I agree with the other reviews, it's best to set the dials to about 1/2. If you spend the time to really dial this in, the sound is incredible. You may need to adjust the frequency (Hz) going to your other speakers to ensure most of the bass goes to the sub. After I did this, I was blown away

It's pretty big and heavy. But it's worth it

Got this PSW108 to compliment my JBL PB12 on my 7.2 system and it does just that. Music and movies, AWESOME!

i brought these subs for 100 apiece at bestbuy along with the polk audiio t50 floorstanding speakers .i came home and hooked the speakers to my sony str520 reciever in 2.1 mod for music listening and it sounded great with all genres of music i set the controls on the back to thier center position and never touched them i have one sub to the left of one floorstander and the right of the other about 3 feet from the back wall and it sounds great i'm goona hook up ile rest when my apt finish getting renovated andi go up to the 7. reciever from sony(coming soon) but for the meantime ill enjoy these polk products (highly recommended!!!)