The HS-251 is totally silent when used with SDD drives. Problem is that you cannot upgrade RAM which limits it to 2GB, possibly not enough for running the QNAP plug-in without crashing.

This far I have not had issues, everything runs fine, but I have imported less than 50 highres albums, I may be facing issues later...

818v3, Trinnov Altitude 32-16, 271, G68ADV, UHD722, DSP8000(U)SE, DSP5200 (SL), DSP5200HC (SL), DSP3200, 4xDSP320.2, G98, MS200, Prime HA, Ex2, 561, 598DH, 504, Roon Lifetime, Roon Rock, 218, Oppo 103, Panasonic UHD9000