Easy to build, with complete plans, drawings, photos, step-by-step instructions. This sub has substantial output to 20Hz.
Awesome addition to your audio mixing/mastering station, home theatre or HiFi. We bought a commercially made sub for $400 and it would not adequately reproduce sound below 50Hz. This one sounds far better, and cost much less.
Can be built in a couple of evenings from 1/2 sheet of plywood. Cost? less than $150 for everything, including the driver and amp!
more info and complete plans at http://acoustiwave.com
Click on website link below
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