PowerBass PS-12 12" Subwoofer 4-Ohm Subwoofer These woofers have a 2" BASV voice coils that you would normally find on a more expensive subwoofer. This large voice coil and former insures increased power handling and better linear travel. Versatility is what our engineers were tasked with designing these PS Subwoofers. They have the PowerBass DNA to be optimized for both sealed and ported enclosures so no matter what kind of music you listen to, they will perform! Features - • 12" Single 4-Ohm Woofer • 250 watt RMS/500 Watts Max • DDC Treated Paper Cone • 4-Layer Treated Foam Surround • 2" BASV Voice Coil Former • Stamped Steel Basket • Optimized for Sealed or Ported Enclosures Specifications - • Nominal Impedance: 4-ohm • BL: 11.32 • Voice Coil Size: 2 in • Material: DDC coated paper cone • Magnet Size: 40 oz • Sensitivity (1W / 1M): 91 db • Cutout Diameter: 11" (279mm) • Mounting Depth: 5.4 in • Xmax: 8 mm • Spl: 91db • No: 0.488% • Qts: 0.51 • Qes: 0.55 • Qms: 7.42 • Mms: 111.4 g • Cms: 216.85 uM/N • Vas: 81.58 Ltr • SD: 514.719 sqCM • Fs: 32.4 Hz • Test Impedance: 3.1-ohm • VC Impedance: 4-ohm • Size: 12 in • Sensitivity: 91 db • Frequency Response: 32hz - 450hz • Voice Coil Size: 2" • Power Handling (RMS/Peak): 250 / 500watts