I use JJ Tesla's BLue glass matched quads and cryo'ed,however I am on the fence that once installed, biased, used some can they really maintain their balance?I have seen some do, and others balance is changed after 1 hour of use, I think it has to do with the circuits used in myself. I dont know why but the blue glass sounded better to us in Cary amps, than the clear glass.
