This probably makes the JL Audio expensive because of their technologies. Anyways, JBL, Kicker, Rockford Fosgate, Alpine, Pioneer, MTX, Bazooka, Sony Xplod, DB Drive e.t.c. have their own "stuff". This is just few main things about high quality subs. That's why best is not best. The loudest sound system was a grey 1990 XL Ford Van, in McAllen, TX. Garland Mobile Auto Mechanic

None . .

Nothing about those 2 tires is in any way, shape or form similar. The X-One is even worse, it''s hard as a brick. It is a cavalier compared to the Vette. There is absolutle zero relation between these tires and the XGT-Z. It is an ultra high performance tire. It''s OEM on the Viper for corn''s sake. Don''t be mislead by these other people. RPM Parker Towing & Recovery

None . .

CUL! power full, Looks good, and very CLEAN!!!!:)

Da fans are little noisy ;(

this amp is running my abc60002 component in my Supra. For 2x35 watts @ 4ohms, I am amazed!!!!!!! This amp is best used for your speaker or component

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NONE!!!!!!!!!!!! ;'')

1/2 ohm stable. Wide variety of ways to hook up subs without having to worry about overheating the amp.

The high price for 240 x 1 into 1 ohm mono bridged.

I would recommend it to run a bunch of normal car speakers. It's pretty good on my kicker impulses but they got pretty old fast.

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Crunch amp. This one is louder and better made for my subs.

1 and 2 ohm stable...pushes 2 10's with ease...blue lights, bounce meters, and dual fans give it class, (not to mention the chrome and gold finish!) I am satisfied!

I could have found a number of amps that push more than 140x2 watts at 1 ohm for less than $250, but, you cannot beat the looks!

I have been having the amp on 2 Rockford Fosgate 10's for about 3 months. So far, I am pleased. I hope I get my money's worth in the long run.

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Kenwood KAC-728S: Not near enough power to handle my speakers.