Denon pma-2000 IV remote question...

Would the remote for this unit control the 1650 cdp?
Yes as per page 11 of the owners manual, the RC-858 remote control unit can control CD players manufactured by Denon.

My 2000R remote (different model number) can also control my 1500RD tuner (only the stations stores in memory). The 1650AR is in another sytem and never tried it.