I am not sure if you are talking about using an external amp or the extra channels on the Pioneer avr. First question is why? What speakers are you driving since the the SC 07 will swing somewhere near 270 watts at 4 ohms. Most of the time you are using less than 5 watts unless you listen extremely loud.
Klipsch RF 7 based HT 7.4, Pioneer SC 35, Acurus 200 Five, Dayton 18 Ultimxa Dual Sub Cab(2), Dayton 18 Ultimax Large Vented Sub Cab (2), on Berhinger I Nuke DPS amps, Samsung BDP F 7500, Asus/My Book Live HPC 4 TB
Yaquin VK 2100 amp, McIntosh XR 5 speakers, Samsung BDP F 7500