Sends power to speakers. If you need one or not depends on how many rms watts the speakers you have are and your personal preferences. You can run the speakers off the power of the head unit but most of them only do about 22 rms per channel (4). I might be wrong but using the power from the head unit to power your speakers reduces the sound quality. If you are talking about powering subwoofes you will have to get an amp.Bullet23 said:this may be a stupid question but what is the purpose of an amp, and how do i decide if i need one or if it would benefit me to have one???
Definately Truega16freak said:If you are talking about powering subwoofes you will have to get an amp.