IBUS 8-D2 - Focal 8" 2 Ohm Shallow Subwoofer Dual 2 Ohm Voice Coils Subwoofer Focal Integration IBus 20 Nominal Impedance: 2 ohms | Voice Coil: Dual (D2) Top Mount Depth: 2" | Cut Out Diameter: 7" Woofer Surround: Butyl Rubber | Aluminum Dust Cap Frequency Response: 45Hz - 150Hz