The Audiophile's Project Sourcebook: 80 High-Performance Audio Electronics Projects
From New Literature Section:The clear, illustrated schematics and instructions provided in this book allow audio enthusiasts to build high-quality, high-power electronic audio components and testing equipment.  The author gives easily comprehensible explanations of the electronics at work, as well as a practical foundation needed for experimentation and modification of existing voltage emplifiers, balanced input driver/receiver circuits, graphic equalizers, and effects circuits. (Poptronics)