SPECIFICATION   Mode DSP901 DSP902 DSP903 Full-range Speaker / HF Driver 4.5"x1 6.5"x1 4.5"x1 Normal Power 3W 6W 3W Max Power 6W 12W 6W Line Voltage 70-100V 70-100V 70-100V Sensitivity(1m,1W) 91dB 92dB 91dB Max.Sound Pressure Level(1m) 97dB 100dB 97dB Freq. Resp. 100-16,000Hz    80-14,000Hz 250-16,000Hz Hole for Mounting 155x158mm 192x194mm 155x158mm Dimensions(mm) 110x168 115x205 110x174