I have one ksw12 sub placed behind my main listening position. I sit about 20 feet from my TV. I am thinking of adding a second sub and placing it in the corner right behind my TV and Klipsch RF speakers. Is this the best position for my 2nd sub in a large 25x30 room. Should I match my current sub and get another klipsch? Do I just split the LFE line at my Pioneer Elite VSX72 receiver? Thanks for the advice.