Center channel speaker?

[Gareth]

I'm also in the camp of keeping the front three matched. If possible, I'd figure out if there was a matching center to your parents' front speakers and look for that used, or just buy another L/R speaker and use that as the center for now since we don't have to worry about magnetic shielding in the centers anymore. A proper center will still be designed better, but I'd rather have the front three match in some way, than have a mix of speakers.