Radius 225 On-Wall Speaker (Single) At just 65 mm in depth, the 225 is the perfect match with today’s ultra-thin displays. Use it as a centre channel or main speaker: its acoustic design of twin 4" C-CAM mid/bass drivers astride a 1" C-CAM tweeter delivers superb accuracy from horizontal and vertical positions. Frequency Response 80 Hz - 35 kHz Sensitivity (1W @ 1M) 87 dB Nominal Impedence 6 Ohms Maximum SPL 107 dBA (Pair) Power Handling (RMS) 140 W Recommended Amplifier Requirements 40 - 150 W Bass Alignment Bass reflex - front ported Drive Unit Complement 2x 4" C-CAM bass/mid-range driver1x 1" C-CAM Gold Dome tweeter External Dimensions (Including Grille and Terminals HxWxD 5 1/2" x 24" x 3 1/16" (140mm x 610mm x 77mm) External Dimensions (Including Grille and Bracket HxWxD 5 1/2" x 24" x 3 5/16" (140mm x 610mm x 84mm) Weight (each) 9 lbs 4 oz (4.2 kg) Sold As Single Unit