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Old 9th February 2006, 09:26 AM   #11
Vikash is offline Vikash  United Kingdom
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Ahh, but we're not talking enclosure here. Simply the effects of driver cone shape.
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Old 9th February 2006, 03:18 PM   #12
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HI

Sorry if I was a bit off beam although cabinet shapes have their place !
Ok if the topic is on Driver shapes; in the lower registers we have
drivers like the KEF b139 classic and in the bass/mid registers those Japanese FAL units that Peter Daniel is checking out. Horses for Design courses? I recall it was the Mordant Shorts that went through a oval phase and those funny French drivers that had good reviews. After owning a pair of Sheppard Audio speakers in the 70s that had replaced the B139 with a B200 Kef I would be inclined to think that in the piston driven driver arena if the design is well executed you really have to weigh up performance with other factors . Where there also some tweeters from France that had gold oval domes? Really I think the quality of construction and basket rigidity are far more important.

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Old 9th February 2006, 03:56 PM   #13
Dumbass is offline Dumbass  British Antarctic Territory
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Oval-shaped cones might distribute cone resonances over a range of frequencies, thus reducing their audibility.
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Old 9th February 2006, 05:32 PM   #14
el`Ol is offline el`Ol  Germany
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There are oval fullrange drivers from Saba that definitely don`t just work as a piston and some people prefer them over the round ones.
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Old 9th February 2006, 05:48 PM   #15
Dumbass is offline Dumbass  British Antarctic Territory
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Quote:
Originally posted by el`Ol
There are oval fullrange drivers from Saba that definitely don`t just work as a piston and some people prefer them over the round ones.
Just to clarify (I'm sure you know this), no driver works as a piston, in fact full-range cone drivers would be dead in the water if they did work as pistons. At high freqs, flexing progressively reduces the effective area and mass of the cone, which is a good thing. If the movement were truly pistonic, beaming would be laser-like and high freqs would be dull.
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Old 10th February 2006, 02:50 PM   #16
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Hi

Sorry guys very badly worded, was not referring to piston
action but to such drivers in a more figurative sense.
Although the movement of a voice coil in a gap might
be referred to as a pistonic like action! Dictionary
says metal moving closely up and down in a tube.
In a way in this case at least a half truth unless my eyes
deceive me. Underhung baskets included!
The reason was to separate the oval drivers with conventional
speaker baskets and voice coils from the
exotic near fullrange drivers such as wave bending Airfoils,
big long Ribbons and others. OK if you ran a B139 full range it would sound horrible even with huge Eq'ing. (stupid idea!) I guess oval full range drivers if designed properly would behave audably well. Wonder if anyone has done research on this and no doubt use of a baffle or box or sphere to mount said driver would
be more significant IMHO.
So back to the plot! Must watch my late night ramblings !
Have I got this right? A Loud Speaker is an orator
with a voice like a fog horn !

Life it to be savoured!

AnthonyPT
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Old 10th February 2006, 03:29 PM   #17
el`Ol is offline el`Ol  Germany
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Quote:
Originally posted by Dumbass
Just to clarify (I'm sure you know this), no driver works as a piston, in fact full-range cone drivers would be dead in the water if they did work as pistons. At high freqs, flexing progressively reduces the effective area and mass of the cone, which is a good thing. If the movement were truly pistonic, beaming would be laser-like and high freqs would be dull.

Thiel claim their ceramic membrane drivers are pistonic, and others are probably quite close to that ideal.
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