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Alpine R-W10D4 Type R 10" Dual 4 OHM Subwoofer with GTR-601 Mono Subwoofer Amplifier 600 watts RMS x 1 at 2 ohms - Creative Audio
Two 2ohm and Two 4ohm subwoofers to monoblock amplifier, is it possible? | DIYMobileAudio.com Car Stereo Forum
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Pioneer TS-A300D4 1500 Watts 12” Dual 4 ohms Voice Coil Subwoofer + 1500W Monoblock Amplifier + Installation Kit Included
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