ACOUSTICAL QUAD II AMPLIFIER aamp; CONTROL UNIT Finest in appearance . . . efficient in design . . . superb in Hon; plug-in ... full- throughout, and a full 15 watts of audio output 20-20, 000 range fidelity, 10 to 60, 000 cps., within db; independent ... Never before has such superb response, dynamic realism and high magnet sensitivity been achieved in a speaker ... This is the complete schematic diagram.