What is the best subwoofer you have ever heard?

Well Matjet, I like subs that augment the main speakers and blend well. So for me it is the REL Britainia series. I have the B2. If you don't connect it off the main amp...then it will never blend and you will always be tweaking with it. I hate that, I never touch my REL its AWESOME.

Bo1972, I have always used my EARS to dial in my REL sub,it sounds very well integrated and does not muddy up my super fast main speakers (Dynaudio). The REL is very fast indeed and accurate.The REL allows my main speakers to be faster! And Its my EARS that tell me this Not some device. Not theres anything wrong with measurments but at the end of the day its YOU who has to like what your hearing. "If it sounds good, it is good". My quote of the day ..lol

I listen to music with my REL Britania series NOT helicopters and explosions, so my views are reflective of my 2 channel audio exp. The REL studio series are not good musical subs.They are meant for HT. I like a sub that has the woofer facing you for best musical sound. Not one thats pointed at the floor.

And IF any one post that SUBS are meant to be felt not heard is full of %$#@! because you have never heard a great sub then.