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Old 23rd June 2013, 10:42 AM   #1
el`Ol is offline el`Ol  Germany
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Default building one's own diaphragm

Hello all!

I want to try a new diaphragm type for fullrange drivers and and don't want to care much about the rest. As far as I understand it Lowther basis would be convenient because spider and surround are constructed for easy replacement. Easy only for professionals, or also for diyers? And is there a cheaper solution?

Oliver
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Old 23rd June 2013, 11:22 AM   #2
Frank40 is offline Frank40  Denmark
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Hi el'Ol, Try to take a look at this thread, you have to go a bit back in the thread. Hope this helps.

Take care

Project Ryu - DIY Field Coil Loudspeaker
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Old 23rd June 2013, 11:27 AM   #3
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Depends on exactly what you're doing. If you want quality performance, then the cone of the drive unit: the physical profile, mass, stiffness, micro-resonant behaviour & self-damping properties should be inherently linked to the suspension and motor design. Just slapping any old thing onto an existing unit (not suggesting that's what you're doing) isn't likely to bring good results, or provide much data worth having.
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Old 23rd June 2013, 12:00 PM   #4
el`Ol is offline el`Ol  Germany
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Thanks!

Maybe I should cooperate whith the field coil guys to see what mechanical damping of the suspension and what driving force harmonizes best with the diaphragm. Also I'm not sure how easy is it to source the materials as a DIYer, maybe some help concerning this would also be helpful.
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Old 14th July 2013, 03:06 PM   #5
el`Ol is offline el`Ol  Germany
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The Driver is running now, based on a little Lowther. Subjectively full 180 dispersion, only moderate change with position (in a small, normally furnitured room).
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Old 15th July 2013, 10:18 AM   #6
xrk971 is online now xrk971  United States
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Photos? Measurements?
Thanks
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Old 15th July 2013, 01:00 PM   #7
el`Ol is offline el`Ol  Germany
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Here are the plots from 0 to 90 (driver in open baffle). Sorry for not knowing how to integrate them in ARTA.
Before I upload pictures I first figure out whether there is a demand for something like that in the architectural installation market. But this is probably a field where it is much harder to earn money than in exotic hifi.
Attached Images
File Type: jpg low00.jpg (142.9 KB, 320 views)
File Type: jpg low15.jpg (141.4 KB, 312 views)
File Type: jpg low30.jpg (142.3 KB, 312 views)
File Type: jpg low45.jpg (142.7 KB, 311 views)
File Type: jpg low60.jpg (143.4 KB, 304 views)
File Type: jpg low75.jpg (143.1 KB, 46 views)
File Type: jpg low90.jpg (144.4 KB, 49 views)
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Old 17th July 2013, 02:00 PM   #8
el`Ol is offline el`Ol  Germany
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Removed the main diaphragm, leaving only what I thought would be the tweeter section. Result: The aggressive pro sound is gone, speech intelligibility is far better, and the bump differs less between on axis and off-axis. Now I'll design a notch and listen again. The big Lowther voice coil gives clean sound at levels one would never expect from a micro-fullrange driver. Seems that I am in the center of the mass market now. Bad for a nobody.
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Old 20th August 2013, 04:57 PM   #9
el`Ol is offline el`Ol  Germany
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Here are the measurements of the current version:
Sadly the sound is very much on the aggressive side again. Meanwhile I tested the BMR, a fullrange driver developed by NXT that is also developed for ultra-wide dispersion. I would describe its sound character as the other extreme, kind of an easy-listening driver.
Attached Images
File Type: jpg rad00.jpg (140.2 KB, 42 views)
File Type: jpg rad15.jpg (140.1 KB, 40 views)
File Type: jpg rad30.jpg (139.6 KB, 25 views)
File Type: jpg rad45.jpg (139.6 KB, 22 views)
File Type: jpg rad60.jpg (139.6 KB, 20 views)
File Type: jpg rad75.jpg (140.2 KB, 18 views)
File Type: jpg rad90.jpg (137.7 KB, 21 views)
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Old 20th August 2013, 05:43 PM   #10
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Are these free field measurements? Is this 0-90 in 15 increments? How far from the baffle was the mic placed?
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