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JL Audio HD Series HD750/1

Mono subwoofer amplifier — 750 watts RMS x 1

23 Reviews | 4 questions - 9 answers


Our take on the JL Audio HD Series HD750/1

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.

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

Awesome amp really pushes a jl w6v3 always been a big Jl audio guy this amp really s the best one I have had by far great amp

Richard, Gaithersburg, MD

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

JL Audio HD Series HD750/1 Reviews

Average Customer Review(s):

(23 Reviews)

Jl Hd 750 on 3 JL 10's

Jay from Atlanta Georgia on 10/7/2017

Crutchfield Customer Review (What's this?)

i have been wanting to get the hd series amp for a while so i saved my money and got it im running 3 jl audio 10's on it and wow it sounds amazing well worth the money jl audio cost more but you get what you pay its great have been doing business with crutchfield for years they are great better than buying off the internet or in store they give you 60 days to try out products and you can return them if they are not what your looking for and get something else best place to buy electronics thank you all

Pros: great sound quaility small amp that you can mount almost anywhere and its 1.5 ohm stable


Awesome amp

Richard from Gaithersburg, MD on 8/29/2017

Crutchfield Customer Review (What's this?)

Awesome amp really pushes a jl w6v3 always been a big Jl audio guy this amp really s the best one I have had by far great amp

Pros: Small size easy adjustments lots of power

Cons: None!

JL Audio HD Series HD750/1

Anonymous from Gastonia, NC on 7/2/2017

Crutchfield Customer Review (What's this?)

Great little amp that packs a punch. Goes great with the stealthbox that I purchased



JL Audio HD Series HD750/1

Milan from Albany,ga on 5/17/2017

It was easy to fit, looks great and sounds simply amazing

Pros: Small size Great sound Reliable Etc

Cons: Price is steep but worth it.

JL Audio HD Series HD750/1

Anonymous from Frisco, TX on 4/16/2017

Crutchfield Customer Review (What's this?)

Awesome amp!! Hits really hard with 2 10" Boston subs in our boat ! Way more power than the sound stream it replaced



JL Audio HD Series HD750/1

Art from Romeo, Mi. on 4/6/2017

Crutchfield Customer Review (What's this?)

Great amp powers my 2 10TW3 real nice



JL Audio HD Series HD750/1

Anonymous from Waldorf, MD on 3/13/2017

Crutchfield Customer Review (What's this?)

The amp works just as described. It is pushing my JL Stealthbox and it sounds amazing.



Great amp!

Shiva from Royersford, PA on 7/24/2016

Crutchfield Customer Review (What's this?)

Got this to power two JL Audio TW3 10 D4 subs. Let me tell you. This can really push those subs nicely. The audio is super crisp and clear.

Pros: Awesome power and clarity.

Cons: None

HD750/1 drives my Stealthbox

Winston from Plano, TX on 6/6/2016

Crutchfield Customer Review (What's this?)

Drives my JL Audio Stealthbox with no problem. Loud and crisp with proper gain level tuning.




Bd10 from Buford, GA on 5/9/2016

Crutchfield Customer Review (What's this?)

JL audio is crisp and clear. Sounds like I'm at a concert.




Adrian C from Fort Morgan, CO on 10/21/2015

Crutchfield Customer Review (What's this?)

Have this amp powering my 12w7-AE. This thing pounds. Has a very small footprint. It was able to fit under neath my rear captain chairs in my 2007 tahoe so it is hidden very well. Very well worth the money.

Pros: Everything.

Cons: None

Crutchfield service outshines great amp!

Jarad from Panama City on 4/1/2015

Crutchfield Customer Review (What's this?)

JL is a brand for the listener's listener. If you get a new amp/sub setup and the excitement is eclipsed the need to improve it. Or, you always find a nagging clarity or punch deficite, then this is an amp (and product line) to consider. You will spend more money with JL, but you will get more production as well. It's always more expensive to go cheap and then end up biting it than it is to just get it in the first place. Again... Depending on your ear. I was weary of the new HD technology as the raw power of the slash series mono blocks has been my standard for power for a little no time now. The 750/1 delivers in spaydes. It's a perfect marriage with my 10w7 and delivers clean and strong. I had a very rare malfunction issue and was concerned as I called customer service because a lot of retailers will get out of returns once you install the unit. The gentleman on the phone was extremely helpful, talked me through a couple of test scenarios, agreed there was a malfunction and imeadiately sent out a replacement and return shipping labels! I have never seen anything malfunction with JL, so I don't hold this against them, but the benefits of buying through Crutchfield boom louder than my sub!

Pros: Small, lightweight, strong power handling, push-plug connectors in the rear for a clean finish.

Cons: Hard to take the push-plug connectors out if you want to adjust anything.


Rocky from Kalamazoo, MI on 7/18/2014

Crutchfield Customer Review (What's this?)

Sweet, clean power!!! Pushing a J L Audio 10" AE sealed box sub. I hope it does not blow out the glass in my hatchback. P.S. Performs much better if you use 2 guage power & ground. J L suggests min 4 guage, but the power plugs will accept up too 2 guage. The meter does not lie. This puppy loves power, don't starve it.

Pros: Wonderful, size is great, purchased stacking deck and it helped me save some room in my hatshback trunk


VERY nice Amp

Matt from Milwaukee, WI on 1/1/2014

Crutchfield Customer Review (What's this?)

WOW! I'm driving one 10'' JL W3v3 with this amp and it sounds amazing. Its small size made it easy to tuck under the seat and being so efficient, it barley gets warm. Using the optional wired remote is very handy, as my head unit does not have a quick access to sub level control. You can just feel the quality in this unit when you turn and switch the controls. Smooth dials and solid "clicks" from the switches.

Pros: Sounds amazing, Very fine tune able, Efficient, Optional wired remote, Adjustment controls on the front and power/speaker inputs in the back make for a clean install look. High quality!

Cons: None

JL Audio HD Series HD750/1

Anonymous from fl on 12/16/2013

Crutchfield Customer Review (What's this?)

Pushes 3 10w3's with no problems. I am completely happy



A strong workhorse

Jeff the golfer from Metro Detroit on 5/22/2013

I purchased this amp after my other one was on it's last leg after 12 years of service. The reason I purchased JL Audio because the 10 inch W-7 I purchased 2 years prior. The JL Audio products really impressed me. This amp was physically smaller and wattage wise was less but this thing had no problem pushing that beast of a sub. Now I downsized my sub (long story) and went with the JL Audio CP108LG W-7V3 (8in. in a ported enclosure). After talking to the technicians I properly calibrated this monster amp for the smaller subwoofer. Please follow the manual on properly setting this amp with whatever subwoofer you may own. If you don't know, ask someone with experience with the JL Audio product experience.

Pros: physically smaller (more flexible on installs) and power

Cons: NONE

Fantastic Product - Purchased at a shop but wanted to leave an online

Patrick from Dallas on 12/7/2012

I just purchased this amp to power my 12'' JL W7AE3. I was previously using a Kicker KX1200.1 @ 750RMS with 3 Ohms. The Kicker was just not doing justice to my W7. The Kicker could power it and was LOUD but you could tell there was not complete clarity in the sound. The moment I turned the system on I was listening to the same song I have heard everyday for the past 6 months, and I was hearing notes that the Kicker could just not reproduce while producing the low bass notes. This thing hits WAY harder than the Kicker did. If you have a JL sub do it the service of getting the JL amp to power it, you won't be disappointed. If you are looking for a good amp that will provide an excellent signal go with this JL.

Pros: Great Signal Clarity

Cons: Haven't found one yet

Alpine type r 15 dvc 4 ohm

alpinejl from marysville wa on 12/2/2011

This product is amazing. Well worth the money to me, i have it hooked up to my 15" alpine type r dvc 4 ohm sub. This combo is just beautiful, the sound quality is crystal clear. my favorite feature of this amp is how much power it draws on my system. Having a small car like i do i need all the power i can get. With this amp it draws so much less power than any other amp i have owned. I am able to run it on just battery power alone for a good 30 mins. Which is just amazing to me since i was only able to run my old amp for 5 minutes on my battery, and it was less than half of the power of this. It is so compact that you would be able to stick it under your seat no problem. I did a ton of research on this amp before i bought it and had trouble finding real reviews. So here is mine, i love my 750. I plan on buying another so i can stack it. Not yet though, one 15 is enough for my corolla:)

Pros: small, draws less power than class a/b amp, nice design, cool features, great sound quality.

Cons: i wish the detachable wire plugs were a bit easier to remove when needed. maybe just a little button to release it. Instead you have to wiggle it out pretty agressively. But that is the only con that i know of

Went from a 1000/1 to a HD 750/1!!!

Anonymous from Milwaukee on 8/1/2011

I just upgraded my old JL Audio amps that was the 1000/1 to power 1 12w7 and a 300/4 to power 2 pairs of 6 1/2 Infinity 3 way speakers, now I have a HD 750/1 powering my 12w7 and the 600/4 powering the 4 Infinities anSlash amps do!!!



JL 750/1

JohnS from Columbus, GA on 7/18/2011

Crutchfield Customer Review (What's this?)

I currently have this pushing one 10" JL W7 and its astonishing. My only gripe with this amp was that it lasted 10 months before getting the alternating red/green light. Had my car checked out to be sure it wasnt a voltage or wiring issue. So if those two things check through it meant the amp died and needed to be serviced. At least JL offers an outstanding warranty. My only concern now is the replacment I get goes boom after the warranty is gone. Wish me luck!



JL Audio 750/1

tha lars from Longview,WA on 6/4/2010

You will NOT be disappointed with this!!! . I currently have this amp hooked up to a set of JL Audio 12W3V3's subs in a ported box and the sound is complete BLISS!! Not to mention the absolute power this thing produces is amazing!! It seriously pounds out a full 750 RMS as JL promises unlike cheaper stuff that massively over-rates their specifications!! I drive an 03 Mitsubishi Galant with everything stock incliding the alternator(85 amp output). The only thing I upgraded was the battery to a higher reserve capacity so that this power-house of an amp could run with ease. My lights dim just a little a night,..and I do mean just a little!! If you plan to install yourself, just make sure that you run 4 gauge power and ground wire...It is very IMPORTANT!! Don't go buy some cheap amp kit to hook up to a powerful amp like this!! Besides, this amp will mute the sub outputs to protect itself if the power requirements are not met. Also, it wouldn't hurt to add an a additional 4 guage ground wire from your battery to the chassis under the hood. Then you will be all set to enjoy...TRUST ME!!



Clean power and lots of it for the size...

Beau from Nashville, TN on 10/2/2009

Crutchfield Customer Review (What's this?)

This JL Audio HD amplifier has enough power to play most subwoofer combos/ impedances and sound great in the process... This amp also is a great choice when you want to keep it out of sight from people walking by your vehicle- its slim size allows you to mount it easily under most seats or in places where other amps could overheat... But do not let its size fool you, I've owned other amps that claimed to produce 750W RMS but this JL product does (at least) that very honestly... However if you are looking for raw, forceful power to drive power hungry subwoofers at 2 ohms, you should really look at the JL AUDIO 500/1v2 OR 1000/1v2 amplifiers Crutchfield sells online... They are more geared for prolonged or competiton use with SPL subs... This HD amp is a great choice however if sound quality is more up your alley, because its quality really IS hard to match. Also, you can never go wrong buying the Remote bass level knob... it's something you want to purchase with any large amp really- great convenience and control.



Amazing Amp

Sean from Richmond, VA on 3/11/2009

I have this pushing a 10w7 in a sealed box w/ a LP x-over point of 80hz at 12db/octave w/ the infrasonic filter off (suggested infrasonic filter setting in the w7 manual for a sealed box) i know i've yet to fully tap into the potential of the hd750/10w7 combo but so far i'm very impressed, now i need to upgrade my front stage w/ either alpine typeX pro or polk sr6500.




Hands-on research

Product Research



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-14.5 V). This allows the JL Audio HD amplifier's the 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.


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 removal 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.


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.

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.

Staff Reviews

Product reviews from the Crutchfield Labs

Harold Jones, winner of Virginia's IASCA Sound Quality Challenge, was kind enough to drop by Crutchfield headquarters to show off his impressive ride.

What are the Labs?
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Because it's the best for its size . And the amp will push it nicely!!! [ K  Mar 31, 2017 ]
jl name [ K  Mar 21, 2017 ]
Drives my JBL W12GTi MKii subwoofer beautifully. No problems whatsoever and the wiring flexibility is wonderful! [ M  Feb 08, 2017 ]
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 ]
i havent try it but i hope is worth the money [ CARLOS  Sep 24, 2016 ]
Reviews and JL audio reputation of quality. [ Shiva  Jul 09, 2016 ]
Reviews and I ordered a JL subwoofer. [ Winston  May 28, 2016 ]
Best audio equipment out there. [ Brad  Apr 06, 2016 ]
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 ]
Because it was recommended as a good fit for the stealthbox [ Shannon  Jan 01, 2016 ]

4 questions already asked

I'm running mine on a 12W7 H0 box. It slams. Just make sure it will fit in your car. ?? [ LANCE  Apr 05, 2017 ]
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 ]
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 ]
You will be very impressed. Clean power. [ Jarad  Mar 30, 2016 ]
Definitely. [ Ankur  Mar 30, 2016 ]
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 ]
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: Or try our online support center: [ Krissy  Aug 05, 2015 ]  Staff
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 ]
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