![]() Ensure that you have enough wiring for the job. If this isn't possible, you'll have to drill a new hole through the firewall. Wherever possible, try to use existing holes, following an existing wiring loom. In most cases, the main power wire to the battery will have to pass through the firewall. ![]() Always keep in mind the position of your battery in the engine bay and make the most direct path to it with the main power wire. RCA cables should be routed on the opposite side of the car to the power wires to avoid interference. It's best to run the wiring underneath floor trimmings that run along the bottom door sills, following preexisting wiring looms where possible. ![]() The next thing to consider is how you're going to route the wiring from the amp to the head unit of the stereo and the power wire to the battery. Mount them up high to avoid damage and maximize airflow. If you're fitting subwoofer speakers in a box, mounting the amplifier on the side of the box is a good option. They should always be placed in a position that allows maximum airflow. However, if you're driving, say, an SUV, space becomes limited and you'll need to consider mounting the amp under, behind, or between the seats.Īnother consideration is that amps generate heat-hence the need for cooling fans. A common place to fit an amp is in the trunk or luggage compartment of your car. The amount of space you have to work with will help determine the size amp you buy. But if yours does not, you'll need the main power wire, an inline fuse (use the size wire and fuse that the amp manufacturer recommends), a ground wire, RCA cables, speaker wires, remote turn-on wire and connector plugs to suit head unit, amp and speakers (some units may just require bare-wire connections). Most amps will come with a complete wiring kit. You can save money with a DIY car-amplifier-installation project. If you're looking to optimize your current car audio system, or even replace your old system for something with a little more grunt, then don't pay someone else to do it.
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