The BK501 is a passive speaker that was designed for HiFi stereo sound system applications. Feel the crystal clear and bright treble, full midrange, fantastic deep bass and dynamic sound. With Arylic's sonically engineering construction design, you can hear every details from the original sound. Features 100W, HiFi sound. High-end Heil AMT Tweeter. Treble up to 40khz, feel detailed treble clarity and brightness. 180° Wide soundstage, enjoy high quality pure vocals and instruments in every corner. Innovative design of 5" Fiber glass Mid-woofer with outstanding heat dissipation and no distortion. FSC Environmental Certification 15mm (BK501) super thick MDF cabinet design.