Oh you definitely should run the auto set-up variant you have. A lot of stuff a receiver does is based on the filters set by the auto setup. If the Onkyo mic is from a receiver with Audyssey then there is not a huge worry. Else check OLX or pro fx service center for the correct mic.I have not tried Audyssey because
1) I'm using a Marantz 5006 at the moment so not sure how good the Room EQ will be
2) I don't know if my Onkyo mic is good to be used with the Marantz (its a standard mic so I think it's fine)
3) I Don't trust Audyssey in the AVRs that are typically in my budget
MaSh