physics of a sub and moving air

[2loud4uboyz]

I am not making fun of you Evil one. But never heard it explained in atoms that I can think of right now. Thinking I may but just have forgotton. For me lot of cone and power and ported box,

[Broke_Audio_Addict]

Fluid dynamics.

[3vil]

I am not making fun of you Evil one. But never heard it explained in atoms that I can think of right now. Thinking I may but just have forgotton. For me lot of cone and power and ported box,

Box doesn't have to be ported, but it helps. Other than that you have the right idea. I'm pretty sure if you had a demo vehicle in the vacuum of space, you won't be getting and bag/shirt tricks.

[Esgedi]

It's the same as how wind blows things around. The air around us is a mixture of gases, including but not limited to: nitrogen, oxygen, argon, and carbon dioxide. The atoms of these intermixed gases are bumping into each other all the time, and when the woofer drives forward it displaces the surrounding atoms. Those atoms move and slam into other atoms, which slam into other atoms, and so on.

Eventually those chain reactions of bouncing atoms run into hairs, or plastic bags, or shirts or whatever. If you have a large amount of cone area (Sd), and a large amount of movement (xmax), you can push a lot of atoms around.

I like this. do you know what kind of energy this is? also how does cone size relate to that? my 3 tens vs 1 18?

Legitamitely curious, do you really not get this? Not trying to sound condescending at all, but it just seems so basic to little ole' highschool dropout me. Essentially what's happening is a change in pressure in the envelope of the cabin. When the woofer cones move toward the back plate, the cabin is in a rapid state of decompression, meaning air from the outside will rush in (airflow willing). When the cone extends, the cabin is in a state of compression. This means the pressure in the cabin will increase, and air will attempt to escape to the area of lower pressure (atmosphere, outside).

[rfbasshead]

I get that the In and out movement of the sub is what's giving that effect. I wanted to know the science behind it. I'm doing a science project and I want to know the physics of it. I don't want to just go up and say "the sub moves in thus sucking air in, the sub moves out thus pushing it out" I want to be able to go in depth about it.

[Triticum Agricolam]

I suspect that some of these vehicles that do wicked hair/shirt/cat tricks the entire cabin is acting as a Helmholtz resonator (like a ported box). This would be one possible explanation for the large amounts of air movement.

If you wanted a good science experiment you could try to prove if that's what is happening or not.

[Jessica]

Try to explain why a sub that handles 500 watts and the same xmax as a 5k watt sub playing exactly the same freq. As each other so technicaly the same speed, but one moves way more air than the other.

[Broke_Audio_Addict]

Try to explain why a sub that handles 500 watts and the same xmax as a 5k watt sub playing exactly the same freq. As each other so technicaly the same speed, but one moves way more air than the other.

I would see it like a 200 horsepower car doing 0-100 vs a 2000 horsepower car doing the same assuming all other things are equal.

Sure they are both getting to the same endpoint but one of them is doing it a whole lot faster which would equal a lot more violent reaction.

[rfbasshead]

I suspect that some of these vehicles that do wicked hair/shirt/cat tricks the entire cabin is acting as a Helmholtz resonator (like a ported box). This would be one possible explanation for the large amounts of air movement.

If you wanted a good science experiment you could try to prove if that's what is happening or not.

I have 2 cars with systems. 2000 Tacoma single cab 3 10" p3 sealed, t1500bdcp, t400-4, Dynamat everywhere, ho alt, and battery bank

2015 Corolla 2 10" p3 prefab ported box. Hifonics 1950.1 stock electrical.

The truck moves a lot more air then my car. Can I just say that the theory is bigger systems that do hair trick turn the car into the box. Take my two systems that run the same power (on paper) and say that because my trucks can is smaller there for it moves more air? And expand on that? I haven't done a science project in almost 10 years. I really do appreciate all the feedback and help from you guys ?

[Jessica]

Try to explain why a sub that handles 500 watts and the same xmax as a 5k watt sub playing exactly the same freq. As each other so technicaly the same speed, but one moves way more air than the other.

I would see it like a 200 horsepower car doing 0-100 vs a 2000 horsepower car doing the same assuming all other things are equal.

Sure they are both getting to the same endpoint but one of them is doing it a whole lot faster which would equal a lot more violent reaction.

But both cars are going 0-100 in the same amount of time.