Debunking Audio "Truths" - Open Baffle Speakers don't Pressurize The Room
Sound, the final frontier. These are the voyages of the shit disturber John on his 5 year mission to seek out the nonsense and to boldly go where no audiophile has gone before.
Sound is energy that travels through a medium. For most purposes, air is that medium, so we need to understand how sound behaves in it.
Sound waves are so-called pressure waves that have a high pressure peak and a low pressure trough. That peak to peak amplitude is the strength of the energy of the wave. A larger peak to peak value will be louder.
As sound energy moves through air, it form a region of high pressure that's immediately followed by a region of low pressure. The air in the space is being energized by that sound energy - in other words (and perhaps wrongly), it's being "pressurized".
But it's SOUND pressure, not air pressure.
When you hear the word "pressurize", you probably think of blowing up a balloon, but sound doesn't work that way. The high / low pressure nature of sound energy means that there is no net change in the air pressure of the room the sound is playing in.
So there will be no rushing out of air when you open the door of a "pressurized" room that's being "pressurized" by sound.
The sound energy is, as I described in the video, making the air molecules vibrate more (and less) than they normally would, very much like a big block of jiggling jello.
Now this only happens (this pressurization idea) below what's known as the Schroder frequency. That's the dividing line between sound behaving like rays and sound behaving like pressure.
When low frequency sound is being put out by a speaker, it will energize the air, regardless of what type of speaker is making the energy. In other words, 40Hz at 90db is still 40Hz at 90db whether it comes from a sealed, ported or open baffle speaker. Sound energy is sound energy, no matter where it comes from.
So saying an open baffle speaker won't pressurize a room is simply not true.
Ergo, saying that open baffle speakers don't excite room modes is ALSO not true, since room modes are excited by the SOUND ENERGY a speaker produces, not the speaker itself.
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