Audio Dynamics Corporation (ADC) was founded in the early 1960s by Peter Pritchard in New Milford, Connecticut, revolutionizing phono cartridge technology with the 'Induced Magnet' design derived from his earlier General Electric patents. ADC specialized in high-compliance, low-tracking-force cartridges like the breakthrough ADC-1 (0.6mg tip mass, 1-gram tracking), complemented by the innovative ADC-40 tonearm with tapered wooden shaft and anti-skating compensation. The company expanded into speakers using exotic KEF drivers, including the legendary B-1814 rectangular flat-panel woofer, and later developed a successful locally-manufactured speaker line. Pritchard sold ADC in the late 1970s to focus on his Sonus cartridge line. The original corporation merged or dissolved by 1975, representing a pivotal era in high-end audio when low tracking forces and high compliance defined cartridge excellence. ADC's legacy lives on through vintage equipment highly prized by audiophiles.