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Isolation and Harsh Highs?

Hello I isolated my tube preamp with some equa footers. I notice a lot more detail and the sound is much cleaner and focused but I also notice the high are now kinda of harsh. Currently my system is on Lovan glass shelves and I have a couple maple platforms coming which will hopefully help matters. I would imagine the isolation revealed some brightness in my system I had not noticed before. Any ideas?

My System is
VPI Scout/Blackbird Cart/SDS/on Ginkgo Cloud 9 Iso platform
Granite Audio 770fp preamp
B and K Reference 2220 Amp
AQ Diamondback IC
Sonus Faber Concetos on sand filled stands
autodexr
chashmal
605 posts
 
I have heard many people say that glass makes things really bright and can turn into glare. I believe that maple is really the best, which why I use a maple platform for my amp. I wish I had maple shelves for everything!
stringreen's avatar
stringreen
5,112 posts
 
..even better than maple is lexan - 1 inch thick of medical grade....
tvad
9,467 posts
 
Glass makes for a poor shelf since it rings and transmits vibrations so readily.

I read about a tweak in these threads that I have found works really well. Sanford ArtGum erasers. No joke. About $2 for three. I use them under my tube preamp.

Stringreen, what differentiates medical grade lexan, and why would medical grade lexan be preferred in an audio rack application?
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