My room is only 11x10 x 9 and I have Thiel CS3.7's in there. For over a decade I was hearing that you need a large room for these speakers so I held off from buying them. However, recently I put in room treatments and then Convolution file based DSP and the CS3.7's sound about 95% as good as in a much larger room. I no longer am working on improving the acoustics of the room just trying out different gear. I use ROON to run the Convolution.
Room size.
I often see folks recommending speakers (or discouraging) certain speakers based on size of the listeners room. While I have a good idea what would be considered a small room (both length and width no more than 15 ft), I am uncertain on the drawing line between a medium/moderate room and a large room. Would a 15 x 20 ft be considered medium, and 20 x 25 a large? Disregarding room height for now.