I'm building a 7.1 system and looking for some advice on rear surround.  Here's what I've got so far:

Front:  RF-7

Center:  RC-7

Side Surround:  RS-7

Rear Surround:  ??

No sub yet - but my RF-7's don't seem to mind too much. 

I've found a pair of cherry RB-5's for sale that look like they'd fit with the rest of my Reference 7 system.  I'd love to find a pair of RB-75's, but those - especially in cherry - will be hard to find and expensive if I do find them.  I want to stay with direct radiating speakers for the rear because the system will also be used for multi channel music.  At a later date, I may add direct radiating side surrounds for multi-channel music as well.  Down side to the RB-5 is a rear port, so they'd need to be on stands away from the wall.  I did notice the RB-5 and RS-7 use the same woofer, and same size 1" tweeter.  Suggestions?  Opinions?

 RB75 is the perfect match due to the larger horn driver. But RB5 or RB35 would do nicely also. Make sure to set them to SMALL in your processor.

I have a second set of RB5  in oak that I'd sell if you are interested. 

Michael

 ^^^^ what he said.

one question....how far are you from the rear wall?  i ask because i have some rb-61's pretty close and am not liking it too much.  i am going to see if some rs-52's work out better.  

 In my experience 5-6 feet from listener to rear wall seems to be the cutoff point at which you might be best served by more WDST speakers as rear surround. 

 Well, I'm probably going to be about 2-3 feet from the back wall, but I want to go with direct radiating speakers for music.  I may be able to play around with the mounting location.  

I've got all Cherry speakers so far (except the RS-7, obviously), so I want to stay with that on anything else I get.