Musical Design D-150B amp- What"s its input impedance? Would a OPPO 205 directly in work?

Thinking of buying an OPPO 205 and using it as a "preamp" for the rest of my system and selling on my Bel Canto 2.5 doc/preamp.  Anybody doing this?
Not sure about input impedance but using the 205 without a preamp works well for me. The well executed tube output stage is very smooth and sounds great direct to my Benchmark AHB2. I have also tried a Linear Tube Audio MZ2 wth excellent results. I have no need for a preamp.