Driver design

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#6
thanks for the links and info guys, i will definitely look into it. i thought that there wouldn't be many people here with in depth knowledge of driver design but looks like i was wrong.

why would i want to design a driver? well, it just amazes me how a few basic components can make such different results and i want to find which claims by those manufacturers are even remotely true.

for example, does a minimal rear basket really reduce reflections? i don't know. i probably can't try this out because i can't custom make moulded plastic or metal parts. but i'll try the most i can do.

anyway, thanks again, and if you guys got any more ideas, keep posting!
 
#7
auriches said:
...why would i want to design a driver? well, it just amazes me how a few basic components can make such different results and i want to find which claims by those manufacturers are even remotely true...
Click to expand...

That would take a lot of work. If you're looking to build a nice sounding speaker system you're better off using existing drivers that are well reviewed and tested - others have already done your work for you. Nothing personal but your chances of coming up with something comparable to good existing drivers is not very good.
 
#8
auriches said:
....

for example, does a minimal rear basket really reduce reflections? i don't know. i probably can't try this out because i can't custom make moulded plastic or metal parts. but i'll try the most i can do

....
Click to expand...


You may try this in the other way round by treating a pressed steel frame which comes with large flat 'spokes'.

Some wool felt or the likes applied on the inner side of that basket can absorb some of the mid-high frequncy reflection. You may hear and measure this effect (especially on those wide range drivers).

OK, this might not be a 'direct' evidence to <a minimal rear basket really reduce reflections>, but pretty much, I think. (I haven't tried modifying midbass or woofers in such way, though.... )

So, maybe there're already many things to by modifying existing drivers before designing a new one from scratch.
 
#9
CLS said:



You may try this in the other way round by treating a pressed steel frame which comes with large flat 'spokes'.

Some wool felt or the likes applied on the inner side of that basket can absorb some of the mid-high frequncy reflection. You may hear and measure this effect (especially on those wide range drivers).

OK, this might not be a 'direct' evidence to <a minimal rear basket really reduce reflections>, but pretty much, I think. (I haven't tried modifying midbass or woofers in such way, though.... )

So, maybe there're already many things to by modifying existing drivers before designing a new one from scratch.
Click to expand...


commonly the basket frame is made of hard reflective material (steel or whatever), and i would therefore need to add that type of material to the back of existing drivers to test. if i added any absorptive material it would most definitely affect the mids/treble.
 
#10
Oh! Yes, of course. I just didn't think of that 😱

OK, let's drop that basket 'issue', since it's relatively 'easy' compared to other problems, like cone composition/profile, suspension(s), and the most important (I think) -- the motor.

Maybe it's a good start by studying the works of AE, 18sound, Steallus... etc. Wait, am I repeating what sdclc126 just said?
 
#11
As others have said, STEALLUS is interesting:
http://www.audioxpress.com/magsdirx/voxcoil/addenda/media/mowry1107.pdf
http://www.audioxpress.com/magsdirx/voxcoil/addenda/media/mowry108.pdf


This came up recently in a thread here and is worth mention:
http://www.diycable.com/main/pdf/WooferSpeed.pdf


I haven't bought it/read it yet but I've heard that this is a good reference:
http://www.gedlee.com/Audio_trans.htm


I'm sure you've seen the new ScanSpeak Illuminator woofer. It's frame is one of the most open designs possible and seems like it will be influential in that regard considering what the new upcoming Vifa drivers look like.


As for actually building your own tester drivers you could just modify existing ones since you aren't able to cast or machine your own custom frames/baskets. You could cut the legs and stock motor completely off a cast frame driver right where they meet the front cast ring with the mounting holes. You'd then have a round base ring and using readily available metal shapes like maybe 8mm rod and 4mm plate, aluminum or maybe brass, and a little creativity with some basic hand tools you could fab a new basket to hold your own custom motor as well as different cones/spiders/surrounds. Something like a DIY version of the Skaaning SK300-304 frame is what I envision: http://www.madisound.com/pdf/skaaning.pdf
 
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