Used Rowland 302 or H2O Signatures CD Direct

I am looking for an amp to run a pair of Magnepan 20.1 speakers. I have heard great things about the H2O Signature Amps. My main concern is I have no preamp and don't plan on using one. I am using an Audio Aero CD Player directly. So the question is does the H2O amp require an active preamp? If so then would I be better served grabbing a used Rowland 302? Also I have read that the H2O requires a shielded Power cord. Does the unit come with one or would I have to buy one?

Thanks for your help...