The a/d/s/ HT300 high performance bookshelf loudspeakers were designed to produce a superior three-dimensional sound field, perfect for listening to a vintage jazz album or the latest action/adventure DVD. The HT300 model share the same a/d/s/ proprietary 1" soft-dome tweeter, custom copolymer 5¼" bass drivers and audiophile grade crossovers to ensure identical frequency response. The HT monitors incorporate a modular arrangement of interlocking driver baffles mounted in a high-density extruded aluminum chassis. These advance components and techniques create a visually pleasing and sonically capable system. Features: 10 - 80 watts Recommended Power One 5" high compliance woofer with butyl rubber surround & One 1" soft-dome tweeter Frequency response: 54 - 20,000 Hz, 3 dB Nominal Impedance: 4 ohms Efficiency: 88 dB SPL from 2.8 VRMS ("1 watt") @ 1 meter Crossover: 2-way passive, 12 dB/octave slopes Acoustic suspension, textured aluminum enclosure Dimensions (HxWxD): 9 7/8" x 7 1/4" x 9 3/4"