If I understand you correctly, you want to split the preamp outputs for each channel (left and right) of your Denon receiver to power two amp channels (for each speaker) of the Rotel power amp to enable biamping your speakers, correct?
Click on www.monstercable.com, then on "Search" at the top of the Home page. Key in "Y connector" and you'll find the audio Y connectors. You'll need two male-to-two female RCA Y connectors. Be careful wiring this up. Make sure the Rotel power amp can be connected in this fashion, because the Y connector will interconnect the input stage of two amps simultaneously. You might find the connectors at a local audio or parts store as well.
Regards,
Alan Lofft
Axiom Resident Expert
