Dual 18" High-Power Sub-Bass, Bandpass Horn Design, Low Sub-Bass 28Hz Extension, CELTO Acoustic Loaded, Heavily Braced Birch-Ply & Ultratex (USA) Textured Black Finish, M20 Threaded Pole Adaptor, Genuine Neutrik, 3000W RMS, 4Ohm, Sen: 104dB/1W/1m, Cal Max SPL: 140dB RMS / 146dB Peak