JBL MRX518s Compact Passive Subwoofer
The MRX518 is a portable, eighteen-inch, subwoofer speaker system designed specifically for live performance stage monitoring applications.
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As low as $729.99 out of 2 sellers
User Review: I bought a pair of these at Guitar Center to go with the MRX515 tops. These MRX518s subs are quite subtle as far as subs go, and dont necessarily give you the "I need a chiropractor" feeling.