The home theatre bypass option is the only real solution.
Here's a current list of amps and preamps that have the functionality.
https://www.audiophile.no/en/articles-tests-reviews/item/426-amplifiers-with-processor-input
Good luck.
2 Channel & Home Theater
Hello:
I just acquired a McIntosh C55 and MC257. I, also, have a Marantz 7703 pre and 8077 amp. I would like to use the McIntosh for 2 channel music and Marantz for HT. My speakers are B&W 703 S3, HTM71 S3, JLAudio f10 and B&W 705 S3 signatures.
I have my Innuos ZENmini mk3 and Denon DP-62L connected to the McIntosh for music listening.
What would be the best way to connect the components so I can switch between 2 channel music listening or HT.
Thank you for any help you can offer.