This bundle contains two of Alpine SWR-8D2 8" Subwoofer (2Ω + 2Ω) SPECIFICATIONS Power Handling CEA-2031 Power Rating: 350 W RMS Power Range: 150 W-350 W RMS RMS Power Handling: 350 W RMS Peak Power Handling: 1000 W PEAK Dimensions Mounting Depth: 4-1/2′′ Mounting Diameter: 6-15/16′′ Displacement: -0.050 ft3 Added Volume: +0.035 ft3 General Frequency Response: 30 Hz-200 Hz FEATURES Diaphram Material: Reinforced Parabolic Cone Structure with Poly-Mica Dust Cap & Pulp-Kevlar Cone Body Design: 2-Piece Structural Parabolic Surround Material: Injected Molded Santoprene Design: High Amplitude Multi-Roll Spider Material: Nomex Design: Progressive Conex Spider with Reinforced Layer Tinsel Leads Voice Coil Material: 38mm Voice Coil with High-Temp Design: 4-Layer DVC Winding on Spiral Cut Motor Structure Pole Geometry: Extended Pole Geometry Configuration: Compound Radius Curve Frame Material: Cast Aluminum Design: Perimeter Vented Heat Transfer Terminals Layout: One Side Design: Heavy Duty 8 gauge Push with Housing, Banana Plug Jumper Tinsel Leads Design: Reinforced Layer Spider Integration (Patent #6,810,988) Gasket Design: Concealed Mount Gasket (Integrated Grille System Ready, US Pat #7,760,900)