sub stop, but amp work fine

Hi, i got a 1998 Chevrolet cavalier. My System Amp: Pioneer GM-7400M 400 Watt RMS at 2 Ohms Sub: Pioneer TS-W257D4 10" 350 Watt RMS at 2 Ohms Headunit: Sony Xplod CDX-GT220 Sub wired in 2 Ohms Eq Custom Low -6 Mid +0 Hi +6 Sub +9 The problem is.. when i put a good bass song and i put the volume more than 28 (Max is 34) the sub stop and come back but the amp still doesnt stop or flash . The light on the amp always blue and never change.. And the car is running when i do that.. What the problem ? Lack of power???

Could be many things including a defective woofer, but the most common issues causing this are 1) amp gain too high, 2) woofer impedance too low, 3) power issues including alternator overload or bad ground.  I suggest starting by reading and following the "How to set your gain" thread.Support the12volt.com

Well, i alternator have 1 year and my battery have 3 days , but i think its the ground because my ground its the antena.. i have screwed it on the antena screw

sublinux wrote: Well, i alternator have 1 year and my battery have 3 days , but i think its the ground because my ground its the antena.. i have screwed it on the antena screw

Read the "What is a proper ground?" sticky.

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Ground now good . Direct on frame.. Alternator and battery are new, woofer and amp have only 2 days

frozenuts wrote: I would do what the young man said in the first reply. Have you smelled anything cooking yet?

Also, unless you were hunting it, you have the cavalier, you do not got it...

all bad things come in moderation. do not shop at fry's. Get your own log in Omar.