Hi Stargate, Yes I went with the M5 because my room is 12x13x8. I also really like the simplicity of it. I know one woofer 15” will be plenty in that room. This is a dedicated music room so set up just to accept the system. I will be powering through a Manley Stingray iPod. I am hopeful that 20/40 watts of Manley tubes will be plenty. Happy to let you know how it works.