is very predictable. This makes setting the gain level of the amplifier via the input sensitivity control very simple. All you need is Digital AC Voltmeter (142TK12V, sold separately) and a Test CD Disc (503CD104, sold separately) with a sine-wave test-tone recorded at 0 dB reference level in the frequency range to be amplified for that set of channels (50 Hz for subwoofer channels, 1 kHz for a midrange application).

Flexible Input Section And Active Crossover Network: The JL Audio HD amplifier provides a flexible input section and a comprehensive crossover network to fine tune your system effectively and accurately. The variable filter design employed in the JL Audio HD amplifier crossover sections allow you to seamlessly switch slopes, easily change filter frequencies and address what frequencies the preamp outputs will pass. The HD750/1 offers the following independent crossover adjustments behind a removable cover plate.

  • Filter Mode: The amplifier features a Full-Range, variable Low-Pass or variable High-Pass filter mode for the amplifier's preamp input section.
  • Switchable Slope on all filters: 12dB/octave Butterworth or 24dB/octave Linkwitz-Riley alignments allowing for more precise integration of subwoofer and speaker channels.
  • Variable Frequency: Fully-variable frequency selection from 50-500 Hz for high-pass or low-pass crossover.
  • Infrasonic Filter: The Infrasonic Filter is a 24 d/b/octave high-pass filter, with a fixed cutoff frequency of 30 Hz. This filter is designed to conserve amplifier power and protect subwoofer systems, without audibly degrading the sub-bass output.

Output Polarity Control: Depending on the distance relationship of the mid-bass speakers and the subwoofers in your system, it can be desirable to reverse the polarity of the subwoofer system in order to produce a better transition between subwoofer and midbass speaker output. The amplifier's Output Polarity switch allows you to quickly perform this polarity inversion.

Connections

Power/Ground/Turn-On Plug: The amplifier features a Power/Ground/Turn-On plug which detaches from the amplifier to make connecting your power, ground, and remote turn-on lead wires more convenient. Once your connections are made the Power/Ground/Turn-On connector simply plugs into the amplifier.

  • Power and Ground: The JL Audio amplifier's set-screw Power and Ground connections found on the detachable Power/Ground/Turn-on plug are designed to accept 8 to 4 AWG power wire. A 2.5mm hex-wrench is supplied for making connections.
  • Remote Turn-On: The JL Audio HD amplifier's set-screw turn-on lead found on the Power/Ground/Turn-on plug will accept 18 to 8 AWG wire. The same 2.5mm hex-wrench is supplied for making connection.

Note: The Amplifier is not equipped with a fuse. An external 60-amp AFS, AGU, or MAXI fuse (not included) must be installed on the power wire. If a wiring kit is used which includes a fuse with a value other than 60-amps, the original should be replaced with a 60-amp fuse.

Speaker Output Plugs: The amplifier features one Speaker Output plug which detaches from the amplifier for easier speaker wire connection. Once your speaker wires are connected to these plugs, they simply push into the amplifier. The Speaker Output plug features four set-screw terminals for an easy parallel subwoofer connection. The HD750/1 amplifier's four set-screw speaker terminals found on the Speaker Output plug will accept 16 to 8 AWG speaker wire. A 2.0mm hex-wrench is supplied for making connections.

Preamp Inputs: The amplifier features one set of differential-balanced RCA jack inputs. The amplifier features a dedicated Input Sensitivity gain control for these inputs. These controls are designed to match the input sensitivity of the HD750/1 to the specific signal source that is feeding it. The amplifier's input level can be set to Low (200mV-2V RMS) when connecting the amplifier to a low-level preamp signal or set to High (800mV-8V RMS) when connecting the amplifier to a high-level speaker signal.

Preamp Outputs: The HD750/1 incorporates a pass-through preamp output sections, so that additional amplifiers can easily be connected to the same signal(s) feeding the HD750/1. These preamp output signals are buffered to prevent noise and are always preamp level, regardless of the level of signals feeding the HD750/1's inputs.

Remote Level Control: The amplifier features a standard telephone connector for adding an optional wired remote level control. With the addition of the optional wired Remote Level Control (136HDRLC, sold separately), you can control the volume of the HD750/1 form the front of your vehicle. This is useful for subwoofer level control. If desired, multiple HD amplifiers can be controlled from a single HD-RLC controller using a simple phone line splitter and multiple phone cables (all sold separately).

Note: All inputs and outputs are located on the rear side of the amplifier to make installation of the amplifier simple and neat.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Recommended with the steathbox I purchased [ Omar  Jul 08, 2019 ]
A
have a JL Audio XD 500/3 that has been a great amp since 2012. Going to pair this amp with an Alpine R-W12D4 750 watts RMS. I have a mounting location under my passenger seat that this will fit in. It seems that JL Audio makes some quality mobile products. [ Ron  Nov 15, 2018 ]
A
recommended by website [ Jeffrey  Apr 17, 2018 ]
A
Because it's the best for its size . And the amp will push it nicely!!! [ K  Mar 31, 2017 ]
A
jl name [ K  Mar 21, 2017 ]
A
Drives my JBL W12GTi MKii subwoofer beautifully. No problems whatsoever and the wiring flexibility is wonderful! [ M  Feb 08, 2017 ]
A
I spoke with JL Audio and Crutchfield about this amp for the StealthBox for a 2016 Tundra Crew Max and they both suggested it. How can you go wrong the the designers of the subs to you which amp with work best with the product. JL did give me another option, if some of you are thinking they just wanted me to buy this one. But, I decided on this one of the two. If, you are going to do it, do it right the first time. [ Alonzo  Dec 15, 2016 ]
A
i havent try it but i hope is worth the money [ CARLOS  Sep 24, 2016 ]
A
Reviews and JL audio reputation of quality. [ Shiva  Jul 09, 2016 ]
A
Reviews and I ordered a JL subwoofer. [ Winston  May 28, 2016 ]
A
Best audio equipment out there. [ Brad  Apr 06, 2016 ]
A
I chose the JL Audio HD750/1 because it is the perfect mate for my 2 JL Audio W3v3 12's. I also chose to buy it from crutchfield because their customer service is hands down the best in the business! [ Robert  Feb 10, 2016 ]
A
Because it was recommended as a good fit for the stealthbox [ Shannon  Jan 01, 2016 ]
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12 questions already asked

Q
Is 4 AWG power and ground cable large enough? Would 1/0 AWG improve the performance at all?
[ Kendrick  May 28, 2019 ]
1 answer
A
4 gauge power wire is all that this amp needs to play its best. The only reason to install 1/0 gauge wire is if you plan on having a second amp installed along with this one My Bio: https://www.crutchfield.com/bio/Paul
[ Paul  Jun 05, 2019 ]  Staff
Q
Would this drive a Morel Ultimo Titanium SC 104 efficiently? Sealed MDF stackfab enclosure .55 cubic ft.
[ Kendrick  May 28, 2019 ]
1 answer
A
This amp is an excellent match for that subwoofer and will drive it just fine My Bio: https://www.crutchfield.com/bio/Paul
[ Paul  Jun 05, 2019 ]  Staff
Q
is this amp good for 1 W6 12"?
[ Sarab  Mar 30, 2019 ]
1 answer
A
It will push that W612 to the max.. this is really designed for a single W712 to be played in a safe power range.
[ Matt  Apr 08, 2019 ]
Q
I have a JL Audio 750 1 amp. What should the subwoofer Watts ohms and RMS be for 1 subwoofer and the subwoofer Watts ohms and RMS for two subs?
[ Travis  Feb 14, 2019 ]
2 answers
A
Rms for can b 750 I personally don't recommend nothing under 600 for 1 sub on that sold and powerful amp.. ohms 4 Now for 2 subs 300 r 350 each but at 2 ohms
[ Alicia  Feb 19, 2019 ]
A
This amp is made for one W7.. if you run two subs off this amp it simply splits the power and ohms in half to each sub.
[ Matt  Feb 19, 2019 ]
Q
Why is does this amp cost almost 5 times more than a Rockville amp with the same rms power?
[ vader1010101  Mar 11, 2018 ]
1 answer
A
There is a lot of extra technology in this amp that is not in Rockford amps to help make this amp more stable and less likely to shut down should the sound wave get clipped. Also, JL Audio amps typically adds less noise to the audio during the amplifying process and have better inputs to help keep the signal to noise ratio up to also help keep out noise. Feel free to call an advisor on 1-800-324-9695 for a breakdown on all the differences in these amps and a recommendation on which will best meet your goals My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=101
[ Paul  Apr 02, 2018 ]  Staff
Q
Where should the 80amp fuse go? I know that when I had the jl xd600 watt amp hooked up first, they put a 60watt amp somewhere. Should this same one be replace with the recommended 80 watt amp since I now have the hd750 hooked up instead?
[ James  Mar 02, 2018 ]
2 answers
A
Then big fuse goes on your hot wire (power) between your battery & your amp (close to the battery)
[ DERRICK  Mar 17, 2018 ]
A
Not sure I completely understand. Typically you would put a fuse inline on the positive heavy gauge wire going from the battery to the amp. Usually 4 or 6 gauge wire. The amp also has as a fuse
[ Todd  Mar 17, 2018 ]
Q
I am curious about purchasing this amp to power two 2 ohm DVC subs. The manual for the JL HD750 states that it has 2 sets of "?+" and "-" connectors that are connected in parallel inside the amp. How would I be able to Wire two 2 ohm DVC subs to this amp? I am assuming the regulated power supply will allow for a final load of 2 or 4 ohms?
[ Ben  Feb 13, 2018 ]
1 answer
A
The HD750/1 supports final output impedances ranging from 1.5ohm - 4ohm. The output stage is just like every other mono-block amplifier in that all of the + outputs are common as are the - outputs. Assuming your subs are dual 2 ohm VCs, you should wire each sub at 4 ohm (VCs in series) and plug each sub into a separate +/- pair on the amp. This will generate a combined resistance of 2 ohms at the amplifier. If the subs are dual 4 ohm VCs, you should still wire the sub in series, but will get two 8 ohm subs but the two subs will combine to 4 ohms at the amp, when wired in parallel, which is still withing the power range of the amp (1.5 ohm - 4 ohm).
[ RICHARD  Feb 14, 2018 ]
Q
The best box for HD 750/1 amp ?
[ K  Apr 05, 2017 ]
3 answers
A
Box selection is completely independent of amplifier selection. Instead use the speakers themselves, the sound desired (boomy=ported, extended range & power handling/small size=sealed). That said, any speaker(s) that can handle this much power will require a very rigid box.
[ RICHARD  Feb 14, 2018 ]
A
I'm running mine on a 12W7 H0 box. It slams. Just make sure it will fit in your car. ??
[ LANCE  Apr 05, 2017 ]
A
You can go with a pretty good sealed box. I have this driving two low profile JL audio subs in a sealth enclosure for my silverado.
[ Shiva  Apr 05, 2017 ]
Q
Will this amp power two 10 inch W6 subs in a sealed box just fine?
[ jbflores95  Mar 30, 2016 ]
5 answers
A
I run a single 10W7 in a sealed box with this without issue. With two 10W6s (wired at 4 or 8 ohms/sub, depending on model) I would opt for the HD1200/1 instead so you never push the amp into clipping. Warning though, these amps are so clean you may not notice overdriving until you are substantially beyond the rated power so calibrate with the proper test tones as directed in the manual and not by ear.
[ RICHARD  Feb 14, 2018 ]
A
I'm really not sure, but they power two 10" W3 for me at half gain only. This amp provides so much power that I will never utilize. So if the W6 is similar in Specs to the W3 then it's probably a good match.
[ Shannon  Mar 31, 2016 ]
A
You will be very impressed. Clean power.
[ Jarad  Mar 30, 2016 ]
A
Definitely.
[ Ankur  Mar 30, 2016 ]
A
I have the following: Custom-fit fiberglass enclosure with two 12" 12TW3-D4 subwoofers - fits select 2007-up GM crew cab trucks (Black) And it's plenty!
[ Swayned  Mar 30, 2016 ]
Q
How to connect it to two 4 ohms sub?
[ Dong  Aug 03, 2015 ]
1 answer
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. 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. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.
[ Krissy  Aug 05, 2015 ]  Staff
Q
Hello! Will the date of manufacture of these items as well as the serial number is how much?? How do I know this article is not a problem that group?
[ Meng-chang  Jun 23, 2014 ]
2 answers
A
Hello, I would like to know how you distinguish this product is not the problem?? The new product has a sticker marked above is not a July 2008 production?? Thank you to disturb you!
[ Meng-chang  Jun 25, 2014 ]
A
We've confirmed that the HD750/1 amps currently in stock are not part of this recall from JL Audio. For anyone who bought an HD750/1 amp after July 2008, please check with JL Audio to see if your amp needs to be sent back for repair.
[ Jeff  Jun 23, 2014 ]  Staff
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