If the LV12R has deeper bass then SVS and bests the SVS by even half a db in midbass, I would consider this an upgrade more so than a lateral move. In my listening environment, I cannot even come close to using the midbass output on the LV12R as it will be just too loud. I'm after deep articulate bass and an even frequency response and the LV12R delivers both.The LV12r will have more deep bass output, but probably won't have much more mid bass output. In some respects this is a lateral move. If I were you I would save up for something better, a solid, all around upgrade instead of just moving a tick up. I would be thinking about one of the 15"s from Reaction, Rythmik, or Hsu.