PowerBass 3XL-820D 8" Subwoofer - Dual 2-Ohm, 500 wRMS The 3XL 8" Subwoofers all feature 2.5” HD BASV voice coil formers high temperature voice coil winding to help dissipate heat. To allow full movement of the cone, we utilize an ultra high roll foam surround that increases the cone area for higher output along with linear cone stability throughout the subwoofers peak excursion. The 3XL series have been designed to withstand the extreme heat that the new generation Class “D” amplifiers create. Class “D” amplifiers heat up the woofers voice coil two to three times hotter and faster than a conventional class A/B amplifier. This calls for Xtreme measures and special parts to classify these as a true “Class D Subwoofer”. But hey, this is PowerBass. They have it under control. Features - • 8" Dual 2-Ohm Subwoofer • 500 watt RMS/750 Watts Max • DDC Pressed Paper Cone • High Roll Foam Surround • 2.5” Vented HD BASV Voice Coil Former • Perimeter Aero-Vent Voice Coil Cooling Vents • Non Resonance DDC Coated Cast Aluminum Basket • XTRA XTRA Large Double Stacked Motor Structure • Square Spring Loaded Nickel Plated Push Terminals • Designed for Sealed & Ported Enclosures Specifications - • Nominal Impedance: Dual 2-ohm • Subwoofer Frequency Range: 35 Hz - 450 Hz • Depth: 6.2" • Voice Coil Size: 2.5 in • Material: Pressed and Coated Pulp Paper • Sensitivity (1W / 1M): 89 dB • Spl: 89 dB • Test Impedance: 1.83-ohms • VC Impedance: 2-ohm + 2-ohm • Size: 8 in • Sensitivity: 89 dB • Frequency Response: 35 Hz - 450 Hz • Voice Coil Size: 2.5 in • Power Handling (RMS/Peak): 500 / 750 watts