When you start talking about big sound, ground-stacked double-18 subwoofers are pretty much the standard of the industry. And whenever you’re on that topic, the subject soon turns to “How many do you need?” This isn’t to say that there are other variants that can do the job — ranging from double- and quad-15 boxes to massive systems with one, two or more 21-inch drivers, but if anything defines the foundation of large event product today, it’s the double-18 sub. And one of the easiest ways to upgrade an existing sound rig is to add a couple — or more — ground-stacked subs.
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