The best coupling caps in power amp ?? Mundorf, Infinicap ??

Duelund’s Cast-PIO-Cu caps ARE more resolving and open, than any that I’ve tried over the years. I don’t want to hear anything but the original music and venue, without any editorializing. Duelunds are just less, "there" and allow me to hear further into whatever’s on my recording. I’ve had four in my Cary SLM-100 monoblocks, for a few years. btw: Some say that foil orientation doesn’t matter with stacked caps. Testing for noise proves otherwise.

YEP, "variables"!    Semantics, perceptions, systems, aural acuities, references(if any), etc.   Of course, the better(to me, more neutral/transparent/clean/natural/quiet/fast) ANYTHING(tubes/rectifiers/caps/cables/special copper/silver) swapped into the total system, the more obvious strengths OR weaknesses upstream will become.   The natural tendency(for most) would be to attribute whatever perceived differences might be exposed, to the new component(s).       "Best" will always be subjective.