An interesting Amp with very low Noise figure, harmonics and distortion. It can be build with minimum parts and has a simple and low cost construction. The TDA2003 amplifier IC gives an o/p current of up to 3.5A. It also provides protection for short circuits, thermal protection above the allowable range, load dump voltage surge up to 40V and incidental break grounds. This can also be used as a Audio amp for Amateur Radio tranceivers. Here's the circuit diagram:
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Sound systems manufacturers
A good sound system has balance of bass, and treble and is not too loud and disturbing even on high volume.