I experienced the same hum from my DSP20. I thought is was rather unusual because at times it was very audible from a distance of about 3-4 feet. I unplugged components one by one from the P20 and the culprits were my F113 JL Audio subs. The V2 made the P20 hum louder than the V1 (Not sure why) but, I removed them from the P20 and the noise is gone. I am taking solace in the fact that its only the Subs. The noise has not returned so far. The subs are now plugged into the wall and all seems fine for now.
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Melco N1ZH60/2 ---> EtherRegen ---> Bricasti M1 SE DAC ---> ASR Emitter II Exclusive Version Blue w/Battery PSU ---> Eggleston Andra III speakers rolling on Stillpoints Ultra 5's ----> Dual Rythmik E15 Subs ---> all tied together Via MIT MA-X RCA IC and MIT Matrix SHD120 Rev.2 Bi-Wire speaker cables.
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