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 -
Alpine W12S4 12" 250 Watt 4 OHM Subwoofers with GTR-601 Mono Subwoofer Amplifier 600 watts RMS x 1 at 2 ohms - Creative Audio
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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
Kicker 44cwcs124 Compc 12" 4 Ohm Subwoofer Compatible With Gtr-601 Mono Subwoofer Amplifier 600 Watts Rms X 1 At 2 Ohms : Target
Amazon.com: BOSS Audio Systems R1100M 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 Power Supply, Stereo :
Wiring subwoofers — what's all this about ohms?
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car - Wiring 2x subwoofers down to 1 or 0.5 ohm on a 2 ohm verified amplifier? - Sound Design Stack Exchange
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Amazon.com: AUDIOTEK AT3500S 2 Channel Stereo Car Amplifier - 3500 Watts, 2 Ohm Stable, LED Indicator, Full Range, Bass Knob Included, Great for Speakers and Subwoofers : Electronics