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.

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!!

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

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.

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

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.

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