I feel like I'm fishing in a swimming pool.....
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Indeed different speakers have different tonal (harmonic) qualities because of different cone materials. It's like the old 'paper vs plastic' cone debate, of course they sound different most of the time, but I would be willing to bet that with enough hard (and useless) work, you could make one sound like the other.
Remember - Rigidity, damping and mass.
Remember - Rigidity, damping and mass.
you are saying we want high or low density for good damping dave ? Ive honestly never heard of a speaker cone that resonated in the audible range... seems anything common has high enough rigidity that resonance is well over 20khz...
Anyway, yea sux pyramids are 3/4 triangles put together.. lol.. and yes I feel they are a stronger structure then an arc..
I see a flat cone with triangular supports or a isogrid panel as being stronger...
guess I should have taken 1st year geometry in uni so I could say for sure... [img]graemlins/laugh.gif[/img]
[ November 09, 2004, 01:47 AM: Message edited by: Haunz ]
Anyway, yea sux pyramids are 3/4 triangles put together.. lol.. and yes I feel they are a stronger structure then an arc..
I see a flat cone with triangular supports or a isogrid panel as being stronger...
guess I should have taken 1st year geometry in uni so I could say for sure... [img]graemlins/laugh.gif[/img]
[ November 09, 2004, 01:47 AM: Message edited by: Haunz ]
50 Watt CAFz'r
Joined: Oct 2003
Posts: 146
Originally posted by Dave_MacKinnon:
Remember - Rigidity, damping and mass.
Remember - Rigidity, damping and mass.
It's like modeling a speaker's output anechoically and expecting it to be the same in-room.
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Hobbes26
Damping reduces resonance.
Regidity raises the frequency of those resonances out of the desired operating range.
I can't say that I've seen lots of cones with resonance problems, but I have definitely seen speaker assemblies with them, ran in to one last night in-fact.
Haunz - The absolute density is relative to the design of the driver and has more to do with mass than damping.
it would be interesting to model the dynamic behaviour of a well-supported flat panel as compared to a well-designed cone.. However, I don't have, or know how to use that kind of software accurately.
As for cone resonances, most woofers have them, and they are definitely in the audible range. I know the PPI Pro 10 had it's first resonance just over 1000Hz, which supports your flatp-panel theory.
Damping reduces resonance.
Regidity raises the frequency of those resonances out of the desired operating range.
I can't say that I've seen lots of cones with resonance problems, but I have definitely seen speaker assemblies with them, ran in to one last night in-fact.
Haunz - The absolute density is relative to the design of the driver and has more to do with mass than damping.
it would be interesting to model the dynamic behaviour of a well-supported flat panel as compared to a well-designed cone.. However, I don't have, or know how to use that kind of software accurately.
As for cone resonances, most woofers have them, and they are definitely in the audible range. I know the PPI Pro 10 had it's first resonance just over 1000Hz, which supports your flatp-panel theory.
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I have to agree with SUX, I like rigid... I have a Focal 33KX right here for testing, and this cone is farging awesome in terms of stiffness... The rest of the woofer is just damn cool! I should have it in the car by the end of the day...
Anyways...
Just to throw a huge wrench into your thought process, I was talking with a speaker manufacturer the other day, and they carry a series of oblique cone drivers. Imagine a round driver, say a 6.5-inch, that has the motor structure shifted about 3/4 of an inch from center - kind of like a 5x7 mated to a 6.5...
The purpose of the design is to eliminate cone resonance and it works quite well from what I understand. I think Precision Power or Orion or somebody like that has one in their product line.
Anyways...
Just to throw a huge wrench into your thought process, I was talking with a speaker manufacturer the other day, and they carry a series of oblique cone drivers. Imagine a round driver, say a 6.5-inch, that has the motor structure shifted about 3/4 of an inch from center - kind of like a 5x7 mated to a 6.5...
The purpose of the design is to eliminate cone resonance and it works quite well from what I understand. I think Precision Power or Orion or somebody like that has one in their product line.
1000 Watt CAFz'r
Joined: May 2002
Posts: 1,649
The next big thing will be a flat, square speaker with ripples in it............ and the cone material will be a hi-tech composite of dirt and wood glue.
[img]graemlins/bow.gif[/img]
Oh yeah, it will have chrome and little lites on the basket too.
[img]graemlins/2xblown.gif[/img]
Dukk, was wondering if you may have a spare $50K USD for me to use to develop this driver ??? It's gonna kill in the 2005 market. Hoping to release secretly at CES 2005. A completely [img]graemlins/cf2.gif[/img] product to revolutionize the market.
[ November 08, 2004, 12:25 PM: Message edited by: dawgsbreakfast ]
[img]graemlins/bow.gif[/img]
Oh yeah, it will have chrome and little lites on the basket too.
[img]graemlins/2xblown.gif[/img]
Dukk, was wondering if you may have a spare $50K USD for me to use to develop this driver ??? It's gonna kill in the 2005 market. Hoping to release secretly at CES 2005. A completely [img]graemlins/cf2.gif[/img] product to revolutionize the market.
[ November 08, 2004, 12:25 PM: Message edited by: dawgsbreakfast ]
