Hi and welcome to the Axiom forums,
Your room is 3,000 cu. ft, which definitely qualifies it as medium large (an average living room is about 2,100 cu. ft; a "small" room, about 1,500 cu. ft, and a large/huge room is 4,000 to 8,000 cu. ft).
Your room is certainly big enough that you could appreciate the the deep bass extension of one of our tower speakers--the M80v2 or M60v2--plus a subwoofer if you want deep bass down to the 20-Hz region. By illustration, some movie soundtracks have lots of low bass at 20 Hz and even deeper (War of the Worlds remake).
No tower speaker can reproduce a lot of output below about 28 Hz (the M80v2 has good output to that frequency, but not nearly as much as a good subwoofer like the EP350v3 or EP500 will produce). The bottom string on a grand piano is at 28 Hz.
Smaller bookshelf speakers like the M3 and M22 have useful audible output to 40 Hz (that's the bottom string on an electric bass or acoustic bass), but it isn't very powerful, hence a subwoofer will extend deep bass output another musical octave lower. Your room isn't so large that you could not use a bookshelf speaker plus sub combo like the M22 v2 plus the EP350 subwoofer. That will get you performance almost as good as the M80v3 tower, however the tower speakers will play at extremely loud levels, whereas bookshelf speakers do have limits. The M22v2 with a sub is no slouch but it can't match the clean powerhouse levels of the M80 or M60 towers.
You should use the VP150 center channel in a room the size of yours.
Regards,
Alan
