TS-615S/ TS-618S High-end Ultra-low Frequency Loudspeaker Datasheet Manual Firmware Feature18-inch subwoofer.18mm birch housing, lightweight, wear-resistant spray paint treatment, and internal dust-proof net cotton.Large-area inverter holes can reduce distortion.There is a jack on the top that can be installed with a 35 mm column.Applicable to bars, large multi-function halls, banquet halls, high-end lecture halls and auditoriums, etc.Specification:ModelTK-181SImpedance8 ΩFrequency response40Hz-400HzRated power600WPeak power2400WMaximum SPL(rated/peak)127dB/133dBSensitivity99dB/@1W/1MSpeaker18 ” woofer x 1Size550×700×688mm(height×depth×width)Weight39Kg