Installing an amp in your 2007 Honda Civic with a factory head unit is a great way to add low-frequency response, or bass, to your factory sound system. Installing an amp on a factory head unit can be done with a part called a line output converter (also called a line-level converter). This diverts a small amount of power from your rear speakers to turn the speaker wire into the set of RCA cables you need to run your amp.
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Things you need
- Amp installation kit
- Line output converter
- Terminal connectors
- Drill with screwdriver bits
- Metal screws
Open the bonnet and disconnect the negative battery terminal.
Attach the power wire to the positive terminal of your battery using the clamp that comes included with your amp wiring kit.
Remove the fuse from the in-line fuse holder.
Run the wire to the back of the car, and leave as much slack as necessary. You can always cut the slack when you are mounting the amp. You'll have to route the wire through the hole in your car's firewall.
Locate the factory amp, and use a t-tap to tap into the light blue remote turn-on wire. The amp is located in front of the centre console, under the dash. To use a t-tap strip about ¼ inch of wire off of the end of the remote wire that came with your amp kit. Place the stripped end into the round opening of the t-tap and crimp it down with your wire crimpers to hold it in place. Place the other end (that looks like a mouth) over the light blue wire and crimp it down to pierce the wire and make a connection.
Run the wire next to the power wire and to the back of the car (boot).
Open the boot and locate the two rear speakers. You'll see the magnet from the speaker hanging down from the top of the boot upon opening.
Use t-taps to connect the line output converter to the rear speaker wires. Ensure that the right positive attaches to the right positive of the line-out converter, as well as the right negative to the right negative. Repeat for the left side. The speaker wire colours are shown in the "Amp Install Tips" (see Resources).
Plug the RCA cable that was included with your amp install kit into the RCA plug on the line output converter.
Strip the end from the ground wire, and crimp a terminal connector over the stripped end of the wire.
Ground the amp by cutting a piece of carpet, or lifting the carpet and screwing a metal screw into the wheel well over the terminal connector (use a washer if needed). Use the wheel well to avoid hitting the gas tank, which is located directly under the boot.
Connect the power, ground, remote and RCA cables to the appropriate places on the amp. This is all clearly marked on the amplifier.
Mount the amplifier in your desired location. The back of the subwoofer enclosure makes an excellent choice.
Attach the speaker wires from the subwoofer to the speaker inputs of the amplifier, taking great care to ensure that positive goes to the positive terminal and negative goes to the negative terminal.
Plug the fuse into the in-line fuseholder.
Close the bonnet.
Hide the wires under carpet, or inside body panels if you feel it's necessary.
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