Accuracy Pro Audio - WQ18D1-4K Amplifier: Class D with DSP mode Peak Power: 2800W RMS Power: 700W Frequency Range (-10db): 35Hz - 150Hz Maximum output level (1m; on axis): 140dB SPL LF Driver: 18" cone, 4" VC/100oz Magnet: Ferrite Input: 2 x Balanced XLR/ 6.35mm Jack Loop output: 2 x Male XLR