Many different systems over the years ranging from Tannoy DC2000, through Amphion Xenons, to QAcoustics, and also active Kefs and recently ATC (on the speaker side). Amperes delivered by Pioneer, Belcanto, Electrocompaniet mono's (loved them!), quad, Nord, and one or two I dont recall. No vinyl (because I know it would become an expensive obession), CDP of note the Classe beast, but a long time FLAC streamer and DAC fan.
I work in digital storage and have supported some noteable HiFi manufacturers over the years via my job as an applications engineer. So any questions of this topic, I am happy to help with.
Not sure why I have never joined this forum, been a long time Pinkfisher and WAMmer (and hifichoice from the early days before the WAM)!