"Oblique cone" - pros and cons?

[noah katz]

"It's the alternative solution to making the damped, spring-loaded mass intrinsically perfect. Instead, you embrace and nurture the resonances. You want an infinite number of them so that the response becomes flat because every frequency is equally resonant."

Unless the diaphragm is really low stiffness, modal density won't be high until octaves above audibility.

Elliptical should be a lot better than round from the asymmetry it gives, but it's still a lot more symmetrical than the offset cone shown.

A triangle with rounded points and the VC at the centroid ought to be pretty good, and driven from the CG won't induce rocking.

Or start with their round cone, and swell it at the VC end until the CG is at the VC.

 

[soongsc]

Fiendishly clever. On first glance the surround would appear a nightmare to design. You'd expect the driver to rock towards the large end at high excursion.

You know, I just came across one, and yes, you can hear some rubbing. I imagine it would be very difficult to totally not rock, but if it does not rub within the designed Xmax, then it actually shows it meets the original design intent when used within the piston mode frequency range.

 

[graaf]

here is a real orgy of oblique cones, JVC-Victor SX-9000:

VICTOR ƒXƒs�[ƒJ�[ƒVƒXƒeƒ€SX-9000‚ÌŽd—l ƒrƒNƒ^�[

woofer's oblique cone from Kurt Mueller, gold plated midrange and tweeter cones, all Alnico magnets, special thick brass frame for speaker mounting etc.

beauties, aren't they? 🙂

 

[graaf]

You know, I just came across one, and yes, you can hear some rubbing. I imagine it would be very difficult to totally not rock, but if it does not rub within the designed Xmax, then it actually shows it meets the original design intent when used within the piston mode frequency range.

in fact Victor claims that there is special "mass balancer" and special "suspension system" designed for oblique cones

 

[graaf]

some more eye candies

I wonder to what degree such a resonance distribution can be obtained through oblique cone coating/impregnation instead of cone structure formation.

 

[Pano]

Good grief. Thread back from the dead.

 

[phase_accurate]

I quess the elliptic voice-coils achieve the same effect wit probably less disadvantages (= need for dynamic balancing).

Regards

Charles

 

[UniQ]

I wonder how that red colored triskelion shaped suspension would add anything favorable to support the unusual cone shape, the picture isn't very clear but it looks pretty uniform, the only thing I would imagine it does is, when it moves in either direction from its rest position is it would twist ever so slightly around its center axis pulling the cone with it, isn't that a concern especially for long stroke movements?

 

[Juhazi]

ScanSpeak has launched "Ellipticor" series Ellipticor – Scan-Speak A/S

An externally hosted image should be here but it was not working when we last tested it.

Troels has some ideas ScanSpeak-Ellipticor-1

 

[chrisb]

kinda sexy in its own way, I guess - elliptical voice coils must present significant challenges during the manufacturing and assembly process, but pardon the ignorant question - what are the proposed (or proven?) advantages.

Note that the cone is still round, and isn't that where most of the cited "break-up" behaviour occurs? Then again, these guys are smarter than many of us, so ...

OTOH, the tweeter is very interesting

An externally hosted image should be here but it was not working when we last tested it.

 

[Mario Pankov]

That`s not new. I have seen such non-symmetrial drivers, mostly eliptic, even made in a local factory in Bulgaria (featuring a cobalt magnet system as well).

 

[graaf]

kinda sexy in its own way, I guess - elliptical voice coils must present significant challenges during the manufacturing and assembly process, but pardon the ignorant question - what are the proposed (or proven?) advantages.

Note that the cone is still round, and isn't that where most of the cited "break-up" behaviour occurs? Then again, these guys are smarter than many of us, so ...

measured (by those guys themselves) "break-up" behaviour of Ellipticor is only slightly better