Sundown Audio Nightshade NS-Series NS6 18" 3000W Subwoofer NS v.6

3,000-Watt RMS Dual 1 or 2 ohm voice coils Optional carbon cone/dustcap available Custom tooled basket Custom-tooled ultra-linear spider packs Extended shorting ring Eight-layer voice coil Custom tooled basket Cast aluminum cooling ring Ultra-linear spider pack Unique air exchanging system forces hot air out and cool air in Aluminum vent ring Ultra-linear Mega Roll V2 surround  Features: The Nightshade 3,000-watt Neodymium sub is engineered to deliver incredibly powerful low end, with an extremely linear excursion and next-level thermal management. It features an eight-layer voice coil for excellent power handling and an extended shorting ring to minimize distortion and deliver a smooth, highly accurate sound at extreme SPL levels. Specifications: NS V.6 18 T/S SPECS NS V.6 18″ D1 NS V.6 18″ D2 RE (Ohms) 1.8090 3.6629 FS (Hz) 28.6283 28.3677 VAS (L) 78.9335 82.9318 Qes 0.4955 0.4948 Qms 5.2141 5.1127 Qts 0.4525 0.4511 Le (mH) 1.7089 3.3898