The YST-SW315 is a great sub for the price. It has a MOVIE selector and a MUSIC selector that work very fine. Sometimes, when the sub is placed in a certain way, it sounds very good with movies (explosions, dinosaur steps) but sounds very boomy with music. When the MUSIC switch is engaged, the boomyness is taken away and a more defined-articulate bass is present.
Many people in this forum think Yamaha speakers are pieces of junk and it's not true; and they may criticize this MOVIE-MUSIC switch, but i had that sub for 6 months and it worked very fine and sounded much better that other comparable price subwoofers.
For $250 bucks, the price is fair.