Introduction to Sundown Audio X-Series v.4 8” Subwoofer The Sundown Audio X-Series v.4 8” Subwoofer is engineered for car audio enthusiasts who want maximum bass output without using large enclosure space. Sundown Audio is widely recognized for building high-performance subwoofers, and the X-Series v.4 lineup represents their most aggressive and durable designs. This 8-inch model...