Time has come for a change (svs)

[eclimax13]

ok...the time is coming where im getting a little bored...my main theater is fine but i just dont feel my living room sub (polk) is doing my movies justice...so here's my dilemma...move the svs to the living room and get an pc ultra for the theater room or leave the pc plus in the theater and get a different (smaller) sub for the living room...the living room is only 13x11 and the polk fills it with more than enough bass..just not great bass...

so how much better is the ultra?...is it worth the upgrade over the plus...is the plus too much for the living room? suggestions on a different living room sub that can hit low?