PRODUCT FPC1220 FPC1520 Woofer Size 12' ' 15' ' Voice Coil( inch) 2.5' ' 3' ' SPL( dB) 87 88 Impedance 4ohm 4ohm RMS Power 500W 600W MAX Power 1000W 1000W Freq.Resp( Hz) 40-2K 35-1.5K