Rockford Fosgate Prime Series R1S4-12 - 12" 4-Ohm SVC Subwoofer : Amazon.co.uk: Electronics & Photo
Rockford Fosgate P3D4-12 (PAIR) & Rockford Fosgate T1000-1bdCP Pair of Punch P3 12" subwoofers with dual 4-ohm voice coils & Power Series mono sub amplifier — 1,000 watts RMS x 1 at
Amazon.com: Rockford Fosgate T1D412 Power Series T1 12" Dual 4-Ohm Subwoofer and a T1000-1bdCP 1000-Watt RMS Power Series Amplifier : Electronics