Koss CM1030 was typical of the the era's preference for 4-way designs for high-end models. The idea was to limit distortion, compensate for frequency response errors and improve dispersion by limiting each driver to a narrow range. In this case, one 10" woofer with dual bass reflex ports, two midranges, one tweeter and one supertweeter. The cabinet is massive and solidly made. The sound is superb, and they're still sought after by audiophiles and music enthusiasts.