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QUAD 22 preamp was designed to work with one (mono system) or two (stereo system) QUAD II amps. Its features, in particular, interchangeable external modules predestined it to act as an audio system control device. This has been reflected in the name of the device, which identifies them not as a typical preamp but the control unit (full, original name is "The Quad 22 Control Unit." Due to the fact that even the manual is common for QUAD 22 Control Unit and QUAD II amplifier, photographic presentation begins with a few shots of full audio system designed for stereo reproduction.