JL Audio HD600/4 Class D 600 Watt 4 Channel Full Dash Range Car Amplifier

by JL Audio

Product Details

• Shipping Weight: 12 pounds (View shipping rates and policies)
• ASIN: B001OEYFKM
• Item model number: HD600/4
• Average Customer Review: 4.0 out of 5 stars  See all reviews (3 customer reviews)
• Amazon Best Sellers Rank: #16,839 in Electronics (See Top 100 in Electronics)

Product Description

"Small" is not the real story here. Making an amplifier small is great, of course... but not if power and sound quality are sacrificed. This is why our engineering team focused on achieving world-class fidelity first, and then on making our HD amplifiers amazingly powerful, efficient and small. These efforts led to a remarkable switching amplifier technology called Single Cycle ControlTM, which allows all of these goals to be achieved. This exclusive core amplifier technology is mated to our regulated, intelligent power supply (R.I.P.S.), advanced thermal management systems and a full complement of studio-grade processing features to put the all-new HD amplifiers in a performance class all their own. We invite you to sonically compare the HD amplifiers to any amplifier, at any price... We think you will quickly discover that all the old amplifier compromises have suddenly vanished. Patented Single Cycle Control switching technology corrects output in each and every switching cycle (over 400,000 times per second) for pristine power delivery. Studio-Grade Signal Processing. A full complement of expertly executed signal processing features make HD's flexible in application and a joy to tune in a variety of system designs. Advanced Rollback Protection and RealSink. Real, cast aluminum finned heat sinks and our "never-quit" rollback circuitry eliminate annoying thermal shutdown events. Remote Level Control (HD-RLC). With the addition of an HD-RLC you can control the overall level of the amplifier (or amplifiers) from the front of your vehicle. R.I.P.S. System. The remarkable R.I.P.S. System ensures consistent power delivery over a wide range of battery voltages and load impedances. Differential-Balanced Inputs Greatly reduce noise and provide compatibility with a wide range of sources, including most OEM systems. HD Amplifiers have two mounting options to ease in installation and can also be stacked with an optional stacking kit.

Customer Reviews

Most Helpful Customer Reviews

8 of 8 people found the following review helpful:

2.0 out of 5 stars Better than my high expectations, until later...., October 13, 2010

By 

Mark B (California) - See all my reviews

This review is from: JL Audio HD600/4 Class D 600 Watt 4 Channel Full Dash Range Car Amplifier (Electronics)

After paying this much for an amp, my expectations were quite high.
The amp exceeded every expectation I had.
First- The build quality is absolutely top rate. The removable connectors fit very tightly. The removable control panel has a positive lock so it can not vibrate or make noise. The RCA inputs are of excellent quality. A nice touch is that you can mount the amp on either side. This was nice because in my installation it worked better to have the back side facing up.
The next thing I observed after the installation was how low the noise floor really was. I could not hear it. The noise I could barely hear was actually coming from the source deck. I measured the noise floor at -109 Db with an Audio Precision Portable 1. That is the best I have ever measured on a car audio device. The ground isolated RCA inputs are a nice touch. No ground loops are possible.
In my installation I am using it to power a set of JBL 660GTi speakers in bi-amp mode.
I was worried that the anti-clipping circuitry or being a full digital amp would color the sound. I had nothing to worry about. The sound is very smooth and the transients are sharp and clear, but not harsh. When driven hard, I could detect the anti-clipping circuitry activating, but it was not too objectionable.
I was surprised that the amp is quite efficient. The fuse size is only 50A, for a 600 watt RMS amp.
I am very satisfied with this purchase.

*** UPDATE ***

So it worked really well for about 14 months. I first thought I was hearing something, every once in a great while. I could not figure it out. The problem has gotten much worse. Now channel one of the 4 channels cuts out and pops about one a second when the volume is low. The power light turns orange when popping. I am replacing it with an Alpine.

2 of 2 people found the following review helpful:

5.0 out of 5 stars Outstanding amp!, June 1, 2011

By 

mike - bel air, md - See all my reviews

Amazon Verified Purchase

This review is from: JL Audio HD600/4 Class D 600 Watt 4 Channel Full Dash Range Car Amplifier (Electronics)

What can I say, this amp is outstanding, which is what I was hoping for...this is the first time I've purchased JLAudio equipment, and it's living up to it's reputation. Slim design, lightweight, and runs quite cool...

The plug-in connectors for the power/speaker connections are just an awesome idea, well done JL. Being able to mate the power/gnd/speaker connections to the connectors by themselves (without having to wrestle with seeing around the amplifier body when normally doing this) makes installation so much easier. You can easily see what you are doing when clamping down each wire into the connector, and even better, this allows you to wait until the very end before actually mounting your amp. Connectors easily mate into their respective spots on the back of the amp, and fit VERY snug. (you will need to put some good muscle into them when you want to remove them!)...

Also, besides the ease of installation, this also gives the extra benefit of being able to easily/quickly remove your amp in a hurry, for whatever reason (it's blocking access to your spare tire, or whatever!!)

Sound quality and power is outstanding, no complains whatsoever. I hear absolutely no noise from this amp, and it's driving my Boston Acoustic ProSE 60s (rear deck), along with a Polk Audio DXI112 12" sub perfectly!

1 of 1 people found the following review helpful:

5.0 out of 5 stars JL Audio HD 600/4, December 2, 2011

By 

Stephanie Singleton - See all my reviews
(REAL NAME)   

Amazon Verified Purchase

This review is from: JL Audio HD600/4 Class D 600 Watt 4 Channel Full Dash Range Car Amplifier (Electronics)

This was purchased to compliment my 750/1 amp. If you are need of a well rounded system with plenty of ceiling, this amp is great for that application. I had the XD400/4 before and there is NO comparing the two. Get this, get this NOW lol...