I am making an esphome system for my old Yamaha AV receiver. RCA out via a cheap i2s chip, mems I2S mic in the enclosure that can hear well enough in the room, and an IR blaster output to change the AV receiver channel to the esp when voice is activated and change it back after.
Cool side effect is that it can also be used as an HA media player for streaming Spotify and local music to the speaker system.