Amplifiers are a very important part in a Car`s Stereo system for they receive the signals from the head unit and transfer them to the speakers. The signals that come from the head unit generally are in a raw form which are first received by the preamps which refines and tunes them and then send it to the amplifiers which is the impetus for the speakers to emit the sound waves as musical tunes. These amplifiers have the capacity to increase the power of the audio signals received to create world class sound http://autoradio-1001.com/de/. The preamps negligibly boost up the signals to make them amplifier compatible. Apart from this, there are also some outboard amplifiers which perform similar functions but as a separate external part.