Cone area calculator

[spencer321 10+ year member]

Listen co ck head... I'm sure you think you know it all.... but maybe you should set your bloated ego aside and think for second....



If you don't believe Audioholic maybe you should get a second opinion from a physics professor; or a 10year old who knows shit from beans... //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

so because audioholic said it, than its fact? i'm not doubting he is knowledgable, im simply stating a mathamatical fact about volume.

 

[audioholic 5,000+ posts]

i never said we did... the person who started the thread labeled it "cone area calculator" but was actually calculating the area of a circle not a cone, i corrected this fact and all hell broke loose. after we established that yes a cone has more area i was told a cone and a circle moving the same distance has the same volume which is only true if the distance is greater than depth of the cone which you proved, thats established, but a subwoofers excursion rarely exceeds the length of the depth of the cone.

So if you seem to agree we dont need to know it, why was it necessary to 'correct' the OP over what was, at best, a disagreement over his choice of wording?
All hell broke loose due to your wording.

 

[spencer321 10+ year member]

We all passed 2nd grade geometry...
You're forgetting the cone only moves up and down, the third dimension doesn't make a difference...and if you really thought about my example in detail and imagine each individual microscopic subdivision, and then imagine we just shift the ones in the middle UP so that its even, how does that make any difference in how much air is displaced?

why doesnt the 3rd dimension make a difference.... the 3rd dimension is whats creating displacement which is the other contributing factor to volume.

and i "think" i get what you mean but if you think about your own example and mine were talking about the same thing i think, you saying if you took the center and pushed it up to make it a straight line across right?

if thats the case and you did that, the sides would extend even farther out because by laying the center flat your making it wider there isn't enough room in the diameter to "shift the ones in the middle up so that its even" which is my point... if there was enough room than the area of a circle would be the same as the area of a cone

 

[Rashaddd 5,000+ posts]

why doesnt the 3rd dimension make a difference.... the 3rd dimension is whats creating displacement which is the other contributing factor to volume.
and i "think" i get what you mean but if you think about your own example and mine were talking about the same thing i think, you saying if you took the center and pushed it up to make it a straight line across right?

if thats the case and you did that, the sides would extend even farther out because by laying the center flat your making it wider there isn't enough room in the diameter to "shift the ones in the middle up so that its even" which is my point... if there was enough room than the area of a circle would be the same as the area of a cone

THE ONLY DISPLACEMENT THAT EFFECTIVELY OCCURS IS FROM THE AREA DIRECTLY PERPENDICULAR TO THE DIRECTION OF MOVEMENT

 

[spencer321 10+ year member]

So if you seem to agree we dont need to know it, why was it necessary to 'correct' the OP over what was, at best, a disagreement over his choice of wording?
All hell broke loose due to your wording.

because everyone was under the assumption that pi r^2 gets you the surface area of a cone which is not true... i was trying to contribute and because everyone "knows" pi r^2 is how you get the surface area of a subwoofer i was crusified for saying otherwise.

and what did i say specifically to cause an argument like this, other than make a point that the OP's method was incorrect and try to provide reasons and examples why its not that simple.

 

[Rashaddd 5,000+ posts]

because everyone was under the assumption that pi r^2 gets you the surface area of a cone which is not true... i was trying to contribute and because everyone "knows" pi r^2 is how you get the surface area of a subwoofer i was crusified for saying otherwise.
and what did i say specifically to cause an argument like this, other than make a point that the OP's method was incorrect and try to provide reasons and examples why its not that simple.

when we use pi r^2, we are not talking about the actual surface area of the CONE we are talking about the EFFECTIVE surface area of the cone, which is once again, the surface area directly perpendicular to the direction of movement, ie pi r^2

 

[spencer321 10+ year member]

THE ONLY DISPLACEMENT THAT OCCURS IS FROM THE AREA DIRECTLY PERPENDICULAR TO THE DIRECTION OF MOVEMENT

yes but when the direction of movement is coming from mutiple depths of that surface your create more volume

 

[spencer321 10+ year member]

when we use pi r^2, we are not talking about the actual surface area of the CONE we are talking about the EFFECTIVE surface area of the cone, which is once again, the surface area directly perpendicular to the direction of movement, ie pi r^2

i understand that, thats the point i was trying to correct to begin with, the effective piston area is that of the entire cone, not just area equal to the widest part of the driver.

 

[mrogowski 5,000+ posts]

You are all gey

Someone close this friggin thread

 

[Rashaddd 5,000+ posts]

yes but when the direction of movement is coming from mutiple depths of that surface your create more volume

omfg...guys...we've found another king ranch

you're lucky i dont feel like spending the time and effort to make a detailed graphic explanation of this and make you look like even more of an idiot than you are..

 

[spencer321 10+ year member]

yeah i think im done, besides its all irrelevent unless your competing and 10ths of a decibal are important. pick a sub that sounds good to you and be done with it, end of story

 

[audioholic 5,000+ posts]

so because audioholic said it, than its fact? i'm not doubting he is knowledgable, im simply stating a mathamatical fact about volume.

You are correct in that my diagram only applies to speakers whose excursion exceeds diameter. Im confident enough in myself and my knowledge to not feel threatened by being wrong. Even when someone is calling me a moron and accusing me of failing 8th grade math in the process.
My error was not in the math. From your description of yourself, I have at least as much formal math as you do. So clearly your subsequent comments about my knowledge and intelligence were not just wrong, they were inflamatory. So again if you wonder why this thread turned so sour on you, and why so many people were willing to agree with me rather than you, even when you were right, should tell you something.

 

[spencer321 10+ year member]

omfg...guys...we've found another king ranch
you're lucky i dont feel like spending the time and effort to make a detailed graphic explanation of this and make you look like even more of an idiot than you are..

please be my guest... correct me so i will be able to agree with all of you because right now based on mathamatical principles im familiar with i cannot see your point of view, well i see it i don't agree with it.

 

[Rashaddd 5,000+ posts]

i understand that, thats the point i was trying to correct to begin with, the effective piston area is that of the entire cone, not just area equal to the widest part of the driver.

Not true...

Its not the entire driver, but its also not the entire cone, its the flat area of the cone

 

[spencer321 10+ year member]

You are correct in that my diagram only applies to speakers whose excursion exceeds diameter. Im confident enough in myself and my knowledge to not feel threatened by being wrong. Even when someone is calling me a moron and accusing me of failing 8th grade math in the process.
My error was not in the math. From your description of yourself, I have at least as much formal math as you do. So clearly your subsequent comments about my knowledge and intelligence were not just wrong, they were inflamatory. So again if you wonder why this thread turned so sour on you, and why so many people were willing to agree with me rather than you, even when you were right, should tell you something.

i appologize for the childish comments i made, i just couldn't understand what was so hard about area displaced is volume(which everyone agreed), and i even got people to agree a cone has more area than a circle and still they displace the same volume somehow....