BEHRINGER Studio Monitor, Black (B2031A) Ultra-linear frequency response from 50 Hz to 21 kHz with individual frequency diagrams Built-in 265-Watt Bi-amp module with enormous power reserve Ultra-high resolution ferrofluid-cooled tweeter Long-throw 8 " woofer with special polypropylene diaphragm and deformation-resistant aluminum die-cast chassis Controlled dispersion characteristics and extremely large sweet spot owing to the unique BEHRINGER wave guide technology