Step 5 fine tuning. Consider picking up a car stereo installation kit like this scosche kt12a budget kit from amazon.

Alpine W12s4
How to set up an amp in a car. If you already have amplifier you can just skip this step. Then use a screwdriver to tighten the amp to the floor so it doesnt move around. Step 1 volume and gain control adjustments. Step 3 bringing the bass. Step 4 back to gains. The proper way is to first turn the gain down turn all of the filters to off.
This is not the proper way to tune a car amplifier. Again check the underside of all surfaces before drilling then drill away and secure the amp using mounting. How to tune an amplifier. This is one of the single best steps. Position the amp in place and mark out the mounting holes with a pencil or marker. The power wire from your amp wiring kit usually 16 20 feet in length needs to run from the battery through your cars firewall through the cars body to the amp.
If you still havent got one and you are thinking about. How to properly hook up a car amplifier inside the house. Then turn up the car stereo til it starts distorting then. Step 2 tuning individual frequencies. Position the amp so the mounting holes line up with the holes you just drilled. Turn everything off unplug the rca cables connected to your amplifier and turn your stereo.
Setting your gain. Without a doubt buying the right amplifier speaker enclosure and subwoofer are critical for good bass sound. Feed a mounting screw into each of the holes and turn them by hand until theyre tight. Find an unused grommet in the firewall or one that already has wires or cables passing through it and that has enough room for the power wire to fit through too.