Installed my amp and sub and was working fine for about 20 mins. Then I started to smell the burning... Got out and the face of the sub was too hot to touch as was the amp. Did i wire the sub wrong or do you think its faulty? I've installed many systems and never had this problem.

The amp I was using is just a piece of crap that I had laying around. It's a Crunch GPV 1000.2. Since its not 2ohm stable I had the one sub just on one channel. The sub since dvc was wired one side positive to the other side positive. Same for the negative, one side to the other side. Then the negative speaker wire from the amp to the negative on the left voice coil. Then the positive to the right positive voice coil. Would having the input from the amp not on the same voice coil cause this?

Oh ya the box was also heavily stuffed with poly.



The crescent shape is the melty part.

 

Is this what you are describing? http://a248.e.akamai.net/pix.crutchf...4-ohm_mono.jpg
If so then that's fine the way it's wired. Check your amp's output voltage to the sub. Make sure the voltage is set correctly at the amp for the sub being 2 ohms.

 

That's exactly how I wired it. The amp is not 2 ohm stable when bridged, it will go into protect mode. The amp does claim to be 2ohm stable in stereo so that is why I just used one channel. Could that be a problem just using one channel in stereo?

 

The amp can't overheat the sub except by supplying too much power. If the signal is clipped
(turning the amp up until it distorts), it effectively increases the average current across the
voice coil (square wave instead of a sine wave) versus an undistorted signal, which could
heat it up, but I suspect the large amount of polyfill acted as heat insulation preventing
the sub from dissipating excess heat. It might be worth checking the impedence of the sub
as wired with an ohmmeter - if it's substantially below 2 ohms there may be some kind of short
in the speaker.

 

There was no distortion, I am pretty picky about that. The manual for the sub requested heavy polyfill. Guess I have to go find my meter. I want to replace it but Im hesistant now. Dangit

 

I was just theorizing about the polyfill, and of course your idea of "heavy polyfill" and mine
may be totally different. How big is the box (especially compared to MB's recommendatiom) and
how thoroughly stuffed is it?

 

Box is a little larger than recommended. Like .6 compared to .4.


I could def stuff a lot more poly in there if I wanted. Like, its not forced in the box, its just placed in the box.

 

Nothing you've said sounds like you've done anything wrong to me.

 

amp was clipping! or signal feed to amp was poor and it amped a clipped signal...

I am seeing this more and more, people using recordings that a of poor quality, clipped.

Most manufactures do not warranty from a burnt Voice Coil..... that is the users responsibility. over powering, wrong box, or clipped signal..... box and fiber fill was not the problem.....

 

^ this. You smoked your voice coil by either (a) incorrectly setting your gain or (b) cranking it too high without setting the low pass. Luckily those mb quart subs (as well as anything else that comes out of maxxxsonics aren't quality anyways and nothing to lose sleep about. Set your gain with a DMM and a clean test tone next time. Let me know if you need help.