tectonicproaudio på Twitter: "The Tectonic LS-218 Subwoofer, designed to complement the DML500, creates a true full-range, high-output system. (cont) #audioengineer #avtweeps #proav https://t.co/0EmK6OXmpC" / Twitter
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MARTIN Audio Blackline S218 Dual 18 inch-driver vented sub-bass system Bass-Reflex PA Cabinet - YouTube | Subwoofer box design, Subwoofer box, Speaker box
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