AVS Special Member
Join Date: Aug 2004
Location: sierra ecuadoriana
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To playback Hi-Res audio, you certainly want quality components. I don't know about 50w though. I suppose there are small tube amps of that size. In SS amps most likely you'll find 100w.
I also play Flac, AIFF audio. I use a Parasound P7 analogue pre-amp(its a 7 channel) It has analogue BM and a Parasound 220w power amp or my HK Citation 19 100w amp. The thing about those amps is at low volume, its pure Class A amplification.
You can certainly look for vintage audio gear, get more for less. HK Citation series are good values, For current amps Parasound Halo series are very good.
As for power, it always better to have more than less. More speakers are damaged by under powered amps, thus causing distortion, than by higher powered amps.