thanks sherod. my amps are rogue audio m150s. I done basically what rogue has done with there m180 upgrade. the m150s came with mcap 2.7 caps. rogue put in polysytrenes bypassed with .27 mundorf supremes. did not like it , so I took them out and replaced with 2.2 mundorf supreme. what ever i have done there is less body and color in the mids, they seem darker now. less forgiving. maybe its the caps, maybe its some other part of the upgrade ? thanks for any sugestions, chris