The ST400 BLK is an ideal super tweeter when the reproduction of high frequencies must define the instruments. Recommended for PA systems, stage monitors and most sound reinforcement systems in general. Extremely high sensitivity and lower distortion. Super tweeter for outstanding detail and clarity in highfrequencies without harshness. The ST400 BLK may be used individually in lower power systems or arrayed for increased coverage and SPL in higher power systems.  The base and diffuser are constructed of aluminum contributes to better heat dissipation of the coil moves, with finish machining of diamond (diamond tool) and varnished. The bullet-shape horn design offers a longer throw 40° x 40° dispersion. The phenolic annular diaphragm is long-lasting, costeffective and more natural-sounding than metallic diaphragms. The use of high-temperature materials and adhesives improves power handling and produces exceptionally high acoustic output. Together with magnetic ring of aluminum ensuring a high definition and efficiency across its fixed playback. Connectors with quick couplings. A precisely engineered diaphragm structure and alignment mechanism for easy, reliable, cost effective repair in case of diaphragm failure.