Bookshelf Speaker, Boston Kortec soft dome tweeters for crystalline high-frequency sound, Graphite injected polymer woofers utilize Deep Channel Design (DCD) for more bass from less amplifier power, Acoustically tuned port for improved bass, MagnaGuard magnetic shielding prevents video interference, 5-way gold-plated binding posts for hook-up flexibility and the purest signal transfer, Frequency Range (±3dB): 120Hz - 20kHz, Recommended Amplifier: 10 - 150 watts, Sensitivity: 89dB [SPL/2, 8V at 1m], Nominal Impedance: 8 ohms, Crossover Frequency: 2,700Hz, Woofers: 31/2"" (89mm) DCD Graphite injected polymer woofer, High-Frequency Driver: 1"" (25mm) Kortec Soft Dome, Dimensions: 711/16""H x 5W x 415/16""D (195 x 127 x 124mm), SKU: OCT2616