Mackie SRM 1850, Active Subwoofer, Power: 800 W RMS, 1600 W Peak, Class D power amp, Equipped with an 18"" speaker with 3"" voice coil, Frequency range: 35 - 150 Hz, Built-in DSP, Stereo XLR input, Stereo full-range or high-pass output, Stand flange mount, Weight: 29 kg, Finish: Black textured paint finish, Suitable cover available under Article Nr #334757# (not included)