I just took up Nick's offer at trying my Prime PSU at his place.
Well his Prime PSU was silent (feintest of hums if I put my ear to the metal case) and mine was not. Even when powered through his AC/AC regenerator (ie better than a DC filter) and > meter+ away.
As others have stated, no reason why my Prime PSU should be not be equally silent. My first one seemed even louder.
Meridian owner since 1992 Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).
That's two defective units, maybe a supply or production issue? I would want confirmation the third one was perfect before having it sent to me. I would trust Des as you say.
It's Meridian's new green policy to prevent people leaving stuff on 24/7.
Main system - Sources (Kodi-HTPC, Vero 4k, FireTV, Sat) into Trinnov Altitude 32 (8-16) (+Roon), Trinnov Amplitude 8 amp & Vivid Audio (Giya G3, V1.5) and REL Stentor III speakers. Others: F80 + Raspberry Pi and other Pi systems.
It's Meridian's new green policy to prevent people leaving stuff on 24/7.
The Hum bug appears to be growing in strength, however my system is as yet not infected. With all "noisy" devices (including MD600's) and domestic appliances turned off I cannot detect any discernible Hmmmmmmm... from Prime + PS or 5200SE speakers.
Hector
AV: Thorens TD160B, SME, ShureV15MK2, 500, 598, 861v4, DSP7200.1, DSP3300HC Samsung UE55, SkyHD. DINING: MS600, AC200, DSP5200SEUG. STUDY 504, Roon Nucleus + RevB, 808v6, 5200SE, Mac & PC (Touch Screen), Prime+PS Grado GS1000i HORIZONTAL: M80, MS200, Red Rose Spirit + Sonus Faber Toys, iPad Mini A capella to Zydeco
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