If you want to have a complete system in your car, well, this is what a complete system consists of. Like I said again, most of the cars they do have six cones high in the back, six and a half in the front. These are for you to get the vocals, the high, the high pitch, that's what it is for. Also, if you look in the bottom, we have two woofers. This is your bass. This is the boom box that's what it's called. Now, in order for us to be able to run a system like this, which is very loud, we need two amplifiers. Like I said again, we have two channels, two channel amplifiers mean that this with one, we're going to be running two woofers, which is this one is running the two woofers in the bottom, this is a four channel amplifier, this is a four channel because it's running four speakers. All of this is run by that amplifier. Also, if you look at this right here, we have a crossover. This, most of the amplifiers they have already a built in crossover, which they do a pretty good job. Now, once you have added an extra electronic crossover, they have passive crossovers, but this one right here is an electronic crossover. Once you add something like that to a system, automatically you're able to adjust your system the best way. You can set it up whichever way you want this speakers to sound like, every time you move a switch like this, you're actually moving the quality or the sound that you're getting out of this speaker.