18 Woofer/Speaker at 500 RMS - 1000 PeakSpeaker Magnet is 120 ouncesDriver has a 4 Voice CoilSpeaker Impedance is 8 Ohm.18 Woofer/Speaker at 500 RMS - 1000 PeakSpeaker Magnet is 120 ouncesDriver has a 4 Voice CoilSpeaker Impedance is 8 Ohm.