Average Reviews:
(More customer reviews)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.
Click Here to see more reviews about: JL HD 600/4
"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 InputsGreatly 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.
