leave the front (stereo speakers) connected to the cyrus 8,that way you use the cyrus as normal when listening to cds via your cd6.
when watching a movie using the 875,turn the volume on the cyrus 8 until it corresponds with the volume on the 875(mine is halfway exactly on my cyrus 8) then the cyrus powers your front speakers with the onkyo powering the rest.
That how i do it and it works a treat.
Anybody do it differently?
cheers.