Need Help Choosing A Subwoofer

They are very different from each other. The Hsu is large with a large driver, is ported and has a large amp. I barely use it for music because my floor=standing speakers go to 34 Hz. Not much music goes below that, but some does. My REL is a small one, Q108E, but in using it with my small bookshelf speakers which go to 50 or 55 Hz, it is really wonderful. I forget its there. It is small and out of the way, but when i turn it off, the bottom is gone. For only $700, it is great at what it does. I spent $900 on the Hsu, then upgraded the amp to Mark II. I am very happy with both!

The Onix rocket UFW-10 would serve well in your room. You might try corner loading the sub you wind up choosing. You are likely going to have some interesting null/peak challenges in your room.

Yeah...a 10x10' room? You definitely can forget the 4x15" subs with mono's! Call it a hunch(lol).
Yes, you need quality well integrated fast solid bass. I think it's reasonable to say you'll be staying with mass marketed, and forgoing the custom DIY, ya think? And, actually there's enough good subs out there that, set up well (the key), will do you proud really.
For that room, I like dual fast 8" subs (even push/pulls, like MX stuff from M&k, for instance MX70), or subs with a tight "Q", even more musical vs, monsterously sloppy and boomy. Read a reivew or two...then choose wisely

Not to sound snipity but bass is not fast.If the "Q" is low enough and the F3 is typical of an eight inch driver what is deemed fast is rolled off bass, in other words it's a woofer not a subwoofer.

DIY is not for everyone, that is a fact.Yes, there are enough mass market subs out there.Vandersteen got around this with (3) 8" drivers with separate amps for each driver.The "Q" is adjustable also.A couple of these used would do you well.

The (4) 15's is an example of what I needed to acheive a response in my room.All the subs I listened to failed to dig as deep as my DIY system.Laughing out loud fails to help and only creates problems.Lets learn from one another and help this member find a sub that creates sound he can enjoy for years to come.

Good luck with your search. KG

Kgveteran,
I see that you brought up the (3) 8" Vandersteen. I have been looking at that sub also. How do you think that it would stack up to the Def. Tech. Supercube II? To give you a little more info about my system; I have Boston Acoustic VR950 front speakers, VR940 rear speakers, and the VRC center speaker. I watch mostly action/sci-fi movies and the music I listen to swings more toward rock. And additional subs worth looking at? Thank you for everyone that has provided me with some help!