Funny, that's exactly what I did as well. Put my EP500 on the couch in the main listening position and then crawled around. To me it was just logical as that way the driver would be reasonably close to actual ear position. Never thought about what I'd do with an EP800 or SVS cylinder sub! Twin EP800's on a couch - what a great mental image!

Dan
On-Wall M5HP LCR, QS8 & EP500 in 7.1