APB-DynaSonics' ProDesk-4 small-format front-of-house consoles incorporate a wealth of professional features derived directly from the company's APB Spectra Series of consoles. Intended for use in Production, AV and Contracting applications, ProDesk-4 stresses simple operation while providing uncompromised audio quality in a compact package. It is a direct derivative of our well received ProRack-House mixers and answers the request of users for a desktop version of this mixer with more inputs and an expanded master section. ProDesk's audio design is based on our critically acclaimed Spectra Series consoles. This includes the use of minimum phase-shift circuitry, expressive EQ and integrated mic preamplifiers used in a proprietary front end circuit. In addition to superior audio quality, reliability and serviceability are also primary design criteria for ProDesk. Internal construction is based upon a series of passive mother boards and multiple active daughter boards. The active electronics of a single input channel is designed onto two field-replaceable electronics modules. Modular Mic/Line input channel configurations of 16, 24, 32, 40 and 48 are available plus all version of ProDesk-4 also include 4 Stereo Line input channels, one of which is fitted with USB digital audio inputs. Cosmetics and mechanical structures are similar to Spectra, but with a narrower module pitch and shallower front to back dimensions resulting in a truly compact design. Special provision are provided for overall remote muting of the Left-Right, Center, and Mono outputs as well as Group, Auxiliary and Matrix outputs by a rear panel opto-isolated phoenix connector.