Glenn KnicKrehm is builing a performing arts complex in Boston. He’s putting $20 million of his own into the project, is raising the rest, and is steeping himself in acoustic theory. “He was a transplanted Californian who loved the Boston area but believed there was a hole in the cultural scene. There weren’t many prime spots for performance. And those that did exist, Symphony Hall and Jordan Hall, were run by massive cultural institutions. Smaller arts groups scrambled for open dates in second-tier spaces.”