... "woofer 3.durable quality and small qty Super Low Frequency speaker /High efficiency (MH-115+)MH-115 Characteristic:( ... Low distortion rate.(5) With super clear low frequency signal.(6) Good elasticity and durability in low frequency.(7) Applications: DISCO, ... Arenas/stage, Medium or large Ballrooms, Theaters, Club, Church, Concert Hall, multi-function hall, ...