Watch it - this step’s a doozy. There are essentially six different types of car amplifiers you can get, so it depends on what works best for you. Each one of these different degrees of amplifiers are basically measurements of power. Let’s break them down by type: Mono Channel Also known as class D amplifiers, these tend to produce a bit more power than their older brother - the dual channel model. Class D amplifiers utilize multiple transistors, however, they are generally either in an on or off position - there’s not a lot of wiggle room here, so you’ll end up with a load of sound, or nothing at all. You get a lot of distortion with mono channel speakers, despite the fact that the sound passes through a filter. Overall, they’ll do the trick, they’ll refrain from pushing out a lot of heat, but they’re mostly used solely to power a subwoofer and don’t show a lot of promise on their own. Dual Channel You can power two speakers to get more of a surround sound output, and can also handle subwoofers with ease. These are optimal for trucks or vehicles with no trunk space; you’d put these beneath your seats. You can use both channels to power one speaker/subwoofer for maximum output. Three Channel You get two types of circuitry in one amplifier, making this perfect for trucks or SUVs with no room in the trunk to spare. Four Channel This is when you get into the big leagues. You can pack a full speaker system and support it with four channels; these are ideal for those wishing to turn their trunk area into an audio arena. Five Channel In the same way that a three channel system works, a five channel is really four channels, plus one that powers the subwoofer. Odd-numbered systems can sometimes be a pain, so be sure that this is something you really want/fits with your vision before you commit to a purchase. Six Channel You won’t see a lot of six-channel amplifier systems out there on the market. These are mostly found in large SUVs or Humvees for maximum power, sound, and audio quality.