Eminence LAB 15 15" Pro Audio Subwoofer Speaker The Lab15 is a high-power, high excursion 15" subwoofer driver for applications requiring very deep bass at pro sound levels. Features include a 3" voice coil wound on a double layer aluminum former, an epoxy-reinforced apex/neck joint, and a double-laminated spider. This speaker also features a vented motor, both under the spider and through the back plate. Recommended for medium to large sized vented cabinets or horn-loaded designs for PA, sound reinforcement, or dance club applications. The Lab 15 is also suitable for small sealed cabinets for automotive use.