 As the businesses grew, Speaker Warehouse essentially became a dealer of JL Audio products under the direction of Stephen Seidl.In the late 1970s and early 1980s, as the car audio revolution was starting to take place, Speaker Warehouse was a big seller of the early pioneering car audio products.Stephen Seidl, Birch and Proni used their knowledge of speakers and audio to experiment with these systems, especially with component systems with subwoofers.