AVS Special Member
Join Date: Nov 2003
Location: Derwood, Maryland
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Pressurization is a bad term in that to pressurize something requires either more molecules in a fixed volume, decreasing volume with a fixed number of molecules or a heating of a fixed number of molecules in a fixed volume. Volume in this case is cubic dimensions, not what we hear.
When talking about subs, you're creating sound waves which is a temporary increase in local pressure followed by a corresponding decrease in pressure. This is what our ears detect as sound. You're not really pressurizing the room, you're unevenly distributing the air molecules. The smaller the time interval between the peak and trough, the higher the frequency. The greater the difference between peak and trough pressure, the louder it sounds. Pressure in this sense is really just higher volume. If the volume is high enough, we not only hear the sound, but we can also feel it. I think this is what people mean by pressure. Feeling the sound in addition to hearing it.
I don't think a sealed room is required to feel sub pressurization, but it helps.