different types of cones

[squeak9798 5,000+ posts]

If you wanted to spread the wave out, a convex cone would work. (That would rule, does anyone make them?)

I believe you are talking about a dome?

http://www.partsexpress.com/webpage.cfm?&DID=7&WebPage_ID=286#midrange

DLS and (IIRC) Dynaudio have some as well

 

[Spkrman]

lets remember... the cone is the same in the front, and the back //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[supa_c 5,000+ posts]

Titanium concave isnt anywhere on this list

 

[Scarenius 10+ year member]

Those 2 inch mids I got are concave titanium cone. Insanely stiff stuff right there. Makes for very accurate sound. I love them.

 

[Steven Kephart 10+ year member]

As for material, if the cone is stiff enough to do it's job, power to it. Paper cone + ribs would work wonders, unless you're aiming for 150+dbs. I don't know how much pressure a reasonably heavy paper cone could handle.

Well Scottie Johnson finally stopped folding cones on our paper coned subs. I guess he measured 181 dB down at the location where the sub was folding so that should give you an idea. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Paper cones offer the best stiffness to weight ratio for a given price. Some exotic cones can do a little better, but are much more expensive. And they can have their issues too. An example is that aluminum is easily dented.

A cone shape will always be best as a flat cone will need to be so much thicker to provide a similar stiffness. This greatly adds to the Mms of the speaker and can limit your design some. They also are a little harder to impliment the T-joint, but with a good engineer that shouldn't be a problem.

Steven Kephart

Adire Audio

 

[AznRevlAzn 10+ year member]

I have been wondering, how about a sub with paper convex cone with a flat titanum cover or better yet Carbon Fiber? Wouldn't that work? Aand don't some manufacturers make them?

Could i just buy a sheet of carbon fiber, cut it to the circumference of the cone and permanently attach it to the face of the cone? I think that would be a great idea!

 

[Spkrman]

I have been wondering, how about a sub with paper convex cone with a flat titanum cover or better yet Carbon Fiber? Wouldn't that work? Aand don't some manufacturers make them?
Could i just buy a sheet of carbon fiber, cut it to the circumference of the cone and permanently attach it to the face of the cone? I think that would be a great idea!

yea, you could technically do that with any sub

how well it would work... you'd have to find out //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[AznRevlAzn 10+ year member]

Has anyone here in the forums even attempted to cover the cone with carbon fiber with say a .3mm or .5mm sheet?

 

[NDMstang65 10+ year member]

Those 2 inch mids I got are concave titanium cone. Insanely stiff stuff right there. Makes for very accurate sound. I love them.

just remember...it isn't necessarily the cone shape or material...seeing as how transient response is a direct product of Bl and Mmd

//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[audioholic 5,000+ posts]

XXX's have traditional paper cones with a convex full cone sized plastic dustcap. Not alot of people realize that. That Brahma is paper too. I believe the DD's are paper, etc. Alot of top quality subs use paper, even if it doesn't look like it from the front.

 

[Steven Kephart 10+ year member]

just remember...it isn't necessarily the cone shape or material...seeing as how transient response is a direct product of Bl and Mmd
//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Actually transient response is a direct product of inductance. BL and Mmd effects efficiency.

Steven Kephart

Adire Audio

 

[Scarenius 10+ year member]

It's all over my head, anyway. Haha. I guess with a full size convex dustcap, you *could* make the entire cone convex. It'd be nice, but weight could be a problem. Maybe something to experiment with? Like inverted mounting of subs, only there's no grill or magnet or driver restricting air flow. Blah.

 

[NDMstang65 10+ year member]

Actually transient response is a direct product of inductance. BL and Mmd effects efficiency.
Steven Kephart

Adire Audio

Inductance as well...

But with 0tm Bl you have a transient response of what? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Steven Kephart 10+ year member]

Inductance as well...
But with 0tm Bl you have a transient response of what? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

That's because the BL is infinitely effecting efficiency. But two speakers playing the same output level with different BL's but the same inductance will have the same transient response, everything else being equal. However two subs with the same BL and differing inductances will have different transient response.

Is that like saying that transient response is effected by the tinsel leads? After all if there are no tinsel leads, there is no transient response either. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Steven Kephart

Adire Audio

 

[NDMstang65 10+ year member]

That's because the BL is infinitely effecting efficiency. But two speakers playing the same output level with different BL's but the same inductance will have the same transient response, everything else being equal. However two subs with the same BL and differing inductances will have different transient response.
Is that like saying that transient response is effected by the tinsel leads? After all if there are no tinsel leads, there is no transient response either. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Steven Kephart

Adire Audio

Gotcha. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif