This site has a bunch of them and a lot of construction
detail as well.

I find the sonotubes fascinating but the Shiva subwoofer
prices daunting. Check out the 12 Shivas Dancing construct
which actually diverges into Infinite Baffle terrain.

From the site below you can even get to some heavy iron for
cars.

• Sonotube links

I just made a fresh post of the Sonotubes link page
and the other one popped into the forum.

I usually hit the refresh button when I visit a forum so I can see new posts, including my own. My browser won't automatically check to see if a web page has changed from the version stored in its cache. So I have to hit the refresh button manually.

Wayne

• http://www.klone-audio.com/

I can't really salivate over a speaker sonstruction that
can double as a load-bearing support for a house. :-)

Just too much.

But the Sonotube construct intrigues me and Bill Fitzmaurice
made mention that some sub drivers were on deal at MCM.

The Shiva costs about $130. Does Eminence or any of the
others in the 8" to maybe 10" range meet the requirements
of a sonotube? They show 2 drivers and a longish port on the
interior. And where do you put your plate amp?

I think the sonotube can be built with off the shelf
parts from Home Depot including the circular top and bottom.

A groove would have to be cut in pre-made small size
'table tops' they have to accept the tube. A 4" hole saw
can make the port cutout for either carpet roll core or
PVC.

My high school geometry tells me you need the radius
of a circle to find the center. Are there any methods I missed
which can calculate the center w/out a radius?

Alternately, here's a kit I posted some months ago from
CSS:

• Sonotube kit

How can you not salivate over the Shiva 12. I've been trying to find a site I saw some time ago on this sub that was built into the floor. I think it was an Italian audio site that showed like 24 12" subs set in a "horn" made out of stone or concrete that ran under the guy’s listening room. Pretty spectacular looking.

I think one of your earlier posts said something to the effect that sonotube-type subs were mostly for HT. Are you familiar with Hsu subs. Very similar to sonotube construction, but from everything I've read are considered "audiophile" grade, that is accurate and very musical.

Finding the center of a circle can be done by several methods:
1) Center of mass. Assuming perfectly round and uniform density, the point at which it balances is the center.
2) Also, the longest cord (a line that connects two points on a circle's circumference) passes through the center. Simply measure the longest distance across the circle and mark a line. Do this several times around the circle and the intersection of the lines should be the center (or pretty close).....Colin

The 12 Shivas Dancing is from the above link to other
sonotube links. I have simply no way of building anything
into the floor, but there is an Open Baffle site that shows
a number of these projects.

And in here, you may be able to do a search for
The World's Biggest Speaker... a project made in Italy
where a concrete form as big as a basement makes the basshorn.

Makes you all tingly, doesn't it? ;-)

Here is another sonotube which has been in the TL forum...

• Sonotube subs with Shiva

• http://www.passdiy.com/speakers.htm

here's the link to Royal Device in Italy

• World's Biggest Audio Speaker