Thanks for the information! Personally, I'd rather have an adapter to EQ since I don't always have the same source. Would an impedance adapter drop where you say it's necessary? I'm actually only experiencing a little sizzling (maybe more static like sound) in the T, Th, F, and Z sounds, no sibilance though. It's not bad, but it would be nice to have that under control. Also, I'm not a big fan of the grey or red filters, they don't have the same airiness the blacks do.