Definitive Technologies is generally regarded as the speaker brand for home theater crowd rather than the audiophiles (those who listen to primarily music). While the speakers generally sound very good with music, they are stellar for movies- especially the action kind. This subwoofer is no different.
The ProSub line is Def Tech's "entry" level line of subwoofers (and the ProSub 1000 is at the top), but the construction is top notch. Don't get me wrong, nobody will ever confuse it for a $1000 REL, Bowers & Wilkins, or Martin Logan, but at the same time, it FEELS high quality. It's also pretty heavy- which is a good thing. The finish is matte black, which isn't very exciting- but it also won't pick up finger prints when it's touched.
As with any speaker, a proper break-in is REQUIRED to get the best performance. Don't go home, plug it up, and just blast away- it needs a few days of low volume listening. This will dramatically increase the life of the sub and give you the best output.
Now for the sound quality: Musically the sub has quite a bit of range. I listened to several different types of music (from Ludacris to Enya) and the sub did a good job overall. Like I said, however, it's in movies where it really shines. Gunshots are not only heard, they are FELT. Explosions will shake the room (and in my case, brought complaints from neighbors). This is by far the best sub I've experienced for movies (easily better than my $1500 Bowers and Wilkins). Playing Call of Duty Black Ops was a thrill- every gunshot and thrown grenade was a heart-thumping experience.
At $500 this is a solid pick for any home theater, however, if you're listening to music 100% of the time, then a Martin Logan or B&W (or even Def Tech's SuperCube line) will be a better fit.
-VOLUME CONTROL IS ON THE SIDE!! This is a huge bonus- not having to reach behind the sub to turn the volume down is a big help!
-Movies and Games sound incredible, heart thumping, wall rattling sound
-Excellent Build Quality
-Good, but not great for music