It is a bad idea, drop it. It is just a waste of time. Nothing to do between an “integrated” home cinema amplifier and a high end stereo integrated amplifier.
If you want a good sound for home cinema, try to find a “surround decoder” (multichannel preamplifier) and separate multichannel power amplifier(s)
If you want a good sound for home cinema, try to find a “surround decoder” (multichannel preamplifier) and separate multichannel power amplifier(s)