About 6 months ago, I did an in-home audition of the PH5 and thought it sounded quite good. In its' price range, however, it has a LOT of stiff competition. (I eventually bought a "low mileage" Bryston BP-1.5 phono preamp for $1100.)
Since you asked for opinions, here's mine, FWIW: I think you should spend the money on a really good preamp instead. Feeding a high-resolution signal from your analog front end into the Adcom does not, to my mind, make good sense. Don't misunderstand -- I'm not bashing Adcom -- I have owned a good deal of Adcom gear, and also sold it professionally. That said, I would not pair the AR PH5 with an Adcom preamp.
Since you asked for opinions, here's mine, FWIW: I think you should spend the money on a really good preamp instead. Feeding a high-resolution signal from your analog front end into the Adcom does not, to my mind, make good sense. Don't misunderstand -- I'm not bashing Adcom -- I have owned a good deal of Adcom gear, and also sold it professionally. That said, I would not pair the AR PH5 with an Adcom preamp.