BIC Amercia Acoustech Platinum Series PL-89 tower speaker The Acoustech Platinum Series PL-89 tower speakers can be used for both the main and/or surround channels in any theater system. Video-shielded 250-watt (600-watt peak) two-way horn tower with dual 8-Inch woofers. 25Hz - 23kHz Frequency Response, 98dB at 1 watt, 1 meter sensitivity Two high power 8-Inch woofers with heavy duty surrounds, one 6 1/2-Inch mid/high frequency aluminum dome horn with neodymium magnet, magnetically Shielded, 8 ohms impedance