Different look at magnet and voice coil structures - AVS Forum
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post #1 of 11 Old 07-10-2013, 11:18 AM - Thread Starter
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Check out this setup from Powersoft Audio

Here's the text from the video.

As displayed by Ken Blecher at InfoComm 2013 in this exclusive video for FRONT of HOUSE magazine's FOH-TV, Powersoft unveiled its M-Force system, a revolutionary drive system for subwoofers that uses fixed coils and moving magnets (rather than the traditional moving voice coil and stationary magnet structure). Intended for high-performance professional sound reinforcement applications, the technology will be offered to other companies as an OEM system and can be used with various types and materials of woofer cones -- a 30-inch is shown and up to 40-inch is supported.

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post #2 of 11 Old 07-10-2013, 12:00 PM
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I need two of these, in a tapped horn.
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post #3 of 11 Old 07-10-2013, 12:13 PM
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Interesting.

Internal pics and diagrams in this vid.
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post #4 of 11 Old 07-10-2013, 07:42 PM
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Very cool!
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post #5 of 11 Old 07-10-2013, 07:47 PM
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post #6 of 11 Old 07-10-2013, 08:10 PM
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that is pretty amazing. i was just thinking
of something similar early today. essentially
using "rail gun" technology to drive a subwoofer
piston.

a big advantage of moving the magnet
instead of the coil is you no longer have
to try to keep the coil light weight, so
you can have a MONSTER of a coil.

one challenge that i see is that like
the slug in a rail gun, the energy inside
it will be enormous and that might cause
problems like demagnetization of the slug.

neat post. props.

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post #7 of 11 Old 07-10-2013, 08:40 PM
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Mmmmm... , The moving iron speaker was the earliest type of electric loudspeaker.
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post #8 of 11 Old 07-10-2013, 09:07 PM
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Quote:
Originally Posted by LTD02 View Post

that is pretty amazing. i was just thinking
of something similar early today. essentially
using "rail gun" technology to drive a subwoofer
piston.

a big advantage of moving the magnet
instead of the coil is you no longer have
to try to keep the coil light weight, so
you can have a MONSTER of a coil.

one challenge that i see is that like
the slug in a rail gun, the energy inside
it will be enormous and that might cause
problems like demagnetization of the slug.

neat post. props.

Definitely. This is some motor technology I'd see like to see more of in the near future.

The Servodrive Contrabass comes to mind. Although that was different tech altogether. Belt driven, iirc.

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post #9 of 11 Old 07-11-2013, 06:35 AM
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They have been working on this for 5 years if not longer...Yes the stationary coil moving magnet system is not new by any means. However they are doing some more advanced things in this design that haven't been done to my knowledge. Multiple gaps, magnetic centering, magnetic limiting, etc. I dont think we will see this on anything that isn't a finished system costing VERY big money for quite some time. Hopefully I am wrong.
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post #10 of 11 Old 07-11-2013, 07:46 AM
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Quote:
Originally Posted by Ricci View Post

I dont think we will see this on anything that isn't a finished system costing VERY big money for quite some time.
Chances are it will never be seen on anything smaller than an 18 either. Even if the magnet is a 10oz neo that's a lot of weight added to the MMS of a typical driver. It would have to be insignificant to be worthwhile, thus using it now in a 30 incher. Even then it's going to cost a fair bit of sensitivity, but that's overcome by not having to keep the coil gauge small, allowing a lot more power than a moving coil driver. It looks like they're heat-sinking the coil too, allowing even more juice. As for price, chances are these will be mainly pro-touring sound oriented, where paying $5k and more per sub isn't blinked at, and the space savings offered compared to other options can save in diesel fuel in one season what they pay for the speakers.

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post #11 of 11 Old 07-11-2013, 08:27 AM
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30 inch by 3 inch P-P excursion = ~34 liters? I think 4 should do it. Sealed box dimensions sound workable as well.
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