PLAN] VTX G28 Subwoofer Dual 18" with internal plan measurement - YouTube
JBL Professional - #JBLPro VTX G28 subs ensured a smooth, robust low frequency response on the Summerfest Briggs & Stratton Big Backyard stage. #SummerOfVTX Clearwing Productions | Facebook
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JBL VTX G28 Ground Stack-Only, Dual 18-inch Subwoofer | VTX-G28-ACC Buy, Best Price. Global Shipping.
JBL's New VTX B28 Arrayable Dual-18” Subwoofer - YouTube