JL Audio HD1200/1

1200W RMS HD Series Class-D Monoblock Amplifier

JL Audio
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• 1200 watts x 1 channel @ from 1.5 to 4 ohms
• Total RMS Power: 1200 watts
• Class D 1.5 ohms Stable Monoblock Amplifier

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Product Highlights

• 1200 watts x 1 channel @ from 1.5 to 4 ohms
• Total RMS Power: 1200 watts
• Class D 1.5 ohms Stable Monoblock Amplifier


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JL Audio HD Monoblock Class D Wide-Range Amplifier

JL Audio's Flagship Series of amplifiers offer unmatched performance from an ultra-compact chassis. These Class D amplifiers require less power, generate minimal heat and take up far less space than the common amplifier design. HD Series amplifiers reproduce your music with outstanding accuracy, providing high-fidelity sound even under the most demanding conditions, thanks to a number of JL Audio exclusive technologies. Single Cycle Control (U.S. Patent #6,084,450), R.I.P.S System and Advanced Rollback Protection are just a few of the technologies that sets the HD Series apart from the rest of the market, all designed to deliver top-flight audio performance. In addition, behind every HD's removable security cover, you will find studio-grade signal processing with fully variable crossover filters to properly tune in your setup and put all the technology under the hood to good use.

Also included are JL Audio's noise-killing, highly flexible differential-balanced inputs with remote level control capabilities via the HD-RLC remote level control (sold separately).

Advanced Rollback Protection

JL Audio's signature Advanced Thermal Rollback protection system eliminates annoying thermal shutdown events to keep the music playing, even under the most demanding conditions. Should the amplifier reach an unsafe operating temperature, a special circuit rolls back peak power output, without changing gain, until the amplifier cools down to a safe operating temperature. The red "Thermal" LED will light to indicate this condition has been reached. Once the amplifier cools down, the circuit restores full peak power output and the red "Thermal" indicator reverts to its normal state. The operation of Advanced Rollback Protection is inaudible in most cases.

R.I.P.S. System

The HD1200/1 employs JL Audio's exclusive Regulated, Intelligent Power Supply (R.I.P.S.) design. This sophisticated power supply allows the amplifier to produce its optimum power (1200 watts x 1) over a wide range of speaker impedances. Unlike conventional amplifiers that require a specific impedance to produce optimum power, the R.I.P.S.-equipped HD1200/1 gives you the freedom to use a variety of subwoofer configurations without sacrificing power output or sound quality. The operation of the R.I.P.S. circuitry is entirely automatic and adjusts itself every time the amplifier is turned on according to the lowest impedance present at the speaker load.

Product Details:

  • HD Series Class D 1.5 ohms Stable Monoblock Amplifier
  • RMS Power Rating:
    • 4 ohms: 1200 watts x 1 channel
    • 3 ohms: 1200 watts x 1 channel
    • 2 ohms: 1200 watts x 1 channel
    • 1.5 ohm: 1200 watts x 1 channel
  • Total power output: 1200 watts
  • LED Power/Protect Light
  • MOSFET power and output stages
  • Wired bass level remote control with optional JL Audio HD-RLC
  • Speaker-level (high-level) inputs (Requires adapter like the JL Audio XD-CLRAIC2-SW)
  • Protection Circuitry with Status LED
  • Differential-balanced inputs help eliminate noise
  • Advanced Rollback Protection System prevents thermal shut-down
  • Single Cycle Control™ technology to eliminate the excessive signal distortion
  • Optional JL Audio HD Stacking Kit for stacking multiple HD amps together
  • Input sensitivity:
    • Low level: 200mV - 2 volts
    • High level: 800mV - 8 volts
  • Frequency Response: 6 - 8000 Hz
  • Total Harmonic Distortion (THD): <0.03%
  • Signal to Noise Ratio: >110 dB
  • Variable low-pass filter: 50 - 500 Hz
  • Variable high-pass filter: 50 - 500 Hz
  • Fuse Rating: 100A
  • 2 AWG gauge amplifier wiring kit is recommended for installation
  • Dimensions: 10-13/16" L x 8-13/16" W x 2" H
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty
  • MFR #: HD1200/1

Check out the JL Audio HD1200/1 Owner's Manual

Specifications & Details

Key Features
Amplifier Key Features
Speaker Level Inputs
Power Specifications - Subwoofer Channel
RMS Power @ 4 ohms
1200 watts x 1 channel
RMS Power @ 3 ohm
1200 watts x 1 channel
RMS Power @ 2 ohms
1200 watts x 1 channel
RMS Power @ 1.5 ohm
1200 watts x 1 channel
Amplifier Specifications
HD Series
Amplifier Class
Number of Channels
1 - Mono
Total RMS Power Output
1200 watts
Maximum Input Gauge Size
Minimum Impedance Unbridged
1.5 ohms
Minimum Impedance Bridged
Not Bridgeable
Frequency Response
6 - 8000 Hz
THD at Rated RMS Power
Speaker Level Inputs
Preamp Outputs
1 pair
Built-in Crossover
Low-Pass (LP)
High-Pass (HP)
Full (AP)
High-Pass Crossover Frequency
50 - 500 Hz
Low-Pass Crossover Frequency
50 - 500 Hz
Signal-to-Noise Ratio
>110 dB
Remote bass/level controller
Optional (Accessory required and sold separately)
Fuse Rating
100A x 1 
Total Fuse Rating
Sonic Certified Amplifier
Amp Bluetooth Connectivity
Hi-Res Certified
Low-Level Input Sensitivity
200mV - 2 volts
High-Level Input Sensitivity
800mV - 8 volts
What is in the box?
User manual
WITB: Amplifiers
Mounting screws (4)
Adhesive brand badge
Allen wrenches (2)
Warranty and Return Policy
Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider

Item Details


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Customer Ratings & Reviews

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Customer Reviews

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No one does it like jl audio

I have run many systems over the years but none have compared to my current setup the staff at sonic have always led me in the rite direction this system rocks will blow you away crystal clear clean audio with all the bass one could ever want or need Once again thanks sonic

By Steve on January 21, 2014


found this helpful.

jl 1200/1

Great amp make sure you upgrade your electrical alternator and battery uses a lot of power.

By kurt on September 22, 2012


found this helpful.


Bought this amp to run a 12w6v2, and wow, thats all I have to say. well worth the money, and if I want to add a second sub I always can. It will handle them both easy. A bit pricey, but im sure it will be the last sub amp i buy for a long time.

By greg on June 21, 2012


found this helpful.

Bullet proof

I use one of these to power a 13w7 and it gives it every thing it can handle and more. The noise floor is non existent like the amp is silent completely until the music starts. And it barely gets warm even after hours of play on long trips and myself I have never had a shit down or anything. And all I have for electrical is stock 120amp alt 4 Gauge ran back to a 1000 watt capable secondary battery and 1/0 run from that bat to the amp and it’s so efficient I barely have any headlight flicker. I have been banging this amp for 6 years and could not be happier. I wonder how many so called better for cheaper amps have burned up in the 6 years I have had this amp. Yea it’s not cheap but if your serious about your audio like me and you plan to keep the stuff or actually want to get something back out of it if you do sell do yourself a favor and just save a little longer and get the good stuff the first time instead of doing like a lot of noobs and saying well this amp says 1500 Watts at 1ohm I will get that for half price, trust me you ain’t getting what you think. I dare you to compare this amp to any amp under 5k Watts that’s a unregulated amp and I bet this one in the car actually playing music is louder. I myself have a DC 2k and the HD 1200/1 is every bit as loud or louder on less electrical and less cone area on the sub.

By Anonymous on July 25, 2018


found this helpful.

Unreal SQ and SPL

bought two of these bad boys to power 2 12w7AE's in a custom built ported box. however i only hooked up 1 amp to 1 sub.. and being honest it was twice as loud as my previous setup of 1 rockford t2d412 powered by a pdxm12. i cant imagine hooking the other amp and sub it would make me deaf. the sound quality is superb, doesnt need much power it will stay at 1200rms even at 11v and barely get warm. i would recommend this amp to anyone and everyone i know. ive had several different brands over the years and this one is by far the best if you are looking for both SQ and SPL

By sharma on October 2, 2015


found this helpful.

Wicked Amps

Again, I did a lot of research on the amps to pair with my JL Audio C7’s. And these were by far the best. Very well made and with the intelligent power supply, They get nowhere near as hot. I have fans wired into my system which have yet to come on. The sound is amazing, and you hear every level of detail with no distortion. Paired with a my 13W7AE, this thing is a beast!!

By Anonymous on August 4, 2018 Checkmark Icon Verified purchase


found this helpful.

By Donald on October 1, 2022 Checkmark Icon Verified purchase


found this helpful.


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