FREQUENCY:75Hz-20kHz SENSITIVITY: 88dB/W/M PEAK POWER: 160W RMS POWER: 50W IMPEDANCE: 4ohm VOICE COIL: 25.5mm MAGNET WOOFER: ferritys MAGNET TWEETER:NEO(NEODYMIOU) SIZE WOOFER: 4″(10cm) SIZE TWEETER: 40mm MYLAR DOME MATERIAL CONE: WOOFER INJECTION CONE MATERIAL TWEETER:PEI DOME Pair