This keeps electrical upgrades minimal with less added strain on the vehicle. With a high energy, double stack motor paired with a laminated triple layer poly cotton spider suspension the 600 Series works best with vented and multi-order enclosures. High-temp, 2.0, voice coil. Double Layer Deep bass, high excursion spider system.Unique glass fiber and natural pulp cone. Back plate coil gap venting. 606d: 250w to 500w - 6.5 Inch Power Tuned Subwoofer. 0.25 - 0.5. 0.25 - 0.75. In order to maintain an inventory of 100%, Brand New, A-Stock, untouched products, all sales are final. We ask that you please be sure you are ordering the correct product.