One of the best upgrades you can do Is play 24BIT recorded CD'S. The sound of your base system will improve dramatically. The reason why is the that fine art of audio engineering is seldom praticed because many people believe MP3s is the sound of real music. Trust me when I say it isn't. Someone once asked me when I got the new sub installed. I replied nothing new just an extremely well recorded CD.

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….