Polk Audio bookshelf speaker R150 - Polk's exclusive driver design and the R150's solidly built cabinet work together to create smooth, accurate sound with minimal distortion. Highs and mids are clear, and bass is tight and accurate. A rubber surround increases the speaker's durability and power handling. Video-shielded, Bass-reflex (ported) design, Handles up to 100 watts, Frequency response 65-20,000 Hz (-3dB), 8-ohm impedance, Sensitivity 89 dB, 3/4" Dynamic Balance® tweeter with neodymium magnet, 5-1/4" Dynamic Balance woofer with butyl rubber surround, 5-way binding posts, 7"W x 10-5/8"H x 6-15/16"D, Comes with both left and right speakers (Pair). Comes with original box