For subwoofer placement, the rear cargo area is your only real option. A sealed enclosure delivers tight, accurate bass and is generally smaller, while a ported enclosure produces louder, boomier bass but requires more space . The XJ’s cargo area is notoriously small, so many owners sacrifice the rear passenger-side cubby hole for a stealth subwoofer enclosure . Others build a custom box that sits flush against the back seat, leaving the main cargo floor free for gear. Regardless of your choice, ensure the subwoofer is securely mounted—a 50-pound box becomes a dangerous projectile in a collision or hard off-road maneuver. Use heavy-duty ratchet straps or bolt the enclosure directly to the floor.
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