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sharp and piercing high pitch /frequency coming out from Harbeth C7

I have a problem with the sharp and piercing high pitch coming out from the C7 40th anniversary speakers when sometimes listening to the soprano or complicated loud passage in CDs. I changed the speaker cables from Analysis Plus Oval 12 to Transparent Musicwave which has a filter for frequency. It got better but not totally elimiated. Any solution for this ?Thank you!
amylai888
twoleftears's avatar
twoleftears
5,318 posts
 
You need to try a different amplifier to try and locate the cause of the problem/verify that it's really a fault in the speaker.  The standard process of elimination.
kenjit
1,771 posts
 
what frequency
mlsstl
1,436 posts
 
I agree that you should try a different amplifier with the speakers, and also perhaps a different CD player, though I think the odds are better with the amp.

I had a CJ preamp some years ago that ended up with a bad capacitor in the power supply that generated noise beyond my range of hearing. It was only when my son visited from college and pointed out the issue that I became aware and was able to fix it. 

There is also the possibility that your amp is running out of power when you hear the distortion, but you really didn't say how loud you listen, or in how big of a room.

Lots of possibilities, but you just have to work through all of the components one at a time to find the cause.
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