Comparable to Marantz SR7005?
I currently have a Marantz SR 7005. I love it. I'm running two Vandersteen Model 1c's (Speaker A), two Klipsch Heresy ii's (Speaker B), and a huge Vandersteen 2W Subwoofer. I listen to music from the phono input using a turntable, wirelessly from my phone to a Chromecast device, and through the Spotify app from my TV. I do this using the HDMI ARC cable that runs back and forth from my tv to the Marantz. MY AT&T cable box is also attached to the Marantz.
My question is, if I move to a 2 channel system (I have my eye on a pair of Klipsch Cornwall ii's) could I replace my Marantz SR7005 with a two channel Preamp/Amp combo, like an older AdCom or something, that does not have HDMI? Would I need Optical at the very least? Or could I run the whole thing RCA style?
Also, if I could do this, what would be a good Preamp/Amp or receiver for a two channel system that can accommodate music listening and TV watching?