jmac

[PV Audio 5,000+ posts]

whats the formula of the surface area of a paraboloid? u had it on here some time ago but i cannot find it.

Click to read more...

 

[JimJ 5,000+ posts]

What, Jmac is the only one here that can use their brain?

http://www.tricoat.com/goldstone/paraboloidcalc.htm

 

[PV Audio 5,000+ posts]

What, Jmac is the only one here that can use their brain?
http://www.tricoat.com/goldstone/paraboloidcalc.htm

naw, he had told me so i figured that he'd know //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[PV Audio 5,000+ posts]

what in the **** is that...by paraboloid i'm talking like a speaker cone....

 

[JimJ 5,000+ posts]

what in the **** is that...

It's a paraboloid...just what you asked for.

Are you talking about calculating a speaker's Sd?

 

[PV Audio 5,000+ posts]

It's a paraboloid...just what you asked for.
Are you talking about calculating a speaker's Sd?

yup. i figured that if u took a cross seection of a speaker you'd get a parabola shape...hence the parabolid/dome shape. its not really a cone because it is rounded at the vertex.

 

[JimJ 5,000+ posts]

You can basically ignore the speaker's depth...just use the diameter. For example, my e12a.22 would have no depth.

 

[PV Audio 5,000+ posts]

You can basically ignore the speaker's depth...just use the diameter. For example, my e12a.22 would have no depth.

yes i am aware of that, as the ed is flat. but for example, the 13.5" wide w7 has the surface area of a 15''....so how would they find the surface area of that?

 

[JimJ 5,000+ posts]

The page I gave you, if you really want to be anal about it.

But the bigger question to ask is why? Using the cone diameter alone is generally good enough to make any differentials between drivers...if you think about it, having a very deep cone is not going to make any difference in how much air is being moved.

 

[PV Audio 5,000+ posts]

The page I gave you, if you really want to be anal about it.
But the bigger question to ask is why? Using the cone diameter alone is generally good enough to make any differentials between drivers...if you think about it, having a very deep cone is not going to make any difference in how much air is being moved.

no no, i'm thinking about trying to build a speaker...and i want to know how deep i need the cone to be..dats why i'm wondering. but what i still don't understand why more drivers can get LOWER, i know they sweep more air thus LOUDER, but how does that make them lower? 6 3" mids putting out 30hz? someome please explain this to me

 

[JimJ 5,000+ posts]

and i want to know how deep i need the cone to be..dats why i'm wondering. but what i still don't understand why more drivers can get LOWER, i know they sweep more air thus LOUDER, but how does that make them lower? 6 3" mids putting out 30hz? someome please explain this to me

As deep as you need it to be...depends on the basket/motor/spider/former assembly you end up with. Frequency response is dependent on a lot of things, but Sd and enclosure design can determine what frequencies a loudspeaker can play efficiently. After almost 5k posts, you should know that //content.invisioncic.com/y282845/emoticons/uhoh.gif.c07307dd22ee7e63e22fc8e9c614d1fd.gif//content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

 

[marleyskater420 5,000+ posts]

As deep as you need it to be...depends on the basket/motor/spider/former assembly you end up with. Frequency response is dependent on a lot of things, but Sd and enclosure design can determine what frequencies a loudspeaker can play efficiently. After almost 5k posts, you should know that //content.invisioncic.com/y282845/emoticons/uhoh.gif.c07307dd22ee7e63e22fc8e9c614d1fd.gif//content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

No, he has about 200 posts. And 4,800 random jumbling of words.

 

[JimJ 5,000+ posts]

Ah...

 

[PV Audio 5,000+ posts]

As deep as you need it to be...depends on the basket/motor/spider/former assembly you end up with. Frequency response is dependent on a lot of things, but Sd and enclosure design can determine what frequencies a loudspeaker can play efficiently. After almost 5k posts, you should know that //content.invisioncic.com/y282845/emoticons/uhoh.gif.c07307dd22ee7e63e22fc8e9c614d1fd.gif//content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

no no no no, u misunderstood me. i dunno how to explain it....oh well. but i was wondering if i could move any more air if i had a more concave cone...THATS what i was trying to ask.

 

[JimJ 5,000+ posts]

No, no...you misunderstood me, because I already answered that //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

if you think about it, having a very deep cone is not going to make any difference in how much air is being moved.