Well I just tried the "herbies" under my big-ass-monoblocks.--(Refers to CJ 8xs monos) Cain't believe how much they add--all good,btw.(and cheap,too.) Mr. Herbie is giving me .0000000005 cents commision on each million he sells from my recommendation. If you got tube amps, sitting on nothing but an amp stand;I think you will be impressed.