Sub sounds lost in new room. HELP

MSALLA
MSALLA Posts: 1,602
Moving into our new home, my living room is 12 x 25, watching & listening to the TV from the 25 foot length. I have a psw303 sub. I guess it's the size of the room but the bass dies out about mid way through the room.
Do I need a new sub? If so what do you guys recommend? I like a good punch for movies and I use bookshelf speakers so I rely on the sub for most of the low end sound.
Michael


Samsung 50" HD DLP
Yamaha RX-V2500
(2) Outlaw 200
Adcom GFA 555
Sony BDP300
Denon 2900 DVD
Lsi9's mains
Lsi7's rear
Lsic center
12.1 SVS driver in 4.53 cuft. tube
Harmony 880