VOLTRIC 70 YONEX Badminton (Racquet Unstrung) TRI-VOLTAGE SYSTEM traditionally, extra weight at the top of the racquet frame has increased hitting power but reduced the speed of racquet handling. In contrast, a lighter top to the frame increases speed but causes a loss of hitting power.. ISOMETRIC DESIGN In VOLTRIC, the weight is balanced on the top of the frame and at the joint area which allows good handling while also maintaining power. Another innovative YONEX technology, SOUND FILTER uses new materials at the two and ten O'clock positions to reduce only high pitched and dull soundwaves. This produces a louder and sharper sound on impact to unsettle opponents.