It is a simple unit with a simple purpose, it makes complete mixes sound bigger, with more power, punch and drive. It brings cohesion and strength to your mix without compromising clarity. To this day it remains a key element of the SSL sound and has featured on countless classic recordings. The availability of the Stereo Bus Compressor in a module for the 500 format makes this essential audio production tool available to users of the popular API 500 format modular rack platform.