Energy ES subwoofers were designed to work best when used in small enclosures. However, their electro-acoustic parameters are optimised for use in many different enclosure types; both in terms of typology (sealed box, reflex, bandpass, etc.) and in size, insuring extraordinary versatility and performance. The use of a long excursion mobile voice coil and high flux density double magnet have created subwoofers that can stand very high power with outstanding musicality and bursting dynamics. The special anti-scratch finish and butyl rubber rings offer protection and an aggressive look.