What is meant by subwoofer room pressurization?

It's one of those things that you'll understand once you experience it. It's a sense that the whole room has become an enclosure for your bass drivers, and you're sitting inside the woofer's cabinet.

Good answer Bondmanp. I'd add that you get the sense also that the air around you has become vibrant/pulsing/throbbing with energy.

Bondmanp is right. If you have a good sub that can dig deep and you're minding your own business watching a movie AND all of a sudden your clothes move before you hear anything, you have experienced room pressurization.

But don't make a buying decision based on that factor. There aren't that many movies that "stimulate" you in that way. Buy one that is clean and defined down to 20hz or so and you'll be happy.

I have an SVS PB Ultra 13 and I don't run it "hot". As much as I like bass material, I don't look for it when it's just not there on the recording.

-Brew

I think of it mostly as an HT phenomenon associated with explosions, etc. where you actually feel a pressure wave. A related but different phenomenon occurs with low pedal notes of a pipe organ, where you may feel more than hear them, just as at an organ recital.

I use a pair of Velodyne HGS-15s with an SMS-1. I set the levesl so the subs are not observable sources of sound.

db

What's the point of subs if they are set so they are not observable sources of sound? I set my subs so they blend seamlessly with my main speakers.