35" Ribbon build - diyAudio
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Old 2nd May 2015, 06:06 AM   #1
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Default 35" Ribbon build

Hi Guys, I thought I would share some images of a build im doing for a client in South Africa. The ribbon is a 5 segment it measures 6 ohms resistance and is 18mm wide and 35" long. The client wanted a narrow baffle similar to the B & G Radia 520i. The baffle is 1.1m x 220mm wide. Iv used nylon bracing bars to try and keep the flux centred between the ribbon. My magnets are N37 3/4" x 2" x 1/4". My pole pieces are 3/4" x 3/4" solid bar (No idea how this measures on Femm) IMG-20150501-WA0014.jpg

IMG-20150501-WA0018.jpg

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IMG-20150501-WA0019.jpg

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IMG-20150501-WA0010.jpg

IMG-20150501-WA0012.jpg
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Old 2nd May 2015, 06:10 AM   #2
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2 more images.IMG-20150501-WA0002.jpg

IMG-20150501-WA0013.jpg
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Old 2nd May 2015, 12:47 PM   #3
tyu is offline tyu  United States
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Vary nice..........is the foil on bouth sides?...look to be free hanging?.......one thing I never got to hear was the two sided Apogee Stage 26" ribbon.......
I gess it would have gave more image hight....but was on mylar not capton so it could get hot an fail...but not minny did.... so I have read...........but who knows
thanks for the pic
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Old 2nd May 2015, 02:39 PM   #4
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Location: Seattle
Would you share on how you attached the magnets to the steel structure? Are they glued, or do they hold themselves in place?
Thanks
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Old 2nd May 2015, 03:24 PM   #5
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Quote:
Originally Posted by tyu View Post
Vary nice..........is the foil on bouth sides?...look to be free hanging?.......one thing I never got to hear was the two sided Apogee Stage 26" ribbon.......
I gess it would have gave more image hight....but was on mylar not capton so it could get hot an fail...but not minny did.... so I have read...........but who knows
thanks for the pic
Hi Tyu, Thanks.

The ribbon is attached every 180mm to the nylon braces.
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Old 2nd May 2015, 03:25 PM   #6
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Quote:
Originally Posted by nerdorama View Post
Would you share on how you attached the magnets to the steel structure? Are they glued, or do they hold themselves in place?
Thanks
No need for glue once they on the pole piece they wont jump towards each other.
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Old 2nd May 2015, 04:33 PM   #7
tyu is offline tyu  United States
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For give me..............but I though that had to be glued??
My point is that the apogee 26" has a open spot at the top an bottem of 1 1/2"....an that I could add magnts if I wished... ....
thay did this on later 26"ribbons to get more output?
with the magnets just holding there self.... I could see if I like the sound...if not I could just pull the magnets off......
Thanks
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Old 2nd May 2015, 05:00 PM   #8
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Tyu no Glue required.

More images..... Finished 10 hours later!!IMG-20150502-WA0004.jpg

IMG-20150502-WA0001.jpg

IMG-20150502-WA0003.jpg
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Old 2nd May 2015, 10:53 PM   #9
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Location: Seattle
Any idea of the sensitivity of the ribbons? I have some Apogee Centaur Minors and other than somewhat low sensitivity, I love the sound of the ribbons.

Thanks for sharing your project.
John
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Old 3rd May 2015, 02:45 AM   #10
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Hi John, T
Thanks they are very close to 90db they are easy to drive.

Brian
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