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In general, 1/4" of fiberglass is roughly the equivalent to 3/4" of MDF when you view it from a structural standpoint, so a box for two 12' subwoofers might only weigh 15-20 pounds if it's built from fiberglass instead of MDFs 50 pounds. However you have to make sure that you leave enough space between the driver's magnet and the rear panel to allow unrestricted operation of the pole piece's vent which is usually about 3. Molding the enclosure to allow for this space maximizes available space, making the box less of a problem in putting it into the car.
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Fortunately you won't need any special tools to build a speaker enclosure, you will just need tools that you may already have in your garage. To do this, fill a caulking gun with silicone sealant and run a bead along the inside of each joint. 6th order band pass enclosures will have two resonance frequencies, one for each volume. Pull the power wire through the firewall from the inside of the vehicle until the extra wire is out from under the hood. Parallel wiring is connecting components to a source so that they share the same voltage. With so many choices out there, selecting drivers can be a difficult task.
You will need to remove your old radio from the dash so that you can connect the audio cable from your radio to the amplifier. You will have to make sure that your radio has audio outputs, which are also called RCA outs or preamp outputs, so that you can plug your audio cables into them.
If your radio does not have audio outputs of its own, you will need to purchase an amplifier that can accept a speaker-level input or you will have to get a converter that will convert a speaker-level signal to an audio cable signal. An amplifier turn on wire will also have to be connected behind the radio.
Here are the steps needed to remove the stereo:
1. Figure out how the current radio is secured into the dash. In most cases, this will mean taking it apart and removing certain parts of the dashboard or trim. Gather the appropriate tools and lighting if you need it. Place a drop cloth over any dash, console or front seats that you want to protect from debris.
2. Remove any screws that are holding the dashboard or trim pieces in place. Carefully search for screws that hold the dash piece. Be sure to check inside ashtrays, glove boxes for any of the hidden screws. In some cases, the dash piece is held in place with clips that are attached to its back. These clips will need to be removed with a panel tool. Before pulling out the dash panel though, you have to make sure that all screws and clips have been removed.
3. Once the dash or trim pieces are removed, the radio should be easy to see. Typically there are brackets or flanges holding in it the dash. Remove the screws or bolts holding the brackets and flanges.
4. Carefully slide the radio out only far enough so you can reach the wiring on the back. Depending on the space that you have available, you may be able to connect the audio cables without having to unplug the harnesses and take out the radio. Most of the time, you will need to remove the radio from the dash in order to plug in the audio cables and route them behind the dash.