In terms of big sound with plenty of impact, double-18 subwoofers are the standard of the industry. Certainly, other variants can do the job, ranging from double- and quad-15 boxes to monster rigs with one, two or more 21-inch drivers, but in most large event systems, double-18 subs will deliver the goods. One of the easiest ways to upgrade an existing sound rig is to add a couple — or more — ground-stacked subs. In examining the current market of self-powered, double-18 boxes and found plenty of models to choose from. Check these out!
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