sir vic, hindi ba mas maliit yung 9.1 how would the 9.1 sound at higher volume? and how about the 9sr, would this be enough for a 25 to 30 sq. meter room along with the 9.1?
Before you decide which speaker is best for the room, you need to determine 2 things: 1. How big is the throwing distance of the speakers you are considering to buy. 2. What is your listening preference for the speakers--for music and movie or purely for movie?
You have a big room of 30sq meters. Is this a dedicated home-theater room where speakers should be big enough to fill up the room? If this is so, then you have no other option but to get a bigger set-up speakers like 9.6 front, 9cm center, a pair 9DFS (side or rear) surround, an option (if you are considering 7.1 set-up) of another pair 9DFS for rear-surround, and a powered sub of 12 to 15".
With the above set-up, a pair of front floorstanding speakers becomes fitting for both movie and music. It can excel music because when the receiver is switch to either stereo or pure audio mode--when subwoofer and other surround speakers were cut-off--, the 9.6 becomes a dedicated pair of stereo speaker system that can handle the whole spectrum of musical frequency.
If, however, you have a big room, but your home-theater listening area is in one corner, you may opt for a smaller set-up: a pair of front bookshelf either 9.2 or 9.1, 9cs center, 9dfs surround, and a powered sub of either 8 or 10". Unless your preference is to listen to whole spectrum of music, you don't need a floorstanding to fill in your small corner of movie watching.
So you see, the decision of buying the right speakers should be based on your requirement and purpose. Added to this is your taste. If your taste is just as good as mine, you will find 9.1 to sound better than 9.2. 9.1 sounds more detail and transparent; it sounds also richer and warm. If you are into music and movie, you may want 9.1 to occupy your small space. 9.2 will be your last option for movie watching at a bigger space irregardless of better sound quality.
By the way, the 9SR is applicable for surround, though it can also be used as 5 units small satellite home-theater set-up. The 9SR is for home-theater use, not exciting for music.