Help me insert preamp between HT receiver and amp

Hi,

I just got a NAD 1700 preamp and NAD 2600 amp. I currently have a harman kardon DPR 2005 HT receiver.

I'd like to connect the analog audio from my dvd player to the preamp directly to play 2 channel stereo sound. That is all fine and dandy. I'd connect the digital coax from the dvd player to the receiver for DTS/DD/etc processing. From the receiver L/R channels preout, I'd like to connect to the preamp. The NAD 1700 doesn't has an auxiliary input. It has CD, Video, Phono, Tape1, Tape2, etc but no AUX input. can I take the preout from the receiver and connect to any unused input such as Video, Tape1, tape2, etc on the preamp ?

Thanks

Mudit