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Dahlquist DQ10 issues

I have a set of Dahlquist DQ-10 that sound great, but if I listen at moderate volume for 30 minutes or so the right one begins to fail. It almost sounds like a completely blown speaker.  when I turn the system off and go to use it again later, it seems fine. If I listen at lower volumes, it seems to work just fine for as long as I want.

I thought perhaps I had an amplifier issue, so I tested by listening until I started to hear the failure, then replacing with another speaker and it was fine (I will hook up to a different amplifier as well, but I’m fairly confident it’s the speaker).

is it possible there are components in the speaker that are overheating that are causing an issue?  i’ve never had symptoms like this with any other speakers.
jleluga
mijostyn's avatar
mijostyn
8,156 posts
 
jleluga, Swap channels with the speakers. I would like to make sure the same speaker fails hooked to the opposite channel. All you proved is that the good speaker is ...good. 
Assuming it is the speaker my guess would be that you have to rebuild the crossovers. You want both channels to be exactly the same so you will have to rebuild both of them by replacing components with like parts. It is the capacitors that need to be changed followed by resistors. Coils do not fail unless somebody cuts the wires.
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rodman99999
5,977 posts
 
Your DQ-10 pair was manufactured with metalized Mylar capacitors.    Film caps don’t age, dry out or leak as do aluminum electrolytics.     Unless a resistor burns: they don’t typically go bad either.    If there were an issue with the crossover, or the drivers: it wouldn’t be intermittent.     That’s: unless there’s a loose connection or corrosion (ie: a wire loose at the 5-way, corrosion in the fuse holder, etc).    Next time the symptom arises, swap the speaker cables between channels (L & R, either at the amp or speakers) and when the problem follows: you’ll know if it’s upstream (a cable or component fault).
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