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Jef Nuyts 2nd January 2013 08:30 AM

Electro-magnetic damping

Maybe you guys can help me on this. I have made a driver (that really works on this moment) with a adjustable magnetic damping system. But I have a problem on this. I use a surround and spider to center the cone and voicecoil. When i reverse the current in the damping coil i can loosen up the damping or in normal direction i can tighten the damping. My question... I wan't to eleminate the spider and maybe the surround because the magnetic damping is 100% lineair over the whole range. Good spiders also over 80% but most surrounds not. The problem is to magnetic center the whole coil without a spider. I tried differtent things but without succes.
I read a post that said with no surround or spider the whole thing wil keep ringing. Maybe it is better to eleminate the spider and keep the surround? Wich one is better rubber or foam? Where can i find some lineair surrounds for 8" drivers? Thx for your help

JMFahey 2nd January 2013 12:41 PM

I don't think that you can fully eliminate suspension and surrounding and have the cone "float" in the proper position magnetically.

Jef Nuyts 2nd January 2013 07:16 PM

I think maybe ferrofluid is a solution? In combination with electromagnetic damping. No ringing because of the fluid damping caracteristics?

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