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Bertha BH-882 Build

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UpComingSound View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote UpComingSound Quote  Post ReplyReply Direct Link To This Post Posted: 28 October 2016 at 12:47pm
so the single berthas would not be a good choice for mobile to have 4 of them compared to scoops or some other horn loaded cabinets ?
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Lee In Montreal View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lee In Montreal Quote  Post ReplyReply Direct Link To This Post Posted: 28 October 2016 at 3:11pm
These Bertha's/Levan horns serve a different purpose than scoops. Look at most installations. Berthas + scoops on top for kick and upper bass. I suggest you build one and hear by yourself what you prefer. 

BTW This is a Waldorf on top of the Bertha in the picture, not a JBL 4520.






Edited by Lee In Montreal - 28 October 2016 at 3:18pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote UpComingSound Quote  Post ReplyReply Direct Link To This Post Posted: 31 October 2016 at 7:56pm
Here go some Berthas outside of met life center I believe DJs were the world famous disco twins from nyc   https://www.youtube.com/watch?v=xkhFbsAdQ0k

Edited by UpComingSound - 31 October 2016 at 8:01pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote parabox Quote  Post ReplyReply Direct Link To This Post Posted: 26 February 2017 at 7:35am
im somewhat intrested

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Post Options Post Options   Thanks (0) Thanks(0)   Quote BP1Fanatic Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2022 at 11:09am
Still a classic thread just like the enclosure!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 22 April 2022 at 4:43am
Bertha......A+.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zitikaz Quote  Post ReplyReply Direct Link To This Post Posted: 28 December 2022 at 10:20am
Hei

HELP NEEDED!

Can someone help me to scale it up a bit, to fit 21LW1400 and simulate it in hornresp?
Plan is to build these monsters with 21" drivers :)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zitikaz Quote  Post ReplyReply Direct Link To This Post Posted: 28 December 2022 at 10:21am
Originally posted by Lee In Montreal Lee In Montreal wrote:

Originally posted by nomercy82 nomercy82 wrote:

Post pictures when you're done. I'm curious about your design. How does a 1 foot extension of horn length make up for a 3 foot hyperbolic extension?


Like that. With a 36" deep extension, it makes it "theorically" a 21Hz horn once the back chamber and throat size are tuned for a JBL 2242. Without the extension, it is a 27Hz horn for a 1/4 wave. Theorically. ;-)



How was the real results?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 29 December 2022 at 11:43am
Bertha Hints - Make sure all internal Joints are Air tight.....I coated all Joints with Epoxy after building the Horn....A small Air leak will reduce Bass Output.....Make sure to get rear door very tight....The Klipsch Audio Papers has a Paper were Klipsch writes about Air Leaks....I found I like the Sound of two 1/2 Berthas better than one dual 18 Bertha......1/2 Berthas are also a lot less work moving.....VECTORSONICS
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Post Options Post Options   Thanks (0) Thanks(0)   Quote APC321 Quote  Post ReplyReply Direct Link To This Post Posted: 29 December 2022 at 7:51pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zitikaz Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2023 at 11:29am
Can someone help me to scale up drawings so i can use 21" driver?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Twintub Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2023 at 12:14am
21"/18" = 1.1667
Multiply all dimensions by 1.1667Smile
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