PRO-4000 (400-4040) Specifications Faxback Doc. # 6378 Frequency Response:..........................................35-20,000 Hz Power Handling Capacity:........................................160 Watts Efficiency:.............................................92 dB SPL (1W/1m) Impedance:.........................................................8 ohms Speaker Complement:........................15 Inch High-Compliance Woofer 5 Inch Ferrofluid Cooled Midrange 1 5/8 x 2 3/4 Inch Ferrofluid Cooled Horn Tweeter Enclosure:..............Turned Port/Bass Reflex Design, Removeable Grille Dimensions (HWD):....................31 15/32 x 17 11/32 x 11 9/16 Inches (799 x 440 x 295mm) Weight:.................................................55.2 lbs (25.1kg) (LB/all-07/14/94)