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Selenium’s ST400 super tweeter is an extremely efficient high frequency transducer, capable of adding brilliance and articulation to any sound reinforcement system. A virtually indestructible phenolic diaphragm bonded to a polyimide voice coil former contributes to the ring radiator driver’s durability and non-fatiguing sound quality. The ST400 is recommended for larger venues, night clubs, and any other professional audio super tweeter applications that demand high output and maximum sound quality. Provides great results when deployed individually or arrayed in multiples.