car - Wiring 2x subwoofers down to 1 or 0.5 ohm on a 2 ohm verified amplifier? - Sound Design Stack Exchange
12" Subwoofer Dual 2 Ohm Trinity 3000W Full Range Amplifier Combo | eBay
Alpine W12S4 12" 250 Watt 4 OHM Subwoofers with GTR-601 Mono Subwoofer Amplifier 600 watts RMS x 1 at 2 ohms - Creative Audio
BOSS Audio Systems R1100M-S Riot Series Car Audio Subwoofer Amplifier - 1100 High Output, Monoblock, Class A/B, 2/4 Ohm Stable, Low/High Level Inputs, Low Pass Crossover, Mosfet, Hook Up To Stereo -
Subwoofer wiring diagrams
Rockford Fosgate Power T1D212 12" dual 2-ohm voice coil component subwoofer and Rockford Fosgate Power T750X1bd Compact mono subwoofer amplifier — 750 watts RMS x 1 at 1 to 2 ohms and a SOTS Lanyard