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In Reply to: RE: The other speaker performed well and posted by deafbykhorns on May 04, 2016 at 19:02:11
What Denon? Not to forget these are LOW sensitivity speakers. Maybe 86db. AND they are 4ohm nominal which tells me to 'bring on the current'.
that being said, you DO probably have dead ribbons. You'll need to search out a rebuild kit or or a rebuilder.
These speaker suck up power like you owned stock in the Electric Company.
I don't know what you mean by 100 to 103 db. Continuous or Peak? If continuous with 115 db PEAKS than you wouldn't believe how much power you need.
Too much is never enough
Follow Ups:
As the other channel is not running out of steam, it is not the lack of power showing up. First thing, swap the speakers to see if the problem follow the speaker and not the Denon driving them.
Yes, I agree about the amp but I was only hitting maybe 100-103db peaks and it only did it on one speaker. And yes, it followed the speaker, this is troubleshooting 101.....The other speaker performed nicely, even with 125w chip amp (Denon receiver).
I didn't have an extra amp with me when I auditioned them in the sellers home. I have a couple high current amps at home but confident this would not resolve anything.
Woofers have been repaired with new surrounds.
If it were a cap, the entire ribbon should perform poorly, not just the last 8-12".
The foam in front of the ribbon has been replaced, any chance this material got behind the ribbon and caused some damage? Foam shouldn't conduct so I wouldn't believe this would cause an issue.
What about the ribbon, is this a heat/humidity sensitive material that could be shrunk with heat (similar to an acoustat)?
I was being 'smart' in my 1st post, but in my 2nd, I DID say 'dead ribbon'.
I don't know how the ribbons are supposed to be assembled, but I'm sure a problem DOES exist.
Too much is never enough
The amp is insufficient to drive the speakers to the levels you are getting. It would run out of power and clip. If it is an older amp over 15 years some of the power supply caps might be out of spec and one channel can run out of power before the other. So first swap channels to see if the problem remains on the same amp channel.Alternately try another more powerful amp.
The mid/tweeter driver can not produce the kind of problem you are describing on its own. That said, if it is the problem BG RD drivers might be available again for the DIY community as their Neo drivers have been made available recently but Parts Epress' stock is already out. An alternative is a line of Neo8 PDR drivers. Costly but very good.
The woofers are likely to have problems first since the speakers are old and they may need new surrounds (refoaming) not a costly project and can be done DIY. The problem you describe sounds more like a woofer problem. Another problem can be a crossover cap being out of spec. IIRC they used an electrolytic cap in the bass low pass filter.
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