Thermal Compression?

I just picked up some Blaupunkt 6.5 components and in 4 days use i'm already getting some BAD thermal shutdown on the tweets. I had MB Quarts in my Prelude and never had a problem with this... does anyone have recommendations for better speakers? This is driving me nuts. It feels like my ears are going numb when it happens.. gah.

wait, what?

your speakers can't go into temporary thermal shutdown, just by the way that they work it's not physically possible

I've always been under the understanding that a high frequency driver (most notorious for thermal failure) can heat up the voice coil, reducing efficiency (temporarily warp the voice coil) and go into failure until it has a chance to cool at which point it will kick back in. This seems to be the case with my blaupunkt tweets.
I've been reading on it and discovered amp clipping is the most common cause for thermal failure. It's possible I could be clipping my amp, even though I didn't adjust the gain since moving it from my car with the MB Quarts to the car with the Blaupunkts, I DID switch it from four channel mode to two channel mode. I don't know if that would cause it to be more sensitive to input or not. I need to run an analyzer on it and check signal levels throughout the system. I just turned down the gains (which weren't maxed, by the way) about 2 hour marks, I'll see if that makes a difference.

sr20 ... the speakers don't go into thermal shutdown per se - when they get hot, the drop resistance and some of the passive crossovers DO have a thermal shutdown. Or the lowered resistance could also cause the amp to do that if they are being actively crossed. Speakers like the Boston acoustics tweets with the neodymium magnets are very susceptible to this.

sr20 ... the speakers don't go into thermal shutdown per se - when they get hot, the drop resistance and some of the passive crossovers DO have a thermal shutdown. Or the lowered resistance could also cause the amp to do that if they are being actively crossed. Speakers like the Boston acoustics tweets with the neodymium magnets are very susceptible to this.


hm, well I guess I'm the asshole ;)

I've just never had that happen, or heard of that happening to anyone before. I could understand the resistance rising from heat and the efficiency dropping so they get so quiet you could barely hear them, but I would think that the voice coil would fry before its resistance would shift enough to cause a change that dramatic.

drops resistance or increases resistance? Either way, can you recommend speakers that are known for NOT being susceptible to this? it's driving me nuts.. I noticed the blaupunkts I picked up didn't tout the 'ferrofluid' cooling... that's probably one issue.

well I know Paul said the heat drops resistance, but I thought in increased resistance. After all, that's why amps are less efficient when being run at low impedences, why computers run better when they're cold, and why any electrical device becomes a superconductor (0 resistance) at absolute zero.

Ah well, it's the weekend, I don't have to think for another 2 days...screw it