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Portable 15-Inch 2-Way powered pa speaker system hifi audio system ceiling combo speaker aktiv set - AliExpress Consumer Electronics
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My old PA subwoofer makes this weird rattling noice after the initial bass sound (details in comments) : r/diyaudio
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DJ-Checkpoint, Light & Sound Equipment Online Shop-POWER DYNAMICS "PD618SA" Aktiver 18" PA-Subwoofer
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