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[Spenser Hamilton]

Another very efficient DIY tapped horn sub design that has minimal angle cuts is Art Welter's "Keystone Sub" which has the general output and sound quality of something like a Danley TH 118 (although it is wider and taller, it has less depth), if the right driver is used. A B&C 18SW115 would be a good choice.

http://www.diyaudio.com/forums/subwoofers/185588-keystone-sub-using-18-15-12-inch-speakers.html  (see link to post #487)

I've built the Keystone and the Dual Lab12 design, both perform well for their application, the Dual 12 is my go to for small Jazz type shows. The DIY community owes Art a big kudos.

[Steve M Smith]

I thought this might be of interest to speaker building types.

https://www.facebook.com/grownmenstuff/videos/1662136114036276/


Steve.

[Art Welter]

I thought this might be of interest to speaker building types.

The cutter used resulted in a 90 degree corner, and a small gap in the glue joint. A decent idea for making a drawer, but speakers that are used on the road need to have the corners rounded and no glue gap. Even home stereo cabinets should have the corners rounded to reduce diffraction.

Of interest, can't think of a single speaker building application that I would consider using the technique for.

[Pete Erskine]

Parts Express is a good source online for speaker components, boxes and advice.

http://www.parts-express.com/cat/woofers/15