Inherent hum was not audible with either Nighthawk and Mani 2. Turntable motor induced hum was evident with either phonostage when the volume was cranked up with a test record playing silence (I don't advise this). The Mani 2 does come with a standard Schiit power brick. The Mani 2 seems to have another advantage in that I could use higher gains without clipping. The advantage of an AC power supply is the higher rail voltages.