Summary: I selected this subwoofer after doing on line research and reading owners reviews. Frankly, the relative low power from the amp concerned me. I am using it in a 14x 21 ft room and on movies with low frequencies can literally rattle the windows and is not anywehrfe near max power. So, as others have said, it provides plenty of power. The sound is very clean and doesn't have the "muddiness" i hear in many home theater sound systems (including my old one).
Summary: I hooked this up with my Denon Audyssey receiver and let it do the calibration... ended up with a -12dB for the subwoofer - which is as high as it goes... wow - I was worried this sub wouldn't be as loud as the one it replaced but now I'm recalibrating it at half that volume... amazing. Sounds great so far!
Summary: There are a fair amount of reviews saying that this sub is not as good as the psw 505. They both have their pros and cons. First of all I got this sub cheaper because I got the tsx330T's so that in itself is an amazing deal. One thing you notice is when you order this it comes in a massive box, this is because this is a giant sub it dwarfs many other subs i've seen and two people could sit on this thing because of its size.
Pros: Low bass, cleanness, variety of connection options, versatility, stability, no port noise like the psw 505
Cons: Amount of bass, space needed for placement, non- removable grill, non perfect matching with Polk speakers. Retail price.
Summary: I originally bought this for music listening mainly, but this sub really shakes the room and makes video come alive. I was hesitant to get this vs the powered DSW PRO 440wi (8" sub). Downside was the power. Since I got the Yamaha RX-A1020 I figured the pre-out would be enough and it surely was. The bass is very clear and loud if you want it to be. I have a 15' x 32' room that opens up to hallways to the rest of my apartment.
Pros: Lots of bass, punchy, clear and will shake the room. Absence of power is not an issue at all using pre-outs. Fills my 15' x 30' room easily.
Cons: Its big. And I mean BIG. I had to rearrange my setup just to fit it in the room. Cannot change the firing direction like with the DSW line. Possibly too much bass for my apartment.