Just to add my personal experience, my new Ma252 is dead silent, ear to speakers, with a silent test track playing 100% volume. I will keep an eye on it for this hum.
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Living Room
Nad M12 preamp with BlueOS card, VPI Prime Signature Turntable, Lyra Delos Cartridge, McIntosh MC462 amplifier. Focal Sopra 3 speakers. Salamander Archetype rack, Butcher Block Acoustics base, VPI periphery ring outer clamp, Wireworld Electra 7 power cords, Silver Eclipse 7 XLRs, Audioquest Niagara 1000 power conditioner and Audioquest Oak speaker cables. Herbie's Tenderfeet, Cone and Hush Puckies isolation feet. GIK Acoustic's bass soffits and 244 bass trap Art panels room treatments. Sony XBR75X900e 4K TV and Sony UBP-X800 Blu-ray player
Spare Room/Office
Parasound Hint 6 Integrated amplifier, Dynaudio Contour 20's, Bluesound Node 2i, Audioquest Red River RCA interconnects. GIK Acoustic's Impressions Series panels
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