The three-piece design with a more up-and-down direction of the natural frequency 55Hz we propose. The three-piece design with more than the left-right direction of the natural frequency 55Hz we propose.
Natural freak 55 in the vertical direction Enshi 3 piece with more than Hz specifications we proposed.Natural freak 55 of the left and right direction Enshi 3 piece with more than Hz specifications we proposed.