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#### humandrummachine

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What makes the acoustic wave or whatever it is made by subwoofers/speakers seem louder?

Is the sound wave bigger or something?

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More Amplitude/Pressure.

Larger on the Y axis

#### humandrummachine

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Good thing im taking math

#### minbari

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More Amplitude/Pressure.

Larger on the Y axis
exactly. most people put 200 watts on their entire front stage and then slap 1500W on the subs. more SPL = more louder

and yes, the wavelengths are longer as they get lower. they get stupid long as really low freq. 20hz is about 56 ft across!

#### humandrummachine

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The waves must start out small? Can they really go from nonexistence to 56 ft. long in an instant?

I don't even really understand what wave length is. Say this is a sub "<" and this is a wave ")". Is it like this <)))))))))))))))))))) ? What parts would be the wave length here? I'm thinking it is the height of the ")" or the y axis

Is there width?

#### trumpet

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wavelength would be the distance between any 2 similar points between the waves. the distance between the start of one wave to the start of the next for example

#### humandrummachine

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alright thanks

#### Eric Stevens

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The waves must start out small? Can they really go from nonexistence to 56 ft. long in an instant?
They travel at the speed of sound which is 1,126 ft/s (@ sea Level)

The sound we hear is a combination of frequency (cycles per second) and level or amplitude (pressure)

#### humandrummachine

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when the waves start though, from a subwoofer, say a 10", does the wave length start out at 10" and then progressively get larger to 56 feet if it were a 20hz wave/frequency?

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no, i think you aren't visualizing this correctly. if you are hovering above a pond and drop a stone, it makes waves. however, waves aren't studied from that angle. we look at waves from the side, so that they look like rolling hills which are cut in half. the wavelength is the distance from one peak to the next and the amplitude is the height of the hill. read that wikipedia link and the links to any terms mentioned which you don't understand, that should help.

#### finbar

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when the waves start though, from a subwoofer, say a 10", does the wave length start out at 10" and then progressively get larger to 56 feet if it were a 20hz wave/frequency?
20hz into a sub will produce a 56 foot wavelength, or part thereof, from the moment the signal is applied.

#### Eric Stevens

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when the waves start though, from a subwoofer, say a 10", does the wave length start out at 10" and then progressively get larger to 56 feet if it were a 20hz wave/frequency?
The wave doesnt start out as any size really. The wave radiates outward in all directions simultaneously.

When the subwoofer finishes creating the full wave form ( 1 full cycle or something like this > ~ ) if it were in free space the start of the sine wave would have travelled 56 feet total in any given direction.

How much pressure is being radiated would be the SPL that it is producing.

Eric

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The wave doesnt start out as any size really. The wave radiates outward in all directions simultaneously.

When the subwoofer finishes creating the full wave form ( 1 full cycle or something like this > ~ ) if it were in free space the start of the sine wave would have travelled 56 feet total in any given direction.

How much pressure is being radiated would be the SPL that it is producing.

Eric
I typed something, realized that it was WAY over the level of where we are at now......

So I'm leaving this here as an edit

#### humandrummachine

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Alright, so do the waves produced by the subwoofer run away from the subwoofer in all directions?

Is it like a gun shooting a bullet or a stone being dropped in the water?

#### minbari

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well now you are getting into acoustics. lower freqs are "less" directional, but they do still have a direction.

#### 94VG30DE

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bcae1.com, for once you get "sound" figured out.

#### humandrummachine

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Or are you guys telling me this wave literally goes everywhere at once? And i should forget about the subwoofer propelling it any sort of direction? Is that possible doesn't the wave have to start at some point and travel?

Right now im visualizing this wave as an explosion basically. But I don't see how it could travel in every direction if the subwoofer is moving in one direction and the backside of the subwoofer is covered by a box.

#### humandrummachine

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well now you are getting into acoustics. lower freqs are "less" directional, but they do still have a direction.
I think i see what you are saying. Are the lower frequencies less directional because they are so big?

#### HondAudio

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