Fastest subwoofer?


Hello, I would like to buy a subwoofer that complements a pair of very fast speakers. I know very little about subs since I rarely used them, and I am wondering what are the models that are considered to be extremely fast and good, no matter at what price point. Thanks.
ggavetti
I'd like to try it with two very different speakers: a pair of tiny Sonus Faber Minima (the original ones), which go down to about 70Hz, and then a pair of Ocellia Kedros, which have the famous PHY driver. It has deep bass, but I think it would benefit a lot from something that takes over under 80Hz.

As for space, it's more a matter of look than space...the Paradigms look cool, while most subs are ugly black cubes.

Thanks
+3 or+4 for Vandy 2Wq......2 of them of course :^)
I've had REL Stadium II and there is no real comparison.
Fast, clean, deep and most importantly.......leaves the signal to the main speakers absolutely pure and untouched.
I have owned the Vandersteen subwoofer and it is very good. I like how it connects to the system relieving the amp and main speakers of the lowest frequencies. However, I feel the REL is better and is much simpler to connect and dial in to the system. The REL does not sound like a subwoofer it makes bass music.