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SkyTec 15" Inch Subwoofer PA DJ Disco Low Pass Filter Bass Speaker 600w SMW15: Amazon.co.uk: Musical Instruments & DJ
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Skytec STP-1 passive crossover bass control subwoofer crossover with 1000W input power (1x PA subwoofer-out, 1xPA satellite out, 180Hz crossover frequency) : Amazon.nl: Electronics & Photo
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