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Finally tracked down a thermal issue. But what could it be?


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I've been having this odd problem where no matter what have hooked up, there is this disproportionate amount of heat dumped into the coil.

If I use my mixing board as a source, I can free air one of my 12s and the coil gets stinky in about 3-5 seconds at any volume. This isn't a bunch of power either. 400 watts. There is nothing obvious happening - no strange sounds, sub is moving equally in either direction, and my multi meter isn't picking up any sort of DC offset

If I remove the mixing board and plug straight into my crossover (which then goes to the amp) I get results like what I would expect off of 400 watts. Coil stays cool enough to touch even after several minutes.

I've tried playing a square wave straight into the amp, just to see if some sort of clipping may be the culprit and I can't seem to put much heat into the coil. It remains cool to the touch.

The only conclusion I can draw is that there's something funky with the mixing board. But now I'm curious what in the world could cause this to happen?

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I had a H/U that would randomly start clipping the signal to the sub, so you could replay a song and all of a sudden you begin to smell the coil from the clipping it was doing. i wound up replacing the h/u and have not had a problem since so i would at the least try another mixer to see if it is indeed that one causing the problems.

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Yeah that's the piece of broken equipment... But I'm curious how it could dump that much heat into a coil without something obviously looking/sounding wrong. I mean... These subs were on a wall socket for 5 minutes and showed no signs of failure

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I had a H/U that would randomly start clipping the signal to the sub, so you could replay a song and all of a sudden you begin to smell the coil from the clipping it was doing. i wound up replacing the h/u and have not had a problem since so i would at the least try another mixer to see if it is indeed that one causing the problems.

What headunit was that?

Also... That's freakin weird mr snow.

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I think everyone is forgeting snow posted in the pro audio section lol

what desk is it pro? Ill have a look at the shimetics and see if there is anything that could possibly cause it,

are the desk/crossover/amp all plugged into the same power outlet?

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Good rule of thump is go by what fuse size is being used in these amps. The higher the more amperage it pulls, this is what I look at.

I'll stick a 300 amp fuse in a potato and sell it to you for $2k.

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