I have an older Panasonic TC P50ST30 (release review/specs here) that was generously given to be by another Arsian that does have ARC support (I think). The TV sitting in front of an old but nicer ...

First, yeah I know don't use a TV for a center channel. I know all about it so please don't post if that's all you're going to say. I have a home theatre receiver that outputs to the usual speaker ...