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Determine where the ground wire is going to go. First of all, you have to run speaker wire from the amplifier to the speakers and/or subwoofers that the amplifier will be powering into. This is very straightforward in how its built.
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When a woofer is installed in one of these, the sounds that come from the front of the speaker cone are separated from the back. Usually, this will be 1. Now it is on to taking out your old radio. This will certainly improve your subs bass response, since opposing waves will now cancel each other out when they aren't being isolated. With the red power line running up through the firewall, you have to disconnect the battery as well as the built-in fuse on the subwoofer, and then hook the power line up to the battery connection.
1. Cut the power wire. If it is behind or under a seat, make sure you leave enough slack to allow some movement. Strip back a small portion of the insulation and connect it to the larger terminal that should be labeled "12 Volts" or other similar labels.
2. Determine where the ground wire is going to go. The ground wire needs to be attached to the vehicle chassis and it should be kept as short as possible. It must be connected to metal however, so remember that. Seat bolts or other frame bolts are a great place for grounding these. Scrape back any paint on the metal surface that will be under the ring terminal.
3. Connect the ground wire to the ground connection terminal on the amplifier.
4. Connect the amplifier remote turn-on wire to the turn-on connection.
5. Plug in the RCA cables, making sure the correct color plugs are connected to the amplifier (red to red, black to black)
6. Connect the speaker wires to the amplifier. Make sure the correct speaker wires are connected to the correct terminals on the amplifier. 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. ONLY USE THIS FOR THE SPEAKER WIRES.
Tip 1: Be sure that none of the copper strands from the wiring is exposed and touching the amplifier or the other terminals and wires. This could damage your car.
Tip 2: When running the wiring to the amplifier, make sure the wiring is tucked as far out of the way as possible.