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car subwoofer troubleshooting
For example, if you need to figure out the current (amps) moving through a 12 volt circuit and you know the resistance of the circuit is 4 ohms; the equation would look like this: E = 12volts I = unknown R = 4 ohms I = E/R or I = 12/4 which is I = 3 ampsP = E*I (power equals voltage multiplied by current or watts = volts amps). Then mount the connector of your choice and, use your finger to seal the opening with silicone. Of course, with the need for music, we also have a need to experience it in better ways. I hope that this has let you understand the basics of sound enough for you to really see how it travels.
install a car subwoofer
If it is behind or under a seat, make sure you leave enough slack to allow some movement. Do not buy speakers from salespeople that do an A/B comparison of loudspeakers for you. Installing the Woofer. Make 3/8-inch starter holes with a drill and then cut out the holes using the jigsaw. If you are unsure which set of wires goes to which speaker, you can use an alkaline battery (AA or AAA) to "pop" the speaker to help determine which speaker wires go to which speaker.
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