Two answers: electrically yes, its okay. Worst that may happen is you pick up some ground loop hum. Which might be bad or might be zero but in any case won’t break anything. But sonically no, its never okay to have a AVR connected to a stereo. The whole purpose of HT is artifice. Show. Glitz. Artificiality on steroids. The whole purpose of stereo is quality. Substance. Palpable you-are-there-ness. The two are at odds.
Connecting AVR and stereo therefore is never a good idea, other than as a temporary stepping stone to eliminating the AVR and all its multi-channel crony cabal components. Except for the subs. Those you can keep.
Connecting AVR and stereo therefore is never a good idea, other than as a temporary stepping stone to eliminating the AVR and all its multi-channel crony cabal components. Except for the subs. Those you can keep.