This bundles includes two 10" Solobaric L7 4 Ohm DVC Subwoofers 44L7S104 10" L7S 4 Ohm The Solo-Baric's cutting-edge, square-sub design means more cone area, more air displacement and more volume than a round woofer. Features: Dual Four-Ohm Voice Coils Injection-Molded Polypropylene Cone Patented Corner Ribs Minimize Distortion SoloKon 360-Degree Back Bracing Ribbed Santoprene Surround With Blue Surround Stitching UniPlate&trde; Black Plate And Pole Piece, Plus Perimeter Venting For Excellent Thermal Management Thick Tinsel Leads Large Ceramic Magnet Cast Aluminum Basket Satin-Nickel Plated, Spring-Loaded Speaker Terminals *The Solo-Baric L7S 10-Inch Subwoofer works best with a sealed or ported enclosure and 600 watts of recommended power. See below for more details. Specifications Size (IN.,CM) 10, 25.4 Impedance (OHMS) 4 DVC Max Rec Amplifier Power (WATTS PEAK/RMS)* 1200/600 Sensitivity (dB 1w/1m) 86.8 Frequency Response (Hz) 24-100 Mounting Depth (IN.,CM) 6-1/4, 15.9 Mounting Cutout, Square (IN.,CM) 9-5/16, 23.7 Min Rec Sealed Box Volume (CU. FT., Liters) .66, 18.7 Max Rec Sealed Box Volume (CU. FT., Liters) 1.0, 28.3 Min Rec Vented Box Volume (CU. Ft., Liters)** 1.25, 35.4 Max Rec Vented Box Volume (CU. Ft., Liters)** 2.25, 63.8