i don't have the technical answer and wonder about this also. i started using the pyramid ps-3kx 3 months ago and it sounds great. not a huge change but i don't like the wall wart and music fidelity's power supply was too expensive for me. you probably know this but check the polarity before hooking the unit up if you do get one. don,t trust the lettered cord because mine was opposite what some might think due to the lettered cord being negative.
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