Eric,
Yes, you can use the SC35 as a power amp.
1) Connect the analog outputs from the new preamp into the
SC35's Multi-Channel inputs (MULTI CH IN) shown here.
2) Set SC35 mode to
Pure Direct (i.e. none/least signal processing).
3) Set SC35
volume to Zero dB (that is a high volume setting); sound volume will be controlled by the preamp.
4) If you have a programmable remote (i.e. Harmony or equivalent), program it to turn on both the preamp and SC35 as a system.
I used such a set-up to leverage a beefy amp section of an older Yamaha AVR to reduce the surround load on a newer AVR that had the newest modes and codes.
Cheers,
XEagleDriver