Speaker cone designs and their effects
 

Hey guys,



Recently I've been wondering why certain speaker cones are designed the way they are, and what effects these designs have on the sound produced.



I really don't know how to describe other than to post pictures, so here goes:



First, the design that most readily fits the definition of a cone:

https://img.photobucket.com/albums/v...ointedcone.jpg



Then those with a rounded dustcap:

http://image.europeancarweb.com/f/16...r2+speaker.jpg



Flat dustcap:

https://i131.photobucket.com/albums/...o/Rainbow3.jpg



A pointed dustcap:

http://forum.ecoustics.com/bbs/messa...509/504158.jpg



Finally, speaker with phase plug in the middle of the cone.

http://www.aespeakers.com/pics/65-proto-mockup.jpg



Since all of these designs are used in current production, I think it's safe to say that there isn't a 'superior' or 'better' design. So that being said, why are there differences? What are some of the benefits and drawbacks of each design?



This is more for my curiosity (and perhaps that of others?) than anything.

There are differences primarily due to marketing. Phase plugs on high frequency drivers and vents on low frequency drivers may help a little, but you will probably not be able to hear the differences in normal listening.