Summer Project - Replication of MBL loudspeaker 101mkII - Page 5 - diyAudio
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Old 5th May 2013, 03:26 AM   #41
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Default Frequency graph

Here is the frequency response graph. The measurement was indoors and taken at 1 meter. The graph seems good within 300 - 2khz. I will be paying close attention to bring the upper frequency up in the newer models.
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File Type: jpg fr neo.jpg (93.8 KB, 407 views)

Last edited by Magnasanti; 5th May 2013 at 03:39 AM.
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Old 5th May 2013, 07:45 PM   #42
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Default Frequency graph 2

I have ran my first experiment. The graph shows the frequency response for a new sealing material. I will be doing a total of 5 experiments dealing with the sealing material and will update as soon as i measure it. The graph seems to extend well into 4khz, where as the previous model extended to 2khz.
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File Type: jpg Frequency response 5 neo1.jpg (92.8 KB, 384 views)
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Old 6th May 2013, 05:10 AM   #43
a.wayne is offline a.wayne  United States
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Good looking results , i would favor the 1st graph if wanting to use first order x overs , it would be easier to voice than the second setup..
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Old 6th May 2013, 05:12 AM   #44
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by Magnasanti View Post
I have semi finished version 1.0. On the previous video filler, and tension rods had not been installed. The sound is much cleaner. The sound is a lot more focused without the tinny and hard sound of the previous video. The clone was recorded using an omni mic.

Link to video
223 - YouTube

New pictures of "completed rev 1.0".
Cant view the videos .......
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Old 6th May 2013, 10:36 AM   #45
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Default hermetical or not?

Hi Magnasanti
I'm still on design phase. The voice coil should be 2 inches, and the lamelas will be made of fiberglass.
The idea is not to make individual petals but a single piece of a curved sheet with vertical cuts to get the spherical form.
But I still haven't clear if the sound came out only by the lamelas, and then the sphere is not hermetical, or the lamelas must be sealed inside of the gaps to increase the sensibility.
Sorry if it sounds confussing, but my english is not that good..

Good looking results, the graphics seems promising.

I can't see the videos btw.
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Old 6th May 2013, 10:59 AM   #46
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Default Karellan and A.wayne

Hello. Yes I am pleased with the graphs for being my first speaker and a difficult one at that. I could guide you on you unique rendition if need be. Yes the increased surface area should work out quite nicely if made correctly. The inside must be sealed from the outside to increase sensitivity and unwanted noise. Could you mail me some models? So that I can better understand your design? I will fix the video and update the link.
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Old 12th May 2013, 11:20 AM   #47
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Default Download Link

I could not fix the link since YouTube will take it down. The best option was to upload it to a file sharing site. Here is the link for those of you that are interested. I would recommend it to anyone who wants an idea of what my clone sounds like.

223.wmv
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Old 11th June 2013, 09:21 AM   #48
amsci99 is offline amsci99  Singapore
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Some years back I picked up a copy of the Japanese magazine, 'Stereo Sound' from the mid 80s from a used book store and was surprised to learn that the radialstrahler design was available as far back the early 80s as the MBL 100 and subsequently the MBL 101. I attach some pics which show a copious use of copper on the lamellars before the advent of carbon fibre.
Attached Images
File Type: jpg mbl 101-U4.jpg (175.4 KB, 266 views)
File Type: jpg mbl 101-U7.jpg (157.5 KB, 259 views)
File Type: jpg mbl 101-U8.jpg (141.3 KB, 248 views)
File Type: jpg mbl 101-U1.jpg (165.3 KB, 79 views)
File Type: jpg mbl 101Crossover2.jpg (84.5 KB, 80 views)
File Type: jpg mbl 100-Construct.jpg (98.3 KB, 86 views)
File Type: jpg mbl 100.jpg (223.3 KB, 72 views)
File Type: jpg mbl 101-U12.jpg (149.2 KB, 75 views)
File Type: jpg mbl 101-U16.jpg (171.2 KB, 83 views)
File Type: jpg mbl 101-U17.jpg (136.6 KB, 65 views)
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Old 11th June 2013, 09:16 PM   #49
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Thanks Amci99,
Very interesting pictures I have not seen before. There is so much of a difference between these 101 and 101mkii it is amazing how mbl keeps on finding improvements! I have not updated since I am waiting on the new sealing material to arrive it had to be "special ordered" and will take 2 months for them to even begin to ship it.
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Old 16th June 2013, 03:21 PM   #50
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Default more pics

Quote:
Originally Posted by amsci99 View Post
Some years back I picked up a copy of the Japanese magazine, 'Stereo Sound' from the mid 80s from a used book store and was surprised to learn that the radialstrahler design was available as far back the early 80s as the MBL 100 and subsequently the MBL 101. I attach some pics which show a copious use of copper on the lamellars before the advent of carbon fibre.
yes, the radialstrahler are with us since a very long time...
I'ts interesting that the first model have the mid speaker under the mid bass unit...

I've also included some render images from this site: radialstrahler mbl 101e mkii 3d model
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