D12 Active Subwoofer   Features： ▼Perfect combination the powerful mega bass professional virtual AB class amplifier with high quality 8 inches/ 10inches/ 12 inches subwoofer proves the convenient operation, strong power, energetic low frequency drive, natural and pure tone, powerful penetration. ▼Amplifier designs with the function of polarity converting, circuit inputting, balance inputting, circuit  outputting, balance outputting and frequency regulation. ▼Loudspeaker adopts the design of very large magnetic steel, high elastic broadside rubber and super long stroked big bore voice coil; the button of the woofer designs with the circular guide hole to improve the sound recirculation. ▼Application: KTV, Multi media conference, Entertainment center, Reception room, Household theater.       Technical parameters   Loud speaker Type 12-inch active subwoofer Frequency Response 20Hz-200Hz THD ≤0.07% S/NR ≥94 dB Rated Impedance 4 Ω Rate  Power 420W Input Level 350MV Overall Power Consumption 580W Maximum Input Impedance 30 k Ω Power ~220V-240V 50Hz/60Hz Weight 18KG Dimension 330x395*375mm