Deeper cone? Is it special?

[MyFartsStink 10+ year member]

I have been wondering this for a while. So if the cone is deeper, is there more cone area? Meaning more air movment?

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[twisztdauthorit 10+ year member]

I have been wondering this for a while. So if the cone is deeper, is there more cone area? Meaning more air movment?

x2

for Ex:

2 of the same subs

1 with a flat cone and the other with a deep cone.

Any differance?

im thinking the one with more SA is gonna have more displacement ?

 

[MyFartsStink 10+ year member]

Yes there is more displacement, but is there more air movent because of a deeper cone?

 

[casper97ta 10+ year member]

This was the whole thought process behind the original Jl w3's. they had a deeper cone and were supposed to move more air. Whether or not this is true I have no idea.

 

[mdillon 10+ year member]

if it were true, wouldnt we see deeper and deeper cones instead of greater diameters?

15's that look like 5 gallon buckets.

 

[twisztdauthorit 10+ year member]

if it were true, wouldnt we see deeper and deeper cones instead of greater diameters?
15's that look like 5 gallon buckets.

that would be sorta difficult to produce...

 

[its_bacon12 10+ year member]

ok the air is pushed ine one direction.. so think of it like a piston. in the engine, will the piston be more effective or less by having a cone shape removed from the top? it still will displace the same amount..

 

[casper97ta 10+ year member]

ok the air is pushed ine one direction.. so think of it like a piston. in the engine, will the piston be more effective or less by having a cone shape removed from the top? it still will displace the same amount..

This cant be totally true. Why do think they make domed, half domed, and several other designs for the top of the piston? certain designs affect the air being pushed in different ways.

 

[Haunz 10+ year member]

It's time to go back to grade 5

 

[Haunz 10+ year member]

This cant be totally true. Why do think they make domed, half domed, and several other designs for the top of the piston? certain designs affect the air being pushed in different ways.

^ 100 %

but a sub is a far cry from a piston

 

[casper97ta 10+ year member]

I think if there is any difference between a deeper coned sub and a normal one, the difference in output would be very minimal if any at all.

 

[Haunz 10+ year member]

if the cone is deeper, is there more cone area? Meaning more air movment?

the short answer is NO

 

[its_bacon12 10+ year member]

theres more cone area, but it wont effect linear output..

and my demonstration was exaggerated to make a point. i suppose it could effect airflow if it wasn't asymmetrical but subs aren't like that. i think having a cone shaped cone increases strength of the cone, which is why its a very common design.

 

[BrianChia 10+ year member]

The curvature of the cone is like a quasilinear function -- linear movement of the cone would retain the same curvature, only shifted up and down, and thus the volume of air displaced would be the same regardless of the curvature. Bacon is right; the curvature of the cone is to increase its rigidity.

 

[audioholic 5,000+ posts]

Some companies over the years have even tried to market deeper cones for added cone area (implying more displacement potential). The 'best' company Ive seen do it, and thus my most disdain for having done it, would be Xtant a few years ago (before they got into the hex cones or whatever they are now).

A deeper cone will not gain any displecement potential, zero. This phallacy is based on a commonly misuderstood term, or perhaps a improperly used term.... cone area. We often discuss/compare cone area, when in fact the real factor is radiating surface area. Two subwoofers, both exactly 12" in diameter, one a flat cone and one a very deep dished cone. Everything else is indentical between the two subs besides the cone shape.... they can and will produce exactly the same output/displacement potential.

Imagine the cone moving back in forth in 3 dimensional space. The space it takes up as it moves back and forth is cylindrical. The flat coned sub's cylinder has a flat bottom and top. The deep coned sub has that same dished shape top and bottom, one pushing out and one pushing in, effectively giving the exact same volume of air within the cylinder as the flat coned sub. Get it yet?

This cant be totally true. Why do think they make domed, half domed, and several other designs for the top of the piston? certain designs affect the air being pushed in different ways.

You are mistaken, and it is totally true. A piston's shape affects how much volume of air is left within the combustion chamber at top-dead-center of the piston's stroke. A flat-top piston will leave a larger area in the combustion chamber than will its domed counterpart. This means that given the same stroke (piston shape does not affect crank stroke length), the domed piston will compress the same amount of air/fuel mixture to a greater degree, thus 'squeezing' more energy out of it. This is not at all the same situation as a speaker cone's physical properties or desired results.
The piston parallel only works when discussing the actual motion of the piston (up and down fashion to create the same 3-d cylinder that equates to displacement potential). When trying to apply the piston parallel to cone shape and piston shape, the parallel fails miserably.