My home was wired for surround sound in one room, and I'm finally setting it up! I installed the L & R front speakers a few years ago (Niles HD650), which have a 6-ohm nominal independence. Last week I purchased a Yamaha HTR-5890 surround receiver, NHT M-5 center channel speaker (6-ohms), and a JBL E150P subwoofer. My front L & R speakers are in the wall, same height as my built-in tv-cabinet (about 6 feet off the ground). The sub is to the right of the couch (main listening area), near the corner of the room. The center channel has it's own compartment in my custom-built TV-cabinet and is a foot or so above the TV. Lastly, the rear-channel L & R speakers are wired to be on the ceiling directly above the couch. So, I'm not too clear on independence and if I can mix different speakers with different ohm ratings. I'm having trouble finding a good selection of rear surround ceiling speakers that are rated at 6-ohms. Should I purchase 6-ohm speakers or could I use 8-ohms? Can anyone recommend some nice in-ceiling speakers for my rear channels that would sound nice (and work well with) with my setup? My budget for these rear channel speakers is about $350 for the pair. Any help would be much appreciated!