Polk Audio Monitor 70 Series II Floorstanding Speaker 1-inch (25mm) fabric/polymer composite Dynamic Balance dome tweeter with powerful neodymium magnet structure delivers clear and detailed high frequency response for realistic reproduction of vocals and instruments 5 1/4-inch Bi-laminate composite dynamic balance drivers are lightweight and stiff with good damping for high efficiency, excellent bass and lower distortion Multiple small-diameter driver design delivers wide dispersion, better mid-range, and more detailed bass response for an open, "box-less" three-dimensional sound Cascade Tapered Array (2-1/2-way) design. Both drivers play bass frequencies but only one driver (the upper one) plays upper-midrange frequencies. This method provides maximum bass output along with precise imaging and detailed midrange response Non-resonant all-MDF enclosure construction with 3/4-inch thick baffles and front to-back and side-to-side internal bracing ensures cleaner, clearer, more lifelike sound quality.Total Frequency Response:30 Hz  25 Hz