Do Waterbox's exist for subs?

[hoss 5,000+ posts]

water is not easilly compressed, so a full box of water would not allow the cone to move.

not only is it not easily compressed... it cant be compressed //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

thats the whole principle with hydraulic lifters/cylinders.

 

[volonau 10+ year member]

Bass freq. travel through water much further then air.

Why this matters, not sure.

 

[GO-N DEF 10+ year member]

Just thought I would add something to this conversation. I have been in a few pools before that had underwater sound systems. I am not sure exactly how they set them up, but the sound quality isn't even close to as good as normal speakers. It just didn't sound even close to as sharp as normal sound waves traveling through air. It was pretty cool though:naughty:

Might have something to do with the fact that everything would sound mono underwater because sound travels so fast that you are unable to determine where it is coming from.

 

[helotaxi 5,000+ posts]

Speed of sound will only affect the possibility of standing waves inside the box, the SOS being higher in a denser medium would make the wavelength longer for a given freq. A standing wave would be nearly impossible. The noncompressibility of the medium in the box would not allow the sub to move inward at all. Also, since the transmission of sound to the air requires enough vibration to compress and rarify the air and water won't compress, it wouldn't transfer low freqs to the air.

We had an underwater system installed at college and you could better hear the PA system in the pool area while underwater than you could hear the transducer system while out of the water.

 

[theCybe 5,000+ posts]

I thought we were talking about bongs?

Anyway, I'd expect distortion underwater. There was a thread somewhere where I posted the speed of sound underwater.

 

[squeak9798 5,000+ posts]

I have only heard of transducers being used in depth finders and other infrasonic sound application. Do they really make transducers that can produce music?

A speaker/subwoofer is a transducer. An electrodynamic transducer.

A "transducer" is simply an electrical device that converts one form of energy into another.

 

[Vincent9515 10+ year member]

Water is a more dense medium...therefore the speed of sound is greater, making the box appear smaller. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Sound travels slower in a dense medium.

 

[CBFryman2 5,000+ posts]

speed of sound in air: ~340m/s (depending on temperature and air pressure)

Speed of sound in water: 1482m/s (depending on temperature)

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[CBFryman2 5,000+ posts]

not only is it not easily compressed... it cant be compressed //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
thats the whole principle with hydraulic lifters/cylinders.

Water can be compressed, but it takes a LOT of force to do it, and it cant be compressed very far. it has to be compressed ot else sound wont travle through it.

Bass freq. travel through water much further then air.Why this matters, not sure.

Very true. Wales communicate from miles away with low level low frequincy sounds. Finding nemo is biologically acurate....lol.

 

[Vincent9515 10+ year member]

speed of sound in air: ~340m/s (depending on temperature and air pressure)
Speed of sound in water: 1482m/s (depending on temperature)

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I agree that it travels faster in water.

Density is just not the cause of that. It's due to the stiffness/rigidity.

Air pressure does not effect the speed of sound in air.

 

[CBFryman2 5,000+ posts]

air presure affects air density... //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

hotter travles faster because the particals have more energy.

colder air is more rigid but travles slower.

Pretianing to the SQ of sound underwater. I'd imagine that it is because you sitl keep a bubble of air in your ear. When the wave travles form water to air it hits a less dense medium and part of the wave is reflected erect. from the ear drum to the water agian the wave is reflected inverted.

 

[theCybe 5,000+ posts]

Also, sounds like it would have to be monaural, reflections from one source would be bad enough, let alone multiple pointsources.

 

[CBFryman2 5,000+ posts]

and yes i understand that less dence generally faster slower but between water and air water is faster //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[CBFryman2 5,000+ posts]

Also, sounds like it would have to be monaural, reflections from one source would be bad enough, let alone multiple pointsources.

and with the waves travleing faster and for longer distances you would have ltos of reflections and positive and negative interferences all over the pool hittin your ear all the time. //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

but that is pretty much what you just said. lol

 

[Vincent9515 10+ year member]

Air pressure does effect density.

The air particles have more kinetic energy, so a given amount takes up a larger volume. Therefore, the density is less in higher temperatures which is why sound travels faster.

Thus the speed of sound increases with the stiffness of the material, and decreases with the density.

In fact, assuming an ideal gas, the speed of sound c depends on temperature only, not on the pressure. Air is almost an ideal gas.

The equations for the speed of sound are above the first quote.

speed = sqrt (coefficient of stiffness / density)

So, the higher the density, the lower the speed of sound.

Article...

http://en.wikipedia.org/wiki/Speed_of_sound

EDIT: I go look for quotes and then you said what I quoted. //content.invisioncic.com/y282845/emoticons/furious.gif.fc81ca146dbff91fede3ed290dbc4f4c.gif

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