TS-A30S4 Subwoofer comes with Rubber Surround which increase the movement stability and linearity leading to accurate bass sound. TS-A30S4 Subwoofer comes with Glass fiber and mica reinforced IMPP cone. The combination of the material and Dynamic tornadostep shape realize high rigidity and authentic bass sound at affordable price. New developed powerful motor assembly is able to achieve Punchy and Loud bass sound at 1400W maximum power.