For safety, wear insulated gloves that will protect you from any charge the battery might give off. You should also wear safety goggles when working with a car battery, in case any of the corrosive materials inside the battery begin to leak.
Note that this step isn’t necessary if you plan to surface mount your tweeters. The screws on a door panel are most likely located underneath the door lever and underneath the arm rest. The locations of the screws on your dashboard vary based on the make and model of your car. Check your user’s manual for specific instructions on how to locate these screws and remove your dashboard.
Note that if your car doesn’t have holes underneath the speaker grille that you can screw your tweeter into, you’ll need to drill those holes yourself. These will only need to be about 0. 25 inches (0. 64 cm) deep or so, in order to give the screws enough space to be securely attached.
Refer to the instructions that came with your base cup to see how precisely to attach the tweeter to it. Most cups simply require you to pop the tweeter into it, while others may have you use a screw to attach it. Ideally, you should drill into the door panel after it has been removed from the door itself to avoid inadvertently damaging anything behind the panel. If your door panel has an existing speaker grille in place, this is the best location for your tweeter. However, if there’s no grille on your car door, then feel free to install your tweeter wherever you want high-frequency sound to come from! This method of installation is called “flush mounting” because the top of the tweeter sits flush with the surface that it’s mounted on.
Avoid drilling the hole in the grille to deep, as you may cause unwanted damage to the speaker system. You only need to create an opening in the grille just big enough for speaker wires to pass through. Surface mounting is a useful installation method for when there aren’t a lot of deep places in your car where you can drill new holes for installing tweeters. The most common location for surface mounted tweeters is on the “A” pillar, which stands between your windshield and your front door window.
Most stereo crossovers are located inside the car door panel.
Your speaker wires will most likely be color coded to indicate which is positive and which is negative. In most cases, the wire with the stripe is the negative wire and the wire with the solid color is the positive wire.
Again, make sure you connect the positive and negative wires to their respective binding posts to ensure that the tweeter works correctly.
Note that if you have more than 2 tweeters in total, you may need to have an additional crossover installed in order to ensure all of your tweeters produce the same quality of sound.
