Plan #2 - Vented Subwoofer Enclosure

WinISD recommends a 3.2 cubic foot box with a 24 Hz tuning frequency for our vented enclosure. Using a four inch port we'll need a vent that is fifteen inches long. We must take this volume into account. The volume of a cylinder is pi*r^2*h, or (3.14)*(2)^2*15 = 188 cubic inches. Divide this by 1,728 to get cubic feet and we add 0.11 cubic feet to the enclosure. We'll achieve this by using 3/4 " MDF for the enclosure with external dimensions of 19.5" x 30" x 12.5". This will be a simple rectangular box. Modeling the enclosure we see that it has a 87 dB sensitivity and a -3dB (half power) frequency of 24 Hz (the tuning frequency). This box should give incredible amounts of output when it is combined with the 12dB/octave boost provided by most automobiles. This is to be expected with a box this large. In practice we would probably make the enclosure half this size, or similar to the size of the sealed enclosure.

JL Audio 10W1
SPL (1W/1m) - 87 dB
-3dB @ 24 Hz

Here is the layout of our subwoofer enclosure. We will need to cut the following pieces:

SIDE
QUANTITY
DIMENSION
TOP/BOTTOM
2
30" x 12.5"
FRONT/BACK
2
30" x 18"
SIDES
2
18" x 12.5"

 

JL Audio 10W1 - 3.3 cubic ft

You should also check out Advanced Enclosure Design and Fabrication. It covers designing enclosures using free computer software, maximizing the output of a subwoofer system, building the box like a pro and testing the output using inexpensive equipment.
Click here to get the details.

Next Page ---> Plan #3 - Bandpass Subwoofer Enclosure

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