Im running a Sony CDX-M630 head unit with a MB Acoustics 600 watt amp pushing 2 older RF punch (more detailed info at This Post). When Im listening to a cd or anything else and the song has a constant bass beat, I`ll get about 10 - 15 seconds of good bass then is gradually quiets. If there is a pause in the bass, say 20 sec or so, when it starts back up the bass is back where it should be for a few hits and goes down again. Ive heard that newer cd players have a sensor that tells if your sending your amp to much power and cuts it so nothing blows up. Is this whats happening?

 

Sounds like your battery is draining. Do your lights dim when this happens?

 

^^^ Nope all lights are good.

 

Is your amp clipping?

 

Dont know what that is moo.

Nevermind, Wikipedia is a god send!! Audio Clipping

I now know what it is but im still not sure if thats whats going on.

 

I guess one way to check if it is a power-related problem is to listen to the same song and at the same volume 1) with the engine on (and maybe keeping it revved at say 2000 rpm), and 2) with the engine off. If the dimming happens sooner with the engine off, then you are probably using too much power, more than the alternator can handle..
You could also use a voltmeter and check if there is any voltage change during the 10-15 seconds before it quiets.

Radu

 

Definately not a issue with your deck... That would be enough to ruin a company's reputation. It sounds like a power supply problem with the amplifier. You may want to recheck your grounding... make sure you have the proper terminators on it and the ground is clean and coated with a anti-corrosion dielectric grease. If everything checks out, you may have a bad amp 02.gif

It kind of sounds like something is heating up and disconnecting internally inside your amplifier.

 

if u can get a hold of a capacitor try it with that, and see if theres any difference. if there isnt bring it back or w/e