Huge, acoustically superior new concert halls designed by superstar architects are all well and good for orchestras that can afford them, but those can be counted on one hand. So what is everyone else supposed to do to improve the quality of live sound? A California company is marketing its supposedly undetectable electronic enhancement systems. There’s plenty of resistance, of course, but “we live in an electronic, computerized, rock ‘n’ roll world. How can electronics be kept at bay in the concert hall?”