CAD (short for Conneaut Audio Devices), manufacturer of the Equitek series microphones, specialize in the design and manufacturing of professional quality microphones. CAD is located in Conneaut, Ohio, USA.

CAD's line ranges from the affordable GXL Series, to their new generation of Equitek condensers which build upon the series' phenomenal sonic accuracy, price/performance ratio and overwhelming popularity with the pro studio market. Equally noteworthy are CAD's M177 cardioid and M179 multipattern condenser mics which have found favor with a growing legion of studio engineers. Other series of note are CAD's exemplary "C-Series" handheld mics and "V-Series" tube mics.