Your Onkyo TX-NR609 does not have the necessary line level outputs for this.
The Harmon Kardon DPR 2005 has the outputs but, as you note, lacks other significant features.
A lash-up solution would be to get a pair of speaker-to-line level adapters for the L/R speaker outputs of the Onkyo so that you can use an external amp.
A better solution is to get a new AVR with the features and power you now need.
The Harmon Kardon DPR 2005 has the outputs but, as you note, lacks other significant features.
A lash-up solution would be to get a pair of speaker-to-line level adapters for the L/R speaker outputs of the Onkyo so that you can use an external amp.
A better solution is to get a new AVR with the features and power you now need.