Tweak: raising the subwoofer off the floor...

Yes, I have done this myself and like the results. I have a Vandersteen 2Wq. I took the spikes off the bottom and placed it on a Billy Bags amp stand with Vibrapods between them. I think it works great. This only raises it off the floor a few more inches. My plan is to buy an ASC(Acoustic Science Corp., makers of the Tube Trap)sub stand. This compines the benifits of the sort of decoupling I am using now and a bass trap in one. Check it out on their site.

Matchstickman, Bass builds up in corners as standing waves. The sub stand is just like a short tube trap in a different shape and designed to sit under the woofer. The Tube Traps reduce some of the mud, boom, and colorations that happen by breaking up standing waves by a combination of absorbtion and diffusion. Read their blurb on the traps and it will explain it more to you.

Warrenh, You don't understand because you have not tried it, you just buy into their pitch and are their most vocal salesman, that's fine. I do what works for me in this area and you do what works for you.

I think so. It all depends on where you have the sub. If the sub is not in the corner I think Tube Traps in the corners would still be a good idea. Are you still looking into going with the Vandersteen subs Matchstickman? I love mine and it works great with a bit of care setting it up. I think the sub stand should give me even better articulation and some added punch.