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Subwoofer Amplifier Board 300w Low Pass Filter Subwoofer Pure Home Theater Active Subwoofer Amplifier, Amplifier For Subwoofer - Home Theater Amplifiers - AliExpress
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SUB-4K / SUB-5T Active Subwoofer High Quality LowPass Filter Freq. 40Hz~250Hz+Bass Boost+Phase - Motronix
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