Summer Project - Replication of MBL loudspeaker 101mkII - Page 6 - diyAudio
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Old 8th August 2012, 01:51 PM   #51
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really? they have two teflon surfaces in contact with each other??
VC to pole piece?
I am incredulous.

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Old 8th August 2012, 03:52 PM   #52
el`Ol is offline el`Ol  Germany
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Look at the patents of Burton Babb.
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Old 8th August 2012, 05:09 PM   #53
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got pat #s?

and just because it is patented does not mean it is practical... of course the Jordan module driver used ferrofluid type material as the rear "bearing".

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Old 8th August 2012, 05:48 PM   #54
el`Ol is offline el`Ol  Germany
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I don't say it's the best since sliced bread, but very practical for a DIYer who needs a motor for experiments with exotic diaphragms. Polymer baskets are good for slaughtering, too.

If one stays away from the lower midrange one could also use the lower excursion and power handling DML exciters. And for the lower midrange, meanwhile I wonder whether the big melon has any other justification of existence than looking funky. One could build a coloumn speaker like RAAL does,
http://www.raal-requisite.com/pages/eternity.html
just with six fiver-coloumns, each wired in a bessel-array. Should give a point source in the disired frequency range, too, with perfectly proven driver technology.
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Old 8th August 2012, 06:55 PM   #55
el`Ol is offline el`Ol  Germany
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In the sixer-array with gap one could pack the tweeter in the middle.
A Paul Kemble web page - speaker bessel arrays.
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Old 8th August 2012, 06:58 PM   #56
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well that is another topic...

... but also, the walsh style ohm F driver worked nicely...
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Old 8th August 2012, 10:39 PM   #57
el`Ol is offline el`Ol  Germany
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I don't know the Walsh, just German Physics. IMHO also a system where for one's omni pleasure one has to accept a sound quality that doesn't correlate well with the price.
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Old 12th August 2012, 09:49 AM   #58
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The MBL has so many variables involved with the design that it literally makes my head spin just thinking about it. And all of those of variables need to be in perfect balance for the design to succeed. All of them.. It's not a loudspeaker as much as it's a literal work of art that just happens to play music accurately. A totally insane design when you think about it..

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Old 19th August 2012, 03:07 PM   #59
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I took the mbl mid apart as shown here. The left over assembly left me a nice little motor from which to work with. I built a little replica merely for fun while the actual parts arrive.
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File Type: jpg IMG056.jpg (402.9 KB, 164 views)
File Type: jpg IMG057(1).jpg (470.1 KB, 159 views)
File Type: jpg IMG058(1).jpg (363.5 KB, 159 views)
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Old 21st August 2012, 04:24 AM   #60
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Default Next steps

The next steps that will be coming in the next week are. Making a mold out of carbon fiber using a 110mm pipe that will give me the bending radius of 55mm, And cutting the parts labeled: inner-ring, outer-ring, and outer-support-rods.
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File Type: jpg SHEET.JPG (106.2 KB, 57 views)
File Type: png Mid-Range model.png (67.0 KB, 67 views)
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