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Old 3rd November 2006, 05:31 PM   #11
Consul is offline Consul  United States
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I still have to decide if the plans are worth $10 or not. I'm thinking, probably not, at this point. The other side of the coin, though, is what is he not telling us here that is in the plans? There might be a really nifty trick we're overlooking.

Is it worth $10 to find out?
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Old 3rd November 2006, 05:45 PM   #12
SY is offline SY  United States
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"This way to the Egress!"
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Old 3rd November 2006, 05:51 PM   #13
Consul is offline Consul  United States
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Did I do something wrong?
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Old 3rd November 2006, 05:53 PM   #14
john65b is offline john65b  United States
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I have built a similar speakers for my computer that works in the same way... using those transducer speakers that stick on the wall/table/carboard box/anything flat. They turn anything into a vibrating speaker - I think they are made by Sonic Impact - yes the Tripath Sonic Impact -

Anyway, I slung some thin mylar (actually, an old Sepia engineering drawing from work) over a basic 12" x 8" picture frame and stapled it tight around the edges. Then I simply stuck one of those vibrating speakers on the lower half and Violla, Poor Man's Maggies.

Sounded OK (not close to my Magnepan MMG's, tho), but I noticed the sound got much better/clearer when I stretched to mylar tighter over the picture frame.

Maybe I will resurect that project someday...
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Old 3rd November 2006, 09:23 PM   #15
torzsok is offline torzsok  Hungary
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Does anybody have a guess what this mylar is called in Europe?
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Old 3rd November 2006, 09:40 PM   #16
SY is offline SY  United States
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Mylar is a brand name for PET from Dupont. It's still called Mylar in Europe. There are other brands, notably Melinex.

Consul, no problem, I was just making a (rather lame) Barnum joke.
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Old 3rd November 2006, 10:00 PM   #17
Consul is offline Consul  United States
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Yes, I know. There's a sucker born every minute.

I guess that means I'm passing on this design.
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Old 3rd November 2006, 10:02 PM   #18
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Default Given the drive system...

I can't really see that what film that you might choose to use will make a whole lot of difference. I would suggest that you find the thinnest plastic wrap that you can at your grocery store and use that. The high frequency comming off the back pole piece vent of a speaker is not in all likelyhood going to be very extended (or clean) so super thin film is not going to buy you anything. Further this is a neumatic system so film mass is nt going to be an issue either as it would in an ESL. It would be best (my guess) that you keep the volume between your two sections of film equal to or smaller than that of the volume of air in the pole piece vent. Make sure that the system is air tight (no leaks). Thinner film would make for better bass but don't get your hopes up.
You could also construct one of these using a plastic pipe section say 1 " dia with a vertical slot opening on each side about a 3/8 inch wide. Fit with an internal solid dowel to fill most all of the volume and tape your diaphragm film over each vertical slot. Cap off one end of the pipe and fix the other end to your driver.
Some of those small long throw Aura drivers like the kind used in computer and ipod speakers would work well as they have long throw. That way you would not be listening to the resonance off the back side of a cone driver. I cannot see that your money would be well spent on what ever design info that Steve has to offer regarding this idea. Just play with it first and see what you think. There are no magic secrets regarding this thing. I expect it will be a fun experiment but don't expect to have a world beater with this idea. At ten bucks per set of plans it's a great idea ...for Steve. Regards Moray James.
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Old 3rd November 2006, 10:04 PM   #19
SY is offline SY  United States
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Mmm, didn't mean to imply that this is a ripoff, merely that it's marketed well- your comment about hoping that some cool trick is in there is proof. Now maybe there is something cool, and if so, the $10 is well-spent. But if I were to bet, the "plans" will be pretty straightforward.
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Old 3rd November 2006, 10:55 PM   #20
Consul is offline Consul  United States
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Well, as someone new to loudspeaker DIY, that's why I ask these kinds of questions.

Thanks for the ideas, Moray. I'll try playing around with it and see what I come up with. Thank you to everyone else for keeping me from wasting $10.
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