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You should also realize that it's easier to measure in cubic inches and then convert them to cubic feet. 33 ohms. First make a hole at the bottom of the enclosure's back panel where you will have the speaker-cable connector. (The more you need, the pricier they will get) They also have the greatest impact on the overall sound of a car stereo system.
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With all wires securely in place you have to secure the drivers to the baffle board and take a screwdriver-size hole in the speaker. Take a look at how the curve goes up at both ends of the scale. No you cant! We want better than the boom box to carry this awesome sound. Boost is typically used for subwoofers.
Please note that these were located at http://www.caraudiohelp.com/plans_for_subwoofer_enclosures/plans_for_subwoofer_enclosures_sealed.htm
Plan #1 - Sealed Subwoofer Enclosure
WinISD recommends a 1.55 cubic foot box for our sealed enclosure. We'll achieve this by using 3/4 " MDF for the enclosure with external dimensions of 15.5" x 24 " x 10 ". 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 42 Hz. This box should give very strong output when it is combined with the 12dB/octave boost provided by most automobiles.
JL Audio 10W1
SPL (1W/1m) - 87 dB
-3dB @ 42 Hz
Here is the layout of our subwoofer enclosure. We will need to cut the following pieces:
SIDE QUANTITY DIMENSION
TOP/BOTTOM 2 24" x 10"
FRONT/BACK 2 24" x 15.5"
SIDES 2 15.5" x 10"
JL Audio 10W1 - 1.55 cubic ft
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*r2*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 30.5" x 12.5"
FRONT/BACK 2 30.5" x 19.5"
SIDES 2 19.5" x 12.5"
JL Audio 10W1 - 3.3 cubic ft