Acoustic treatment

So you don't know the origins of sound. Tom

Earth to Tom - I know in space no one can hear you scream.

Add your can of hot air to outer space with the shear thats already there then you will have the potential of sound..just like you do here on Earth..Tom

Boy are you out to lunch on this one Tim. It is not what you hear. It is about what you feel. I would bet that you have never played with a system in which you can control phase and arrival times which is why you have this rather flaky opinion. This makes a major difference in the realism of the system. Just wire one sub out of phase and see what you get. I've got news for you. You have to be in phase the entire cross over region. If you are 1/2 wavelength out of time you have one sub wired backwards. This would be the kind of biased unacceptable opinion you swarm guys would come up with. If you think the bass you have now is good, you have a long way to go. 

Oh and geoffkait, I am a physician and we are notoriously bad at math but you keep avoiding the question which means to the rest of us that you have no idea what you are talking about.
My experience with tube traps under the most scientific conditions I could create is not good  and I do not intend on going down that road again. I see it as a waste of money. There are better ways to deal with room acoustics