bgw introduced an audio crossover product in 1979 and new amplifier lines in '80 and '82. by 1983, bgw's skill in sheet metal work (acquired in fabricating their substantial amplifier housings) had grown to the point of it becoming its own source of company revenue. bgw began supplying finished metal products to a number of industries, and established a bgw-branded "rack and roll" line of 19-inch rack hardware in 1991.