Aside from the high-quality construction and top-grade materials used to make the Soundstream EXW-12, one of its selling points is the ability to use this 1-way car subwoofer in a sealed enclosure, with a vented enclosure or without any enclosure at all. A member of the highly acclaimed Exact Series of speakers produced by Soundstream, this Soundstream 12-inch subwoofer is a non-powered subwoofer for use as part of an automotive component stereo system. The Soundstream EXW-12 has an impedance of 1 ohm using a dual coil construction and has a sensitivity of 90.5 dB. Additionally, the Soundstream 12-inch subwoofer has a frequency response of 20 Hz to 1 kHz. This 1-way car subwoofer is made of paper and surrounded in foam for performance, durability and great sound. The Soundstream EXW-12 requires a mounting diameter of 11.25 inches, a top mounting depth of 5.9 inches and would perform admirably at all levels of use.