The Magnetic Fluid Damping System (M.F.D.S.) is another innovative design for our revolutionary speaker drivers.  As shown in the picture, our S.V.F. driver does not have a spider when it's used for midrange, which is an essential part of conventional speaker drivers for holding and stabilizing the sound coil!  Although the spider is important for conventional speakers, it is also considered as a source of vibration and sound coloration.  Our  M.F.D.S replaces the spider completely for the midrange, increase the driver speed dramatically, and enable the purity of sound reproduction.