Level 3 The level 3 sub is the ultimate daily driver sub. It puts out the low lows with lots of output designed for sealed or ported enclosures. The Level 3 sub is a triple stacked FEA optimized motor wrapped in a magnet boot: chrome top plate and T yoke. The deep gap offers more X-max for a total of 22.5mm. This sub also comes with dual upgraded progressive spiders: cone: surround: 3" voice coil: cast basket: push terminals: and upgraded sewn down lead wire. We give the Level 3 a power rating of 900w RMS/1800w peak. Sub Size       18" Mounting Depth       9.5" Mounting Hole Diameter       16.75" Outside Driver Diameter       18.5" Motor Width       7" Weight       22lbs VC Diameter       3" Displacement       .22³ ft Magnet Weight       18lbs Power Handling RMS/Peak       900 / 1800 Impedance (Ohm)       D1/D2/D4 Sd       1217cm² Vas       185.6 liters Cms       0.09 mm/N Mms       305 g Fs       30.4 BL       17.2 N/A Re       3.6 Ohm Le       3.5 mH Qms       8.32 Qes       0.718 Qts       0.661 Xmax       23 mm Ref SPL @ 1 watt       90.4 dB (93.9@2.83V) Suggested Sealed       4³ ft Suggested Ported        5.5³ ft   LEVEL 3 SUB       Key Features • Extremely rigid non-pressed paper cone assembly • Multilayered polymer foam surround • Polypropylene dust cover with DC logo • Dual 8” OD semi cup progressive roll spider • Extra heavy duty interweaved tinsel lead wire sewn to spider • Cast aluminum black frame • FEA analyzed and optimized motor assembly – Fully CNC machined • Rubber mounting gasket • Chrome spring loaded push terminals • Dual 4 ohm 3” Hi-temp Aluminum voice coil wound on black anodized voice coil former