Featuring 6-1/2' of folded horn chamber length in its cabinet, the Cerwin-Vega EL-36C "Earthquake" Folded Horn Subwoofer has bass frequency extension similar to a 36" driver with even more SPL performance A striking die-cast door improves the EL-36C speaker's heat dissipation capabilities. Acoustic impedance balancing reduces cone rocking and distortion. The curved horn mouth bracing provides a smoother frequency response. Enhanced front corner bracing plus a deep, reinforced pole offer additional durability and reliability.