my thought is this, i cant stop from laughing since i see that you posted "special" range of bass. special is a funny way to describe audio sound. lol. did you mean spacial? one letter different but perhaps more fitting when talking about range...

seriously though, id think those two subs are excessive for that room. also, how does the lfm produce great highs? putting two subs into a room can be a blessing or a curse, because they dont always work together seamlessly... then again sometimes it is awesome. what makes you think that the svs sub isnt musical?