SELENIUM 15WS600 Channel Stage Subwoofer Bumped back plate and extended pole piece for maximum excursion Multi-cooling system directly cools the gap and the air trapped between the two spiders Designed for smaller enclosures, the WS600 series low and mid bass sound reinforcement woofers offer high power capacity, outstanding low-end response, and exceptionally smooth transition into the vocal range. Two counter-balancing, distortion canceling, polyester-cotton-fiber spiders Strong reinforced cast aluminum frame also acts as a heat sink Ideal for side fill as well as front of house cabinets, this new design is capable of handling up to 1,200 watts of continuous music power. Bumped backplate and extended pole piece for maximum -cooling system directly cools the gap and the air trapped between the two spiders 4" diameter copper wire voice coilNon-pressed long fiber pulp cone for linear response and strength Two counter-balancing, distortion canceling, polyester-cotton-fiber spiders Strong reinforced cast aluminum frame also acts as a heatsink