November 11, 2006


I picked up some 20" diameter Sonotube round concrete forms, in 4' lengths, from Westside Concrete Materials today. They are one of the few concrete supply companies in the area that is open on Saturday, although they're only open for a few hours. I'd originally tried arranging for purchase and delivery with Muller Construction Supply, but after two days where they twice promised to return my call but did not, I decided to look for a different supplier. The two guys I talked to at Westside were very friendly and helpful, and I was able to fit both sections in the Beetle although it was a tight fit.

I'm going to use these round forms for the enclosures of the subwoofers I am going to be building over the next couple of months. Sonotube, or one of the comparable products made by other companies, provides a rigid enclosure without extensive bracing or many layers of MDF. MDF is very heavy, and requires you to build a box, so it's a lot of effort to build something that then becomes very hard to move around. The downsides to Sonotube are that you can only place drivers or anything else at the ends, and it has to be round or you don't get the rigid behavior.

Posted by josuah at November 11, 2006 7:33 PM UTC+00:00

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