 and the old factory closed down.For the next 25 years, Crooks continued design work for various amplifier companies, such as Barcus-Berry (which later bankrupted and re-emerged as BBE Sound under new ownership).Crooks, for instance, developed early prototypes of company's "Sonic Maximizer" (although it wasn't originally titled "Sonic Maximizer" at the time) and holds a handful of patents of related techniques to "correct" phase response of speaker systems with alleged lead and lag characteristics (in phase) at inductive and capacitive regions of the reactive load.