TS-628S High-end Ultra-low Frequency loudspeaker Datasheet Manual Firmware FeatureAdopt two 18-inch subwoofer units.18mm plywood housing, light weight, wear-resistant spray paint treatment, and dust-proof net cotton outside.Large inverter hole can reduce distortion, and the low frequency is more powerful.Specification:ModelTS-628SImpedance4ΩFrequency response40Hz-400HzRated power1200WPeak power4800WSensitivity101dB/W/MMax SPL(rated/peak)132dB/138dBWoofer18″ woofer ×2Size770×995×600mm (H× W×D)Weight77.5Kg