2. amps-preamps
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Speaker internal amp shutting off due to heat

Hello guys, 

I hope I could get some more information from your expertise. The problem is very simple.

I have 1 Martin Logan speaker that has 2 class D internal amplifier inside to power just its 2 woofers. The problem is, if the room is anywhere approximately 80 degrees F and above, the internal amplifiers would keep shutting off and on.

This problem has shown itself more than a year ago and I’ve confirmed through 100s of timea this is indeed an ambient temperature problem. The other identical speaker has no such problem in all circumstances.

So my question is, is there something specific inside the amp that is failing for it to be so sensitive to temperature? And is this something inexpensive to fix?

Additional information, I don’t play them loud at all. If it’s hot like 85F, amp would ahut off a minute after the speaker turns on. No it isn’t near sunlight. Thanks for any help.

samureyex

Showing 1 response by samureyex

samureyex's avatar
samureyex OP
261 posts
 

I've talked to ML before and replacing the 2 amp modules is about $600. But they recommend replacing the entire thing for $1k. 

@buellrider97 I have troubleshoot with all sort of cables. None helped. Basically I've troubleshoot it to the point where I know exactly which day the amp would shutoff and which day it would operate normally.

As stated in the initial post. There's another identical speaker that is operating flawlessly.

@gs5556 What you said was very helpful and was in line of information I was hoping for, thanks.

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