The Blackstone River Valley of Massachusetts hardly conjures up images of rock-and-rollers. But it has given rise to a handful of companies that make cutting-edge audio technology for making music really loud. One of the newest is Fulcrum Acoustic, founded in 2008 by audiophile Dave Gunness. He spoke with Globe reporter Michael B. Farrell about what makes this area of Massachusetts a center for audio ingenuity and why he’s making his products in America.
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