Purpose-engineered and built for real marine duty, the MX-Series infinite-baffle subwoofers are designed to operate without a dedicated enclosure and are targeted towards moderate power applications. The MX10IB3 is best used with amplifier power in the 50W - 175W range and is optimized to operate with a large volume of air behind it (at least 2 cu. ft. / 56.6 l). If you need a subwoofer driver that operates in a small sealed enclosure, select our M10W5, instead. Like all JL Audio marine speakers, this driver is built to withstand a real saltwater marine environment and deliver years of listening enjoyment.