FPD-8WP FPD-6WP FPD-5WP Woofer Size 8' ' 6.5' ' 5.25' ' Voice Coil( inch) 1' ' 1' ' 1' ' Magnet( oz) 20 15 10 Tweeter( inch) 1/ 2 1/ 2 1/ 2 SPL( dB) 90 90 90 Impedance 8ohm 8ohm 8 ohm RMS Power/ MAX 25/ 50W 20/ 40W 15/ 30W Freq.Resp( Hz) 30-20K 40-20K 50-20K