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Old 19th February 2013, 06:03 PM   #1321
xrk971 is online now xrk971  United States
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They have 12 mm or half in thick paper-foam-paper foam core in the US too but kind of pricey.

40 x 60" White Foamboard S-13721 - Uline
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Old 19th February 2013, 06:10 PM   #1322
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Thanks, I followed the link to the catalog page. 25 sheets for $18 - am I reading that right?

I could build a half dozen Klisphorns with that.

Still like to find something with the multiple layers.
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Last edited by bcmbob; 19th February 2013 at 06:13 PM.
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Old 19th February 2013, 06:11 PM   #1323
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Quote:
Originally Posted by MrMag2001 View Post

Among other things, that the speaker did not fit, so I had to build a small box behind the magnet. Wait that was not really my fault i guess.
Maybe you can use the curved inner divider trick that I used when building my Flat BIB (FIB). Score the paper on the driver side of the divider - enough to pierce the paper with closely space lines parallel to bend direction. Glue the portion of the divider at the top and a couple inches down with hot melt. Then bend the divider in a smooth arc enough to make room for driver and slowly glue sections of the curved divider at a time. You will end up with a slightly different horn profile which is now parabolic to exponential. It should sound about the same, the tuning freq may shift slightly higher due to exponential opening versus conical opening. Anyhow, you solved it with a box - nice.

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Old 19th February 2013, 06:12 PM   #1324
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by bcmbob View Post
Thanks, I followed the link to the catalog page. 25 sheets for $18 - am I reading that right?

I could build a half dozen Klisphorns with that.

Still like to find something with the multiple layers.
I wish. Minimum order of 25 at $15 per sheet!
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Old 19th February 2013, 06:23 PM   #1325
bcmbob is offline bcmbob  United States
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Still tempting for someone with a serious addiction to foam.

Klisphorn Build A.

Klisphorn Build B

Plans

The Real Thing!

$375 vs. $4,500.00 hummmmm
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Last edited by bcmbob; 19th February 2013 at 06:27 PM.
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Old 19th February 2013, 06:29 PM   #1326
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Bcmbob,
I see your point. Building those horns in wood looks like a real pain in the a**. I can imagine how much easier if one could just cut all those edges with a box cutter and straight edge and glue together with tacks of hot melt and seal with PVA. Hardly any clamping would be needed. There is no denying the fun you would have, not to mention, some decent sounding speakers for a mere $375!
Hope you go for it!
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Old 19th February 2013, 06:33 PM   #1327
bcmbob is offline bcmbob  United States
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I actually built one with wood back in the 60s. (Just the bottom). When I plugged it in, it blew the door to my daughters bedroom wide open. Just used a cheap generic driver and never could afford the top end horn (student w/ two little ones). Might try again this summer with foam.

When I brought this one home the WAF said
"No Way" , grabbed the kids and left for her mothers house.
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Last edited by bcmbob; 19th February 2013 at 06:57 PM.
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Old 19th February 2013, 07:15 PM   #1328
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Quote:
Originally Posted by xrk971 View Post
They have 12 mm or half in thick paper-foam-paper foam core in the US too but kind of pricey.

40 x 60" White Foamboard S-13721 - Uline
Hmmmm... One could use these 48 x 96" Black Foamboard S-13724 - Uline

...to build a pair of black Silburys.

EDIT: Wait a minute... $53 EACH! I thought that was for 12 of them!

Baltic Birch is only about 20% more and it is "the real thing".

Last edited by cogitech; 19th February 2013 at 07:18 PM.
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Old 19th February 2013, 07:28 PM   #1329
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Quote:
Originally Posted by cogitech View Post
Hmmmm... One could use these 48 x 96" Black Foamboard S-13724 - Uline

...to build a pair of black Silburys.

EDIT: Wait a minute... $53 EACH! I thought that was for 12 of them!

Baltic Birch is only about 20% more and it is "the real thing".
Yes it is the real thing, but perhaps the big difference is that BB can't be cut with a boxcutter in your dining room and makes lots of sawdust. For those of us without a workshop, it is the only means of making a DIY speaker. Oh, and the final product can be lifted with one hand It isn't for everyone, but for those who have tried it, are usually surprised by how good it sounds, and how fast and easy it was to build. As Mag said, it took him a little more than an hour for those cool BIB's. That is record fast in DIY speaker land! (except for my 10 minute OB project - but that is not a real speaker... )
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Old 19th February 2013, 07:43 PM   #1330
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I understand the attraction, which is why I am reading the thread and looking at the foam core boards.

I just had no idea how ridiculous the prices can get.

I will build something in foam core, for sure, but it will not be Silburys! It will need to be limited to whatever size they sell at the dollar store.
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