There's nothing to stop you running an interconnect from the Pioneer pre out to a line input on the Rotel preamp - so the Rotel pre/power will pick up any one signals from the Pioneer.
Question is - why do you need to use both ?
Connecting Audio
Hello everyone
I just purchased a Rotel Pre-Amp. RC-1070. I bought a Amp. Rotel RB-870BX a few years ago. I was using it with my Pioneer Receiver SX-950. The Receiver is connected to Equalizer/ Reel to Reel/ Turntable with a turntable Phone Amp./CD Player/Cassette Tape
Could I still use my Pioneer Receiver as 2nd Pre-Amp. since the RX-1070 has a
2nd set of OUTPUTS? Thank-You for your thoughts.😎