I would love to use NP0/C0G, but the input impedance I am driving is fixed, and demands a high vaslue coupling cap. Single supply is dictated to. I normally prefer to use plus/minus supplies and do away with almost all coupling caps. I'm trying to think when you would use X hundred nF coupling caps on audio. It implies high impedance which implies high(er) noise.
An aside - "best" capacitors I even used were glass dielectric, fully glass encapsulated, from Corning. Their stability was astonishing, and virtually zero loss. Mega expensive though, and only up to about 1nF AFAIR.
An aside - "best" capacitors I even used were glass dielectric, fully glass encapsulated, from Corning. Their stability was astonishing, and virtually zero loss. Mega expensive though, and only up to about 1nF AFAIR.
Since my original posting 5 years ago, I have come to the conclusion that the best larger-value capacitors ( ≥ ~ 2.2 µF) are the Nichicon MUSE bipolars:
Nichicon Muse ES bipolar caps measured: <-120dB THD, <-140dB IMD
Nichicon Muse ES bipolar caps measured: <-120dB THD, <-140dB IMD
