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The Woofer
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The Passive Radiator
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The Amplifier
Powered by a Keiga 2.1 Media plate amplifier KG-3100.
Available from Madisound
This amplifier is well suited to usage with a computer
sound card, as it contains
50 Watt section for the sub and two 25 Watt sections
for the satellites, along
with an adjustable electronic crossover, and switchable
3 db bass boost at 40 Hz.
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Click on image to enlarge The Woofer |
Click on image to enlarge The Passive Radiator |
Click on image to enlarge The Amplifier |
Click on image to enlarge Made a drawing of the parts needed for the box. |
Click on image to enlarge Basic box made with ¾" Baltic Birch, glued and screwed together. |
Click on image to enlarge Cut out is made for the "plate amp". |
Click on image to enlarge Cut outs are made for the driver and two passive radiators. |
Click on image to enlarge ½" MDF is added to the front, leaving a ½" space on all sides. |
Click on image to enlarge Woofer cut out is routed, allowing flush mounting of woofer. |
Click on image to enlarge ¼" Oak plywood has been glued to all six sides, leaving a ¾" X ¾" V groove around the front. All other edges were routed to a 3/8" X 3/8" V groove. |
Click on image to enlarge ¾" X ¾" quarter-round solid oak moldings are installed on all front edges and 3/8" X 3/8" solid oak moldings are installed on all other edges. |
Click on image to enlarge Cabinet has had sanding sealer applied, and two coats of satin polyurethane applied, sanding with 400 grit paper between each coat. |
Click on image to enlarge The passive radiators have had weights of MDF cubes bolted to the rear of the cone to tune their output. |
Click on image to enlarge The finished 8", powered subwoofer. Front view, showing the driver and one passive radiator. The over all dimensions of the unit are: 12 ¼" Wide, 12 ½" High (w/feet), 13" Deep (+ 1 ½" for the amp heatsinks). |
Click on image to enlarge Rear view showing the 2.1 power amp and the other passive radiator. This makes an ideal add on for a computer with a pair of decent left and right front speakers. |