Product Description Model No. MWE-8 MWE-10 Features 8" Woofer 10" Woofer Magnet Structure: Y30 20 oz Y30 30 oz Power Handling(Max): 300 Watts 400 Watts Voice Coil: 1" ASV 1.5 " ASV Impedance: 4 Ohms 4 Ohms Free Space Resonance(Fs): 45 Hz 40 Hz Efficiency(1W/1M): 88 dB 89 dB Frequency Response: 45 Hz-4.5 KHz 40Hz -4.5 KHz Model No. MWE-12 Features 12" Woofer Magnet Structure: Y30 30 oz Power Handling(Max): 500 Watts Voice Coil: 1.5" ASV Impedance: 4 Ohms Free Space Resonance(Fs): 38 Hz Efficiency(1W/1M): 91 dB Frequency Response: 38 Hz-4.0 KHz