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![Plan] JBL PRX SUB 18" - YouTube | Speaker box design, Sub box design, Subwoofer box design](https://i.pinimg.com/originals/5e/18/7b/5e187b36d71b8edd276693f16634c981.jpg "Plan] JBL PRX SUB 18\" - YouTube | Speaker box design, Sub box design, Subwoofer box design")
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