Years ago I bought the following speakers and receiver for my home theater setup.
Speakers: Klipsch KSF-10.5 fronts, KSF-S5 surrounds, KSF-C5 center, and a KSW-15 subwoofer, (all discontinued now).
Receiver: Yamaha RX-V795
The room size is 19' X 22' on an open floor plan that continues into the kitchen area, so there is no back wall for speakers. My surrounds are located on the side walls inline with the listener. At the time I paid quite a bit for the set up and I am happy with the Dolby Digital 5.1 sound. Now I see if I want to replace my receiver with a newer one they are all for the most part 7.1. If I bought a 7.1 receiver and only hooked up my five speakers and subwoofer, it would be all right and still sound good, I would just be missing out on the effects the back surrounds create. Is this correct?