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AVLeaderz via Amazon [amazon.com] has Alpine S-A60M S-Series 600w Mono 2ohm Class D Mono Amplifier on sale for $ 149.95. Shipping is free.
Additional information via product page:[LIST][*]mono subwoofer amplifier[*]330 watts RMS x 1 at 4 ohms (600 watts RMS x 1 at 2 ohms)[*]CTA-2006 compliant[*]variable low-pass filter (50-400 Hz, 24 dB/octave)[*]variable bass boost (0-12 dB at 50 Hz)