Alesis 3630 Compressor

The 3630 is a 1U rack-mount stereo compressor that has become legendary since the 1990s. Very affordable, it offers classic controls (Threshold, Ratio, Attack, Release, Output Gain) and an external sidechain, with fast and often quite pronounced compression. Its character can be a bit rough or colored, but that's precisely what makes it so popular: it adds punch, presence, and a "big sound," especially on kick, snare, bass, or bus, making it an economical classic in the studio, even if some prefer more transparent compressors.