The Celestion TF0615MR 6" professional midrange speaker is a purpose-built device dedicated to high-SPL, low distortion reproduction of the critical midband frequencies. Its integrated sealed chassis isolates the driver's soft parts from the loudspeaker system woofer's "back pressure", while at the same time eliminating the need to construct a separate sub-enclosure. The TF0615MR features a 1.5" high-temp voice coil and 17 oz. ceramic ferrite magnet, guaranteeing high efficiency and excellent power handling.