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JL Audio HD600/4

600W RMS HD Series Class-D 4-Channel Amplifier

JL Audio
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• 150 watts x 4 channel (rated power from 1.5 to 4 ohms)
• Bridged: 300 watts x 2 channel (rated power from 4 to 8 ohms)
• Total RMS Power: 600 watts
• Class D 1.5 ohms Stable 4-Channel Amplifier

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JL Audio HD600/4

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Product Highlights


• 150 watts x 4 channel (rated power from 1.5 to 4 ohms)
• Bridged: 300 watts x 2 channel (rated power from 4 to 8 ohms)
• Total RMS Power: 600 watts
• Class D 1.5 ohms Stable 4-Channel Amplifier

Description


JL Audio brand icon

Authorized dealer

JL Audio HD 4-Channel Class D Full-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 set 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 HD600/4 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 (150 watts x 4 or 300 watts x 2 [bridged]) 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 HD600/4 gives you the freedom to use a variety of speaker 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 4-Channel Amplifier
  • RMS Power Rating:
    • 4 ohms: 150 watts x 4 channel
    • 3 ohms: 150 watts x 4 channel
    • 2 ohms: 150 watts x 4 channel
    • 1.5 ohm: 150 watts x 4 channel
    • Bridged: 300 watts x 2 channel @ 4 to 8 ohms
  • Total power output: 600 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 - 30000 Hz
  • Total Harmonic Distortion (THD): <0.03%
  • Signal to Noise Ratio: >110 dB
  • Variable high-pass filter: 50 - 500 Hz
  • Variable low-pass filter: 50 - 500 Hz
  • Fuse Rating: 50A
  • 4 AWG gauge amplifier wiring kit is recommended for installation
  • Dimensions: 10-13/16" L x 8-7/8" W x 2" H
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty
  • MFR #: HD600/4

JL Audio HD600/4 owner’s manual

Specifications & Details


Key Features
Amplifier Key Features
Speaker Level Inputs
Power Specifications - Full Range Channels
RMS Power @ 4 ohms
150 watts x 4 channel
RMS Power @ 3 ohms
150 watts x 4 channel
RMS Power @ 2 ohms
150 watts x 4 channel
RMS Power @ 1.5 ohm
150 watts x 4 channel
Bridged RMS Power
300 watts x 2 channel
Amplifier Specifications
Series
HD Series
Amplifier Class
D
Number of Channels
4-Channel
Total RMS Power Output
600 watts
Maximum Input Gauge Size
4 AWG
Minimum Impedance Unbridged
1.5 ohms
Minimum Impedance Bridged
4 ohms
Frequency Response
6 - 30000 Hz
THD at Rated RMS Power
<0.03%
Speaker Level Inputs
Yes
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
50A x 1 
Total Fuse Rating
50
Strappable
No
Sonic Certified Amplifier
Yes
Amp Bluetooth Connectivity
No
Hi-Res Certified
No
Low-Level Input Sensitivity
200mV - 2 volts
High-Level Input Sensitivity
800mV - 8 volts
What is in the box?
Paperwork
User manual
Warranty/Registration card
WITB: Amplifiers
Amplifier
Mounting screws (4)
Allen wrenches (2)
Warranty and Return Policy
Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

HD600/4

Weight:

8.27lbs

Internal SKU:

hd6004

Internal Product ID:

15358

Product and How-to Videos


  • JL Audio HX300/1 & MHX300/1 Car and Marine Amplifiers | Product Overview
  • How To Install an Amplifier: Car Amplifier Basics Part 2

Customer Ratings & Reviews



5 star
93%
4 star
0%
3 star
7%
2 star
0%
1 star
0%



Durability
4.9
Value
4.8
Features
5
Design
5
Usability
5

Customer Reviews

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Superlative Amp Superlative Sound!

I decided to get serious with my new car and the audio system and did a hell of a lot of research and it certainly paid off. This is the best amp I have ever had, and may I say I've been a DJ for 26 years and this JL HD600/4 amp can handle anything! Combined with JL C5650 Audio speakers and a 12" sub, the sound for me is just superlative with so much headroom and zero distortion. Thanks also to Sonic Electronix for such a great deal. Couldn't believe it until they arrived in my hands in Australia, but was so happy when it was the real deal. Highly recommended product and seller.

By Tonydj on October 29, 2010

50

found this helpful.

JL Audio HD600/4 clean powerful not affect my electrical system in my truck

Clean and very powerful amp don't let its small size fool you this thing rocks! Very good in terms of power and clarity and to top it off not adversely affecting my 2011 Toyota's stock electrical system, no dimming lights, monitor voltage and not have any issues, of note also running JL Audio HD1200/1 Pushing 4 TW5-3 13" subs in a sealed box, sounds powerful and clean with the sound stage of the JBL 660GTi speakers sound amazing!

By Tom on May 6, 2014

47

found this helpful.

Rock solid

This is by far the best amp I had a PDX-150 and a kicker zx650 and both would shut down from overheating after 25 min but the jl keep playing without even getting hot

By JJella on November 10, 2010

46

found this helpful.

BEST AMP ON THE MARKET

this amp is one of the best amps ever made in my opinion. great sound alot of power small size. doenst get hot. stays warm. ive used in a 3 way mode with sub and sounds great also as a 4 channel for my door speakers and it gets real loud and yet clear AWESOME JL AUDIO KEEP UP THE WORK! AND SONIC IS THE BEST PLACE TO BUY CAR AUDIO!!

By Hector on February 6, 2013

44

found this helpful.

Sonic Electronix is the Best!!

I have had many purchases through SonicElectronix and every time it has been a pleasure to do business with them. They have great prices, speedy delivery and their customer service is superb. My latest purchase was the JL Audio HD600/4 amp and it is a quality item. It is powerful and the audio clean, crisp and detailed. This amp will not let you down.

By Cam.. on June 2, 2010

41

found this helpful.

the best

powerfull amp!!!!!!!! 5 years after still the best amp highly recommended!

By fidel on December 5, 2014

39

found this helpful.

Well worth it.

A little pricey but these are the real deal. I installed these (600/4 and a 750/1) with no worries.

By Terrence on May 31, 2011

39

found this helpful.

Robert

Great sound, worth the extra cost. Recommend if you want great sound purchase.

By Rob on June 9, 2012

37

found this helpful.

Great amp!

I dont personally run this amp, but a close friend of mine does whom ive helped install/tune his system. The size of the amp is pretty small, so you have more options for amp placement. This is a powerhouse to, and sounds great. The only complaint, is that it uses a connecter for the speaker terminals instead of wiring directly to the amp (this is me personally, its a lot easier for isntall purposes and you dont run the risk of stripping out the phillips screws on most amps). Overall, great amp, just a little pricey.

By matthew on November 12, 2011

38

found this helpful.

Sound is lifeless.. sorry

For an expensive 4 channel car amplifier you would think the sound would take your breath away if connected to decent hi-end quality speakers. For the JL HD600/4, I feel this is not the case at all. Like the other reviewer said I was left scratching my head trying to figure out why the sound was just mediocre - just meh. Any lesser quality A/B amp would definately outshine the JL HD because I feel it lacks fullness and instrument realism. I had tuned and played with crossover points, db levels, and equalized my head deck (80prs) for hours trying to figure out why my music wasn't producing the results I wanted. It was like everything was flat. There was no depth to live instruments or fullness- something was lacking. I eventually gave up with the JL HD series and installed and another amp.. immediately the music came to life but was still lacking some depth and realism ( had some serious kick in the low end - but the highs were a bit fabricated). I then took the chance and went with the Kenwood Excelon XR400-4 ( yes a Kenwood - I thought i would never say that) and HOLY COW.. like night and day. The Kenwood outperformed the JL HD600/4 in every aspect in terms of depth, fullness, realism, dynamic, punchy, and crisp! The Kenwood also had NO NOISE! NONE.. something the JL HD had especially at higher volumes. Save your money and put it towards an Excelon if you are looking for a quality Class D Amplifer that sounds waay better & less $$!!

By Anonymous on February 12, 2019 Checkmark Icon Verified purchase

28

found this helpful.

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