Whats the purpose of pressurizing a room with a sub? - AVS Forum | Home Theater Discussions And Reviews

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post #1 of 5 Old 04-14-2008, 11:46 PM - Thread Starter
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I hear a lot of talk about making sure the sub is able to pressurize the room you are putting it in. What does this do exactly? If the sub can't pressurize the room what are you missing?

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post #2 of 5 Old 04-15-2008, 09:36 AM
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Envelopment and realism, When an explosion happens in a movie, most people want FEEL it. Pressurizing a room does exactly that.

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post #3 of 5 Old 04-15-2008, 01:08 PM
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Originally Posted by terminatorbob View Post

I hear a lot of talk about making sure the sub is able to pressurize the room you are putting it in.

Pressurize refers to frequency versus room dimensions, and the term is often tossed around incorrectly. At very low frequencies, where a single wavelength cannot fit in the longest dimension, the frequency can still be heard. But instead of being a true wave it's a change in pressure. For example, a 40 Hz wave is 28'3" long, so playing 40 Hz in a room shorter than that will "pressurize" the room. That's an overly simple explanation, but hopefully makes the point.

What really matters with subwoofers are:

1) How low in frequency they can play to
2) How loudly they can play
3) How much distortion they produce at various sound levels

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post #4 of 5 Old 04-15-2008, 01:27 PM
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Like the others have said, It creates a real environment like you are there. I remember when I was at a restaurant and a big dump truck pulled up to the stop light. It was at idle, the windows were shaking, the room just pressurized, and you can just feel its prescence(from 30 feet away). That is what to strive for, real events in your HT.

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post #5 of 5 Old 04-15-2008, 01:42 PM
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Like the others have said, It creates a real environment like you are there. I remember when I was at a restaurant and a big dump truck pulled up to the stop light. It was at idle and the windows were shaking and the room just pressurized and you can just feel its prescence(from 30 feet away), that is what to strive for, real events in your HT.

Applause ... Applause! That's exactly it.


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