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Multi-Way Conventional loudspeakers with crossovers

Cylindrical Speakers
Cylindrical Speakers
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Old 7th October 2005, 01:46 PM   #11
JohnL is offline JohnL  United States
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Hello Rademachers

That's a very nice design. Did you laminate mulitple sheets of 1/4" birch ply for the skin? If you did, could you please tell me what type of glue you used for the lamination.

It seems like everyone in your part of the world are born master woodworkers, very well done.

John
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Old 7th October 2005, 02:23 PM   #12
steve is offline steve  United States
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Hi..

I've previously posted a picture of the 'sewer pipe' speakers..

It's located at:
http://www.diyaudio.com/forums/attac...amp=1078422560

it's in a reply to 'PVC for sonotube!!!!! help Experts' in the subwoofer forum...

And no, I didn't mean to implie that it was a 'terrible awful experience'... to build them, but it was a trial...

But I'm listening to them right now... and they still make me smile... and thats what really counts...

take care
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Old 7th October 2005, 05:50 PM   #13
rcavictim is offline rcavictim  Canada
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Steve,

Those speakers look really good! Good match for modern furniture.

Rob
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Old 7th October 2005, 09:54 PM   #14
Rademakers is offline Rademakers  Netherlands
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Quote:
If you did, could you please tell me what type of glue you used for the lamination.
In this case I used Fuma because of it's lightweight. I however do glue birch ply from time to time in cilindrical shapes. In all the cases (including the Fuma) I use the regular PVA wood glue (is that the same as Elmers glue?).

However you should do the proces of glue-ing a layer in several smaller steps (on this project I did 8 inches/step), or use staples or screws to fixate each step and continue right away. Always use a piece of wood to even the pressure (on the ends) over the total length of the material.

Something like this: http://www.speakerplans.com/index.php?id=vit1

Wkr Johan
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Old 24th February 2010, 05:50 PM   #15
martinhsl68hw is offline martinhsl68hw
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I've a pair of the Rogers JL149s - they sound great, and they look wonderful
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Old 2nd December 2017, 11:21 AM   #16
Vortex is offline Vortex  Hungary
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Dear all, planning a cylindrical sub like these with a 18" driver. Front facing..

How do I calculate baffle length and rear port length/diameter to achieve a certain tuning freq ? Are there any calculators for cylindrical boxes ?

Click the image to open in full size.
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Old 4th December 2017, 04:50 AM   #17
GringoAudio is offline GringoAudio  Canada
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Default Harry Olson says no to cylinders

http://www.aes.org/aeshc/pdf/how.the...enclosures.pdf

When I see speaker like this I just know the designer had no idea what they are doing. They are clearly just ‘art furniture’ designers.
Harry Olson’s work on diffraction in the article to which the link above will take you to explains why.
Since it’s only a sub the diffraction issues shouldn’t apply though.

Box volume is all that matters in ported box design. Shape doesn’t. Use the T/S parameters from the speaker spec sheet in any readily available on line box calculator to get the box volume required and port size and lengths as well.
Cylinder volume is ‘area times length’.... or Pi times radius times radius times length.

Last edited by GringoAudio; 4th December 2017 at 04:52 AM.
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Old 4th December 2017, 05:24 AM   #18
planet10 is offline planet10  Canada
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Cylindrical Speakers
Quote:
Harry Olson says no to cylinders


Doesn’t make any difference with a subwoofer (as per the resurrectors post) since it is always radiating below the bafflestep.

dave
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Old 4th December 2017, 05:29 AM   #19
planet10 is offline planet10  Canada
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Cylindrical Speakers
I don’t know how i missed this thread.

Laying Pipe with Audio Lego

Click the image to open in full size.

the toobs Mk 1

Click the image to open in full size.

dave
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Old 4th December 2017, 05:38 AM   #20
DonVK is offline DonVK  Canada
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... possibly

Olson did great work, but his experiment used a custom 7/8" driver on a 24" dia circular baffle. This clearly caused a lot of diffraction using a high ratio of baffle to driver dia.

Linkwitz did some more tests, varying the baffle diameter, and it seems the larger the ratio the worse the diffraction. Diffraction from baffle edges He uses a cylinder in his LXMini but keeps the baffle diameters ratio small like the previous photo(s).

Vance Dickason also took Olson's work a little further and tried the driver on the side of the cylinder and found diffraction was nearly as low as a sphere or egg shape. It's in his 7th ed Loudspeaker Design Cookbook, tables on pg107, and graphs on pg111 .

Last edited by DonVK; 4th December 2017 at 05:46 AM. Reason: photos
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