Amp heat sinks are ringing


I have been working to reduce the slap echo in my room by using quick hand claps, and various foam panels to attenuate the noise. I have discovered that my Classe CAM 200 monoblock heat sinks are actually ringing- they can be excited by handclaps, and heard across the room. There are 10 heat sinks per amp, about 2" deep by 8" high. Running my fingers along the heatsinks makes them ring like a bell!

I am concerned that this ringing might be excited when I am listening to the system, and may add extra treble noise.

Does anyone have any suggestions for damping out the noise? I am concerned about using a material that can withstand the heat, and not impede the airflow?

thanks for your help!
gnobber
Pm: It's not a matter of whether the change is good or bad, but that it DOES change. As such, the sound that you are used to and may have worked hard to achieve can be altered for better or worse.

Gs: Thanks for the link to Goldman's solution for this problem. Like i said, it ain't pretty or simple : ) Sean
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There are a couple of alternatives that I have used succesfully:
1- Use small strips of bycicle inner tube less than 1/2 in wide rolled up to adequate thickness and push them between adjacent fins down to close to the fin base (shoot for this dimension when you roll the strips not the outside gap between fins). If you choose to do this in the lower part of thew vertical fin they'll be hardly noticed with several advantages, it´s a reversible tweak, tube is black as the fins are if needed can be done at middle height, add more etc. The effect on convection is minimal and you can kill the vibes.....
2- Use a small wire or better a small aluminum piece and adhere it to the fins with a hot melt adhesive gun in the underneath the lower portion of fins.
3- You can also bridge the fins with the holt melt adhesive and decrease the ringing acordingly.

Some options are far more effective than others and easier to implement depending on how careful you are the other too can be used but there's more potential problems So weight the options and the compromises you might get into.
I prefer the first one since it´s easy and totally reversible.
Have fun and kill the ringing.
Got it Sean-- but many of these fixes are easily reversable so I think we should plunge on in and see what happens- at least that's what I'm going to do.
Didn't read the whole thread -did anyone suggest using spring-type wooden clothes pins? Clamp the suckers ON!
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