227 — Exfeed

A defining feature of the Exfeed 227, and the one from which the brand derives its name, is its proprietary "Exfeed" technology. This is a feed-forward error correction circuit designed to eliminate the zero-crossing distortion that plagued many early 16-bit converters. In a standard DAC, the transition from positive to negative voltage can introduce a non-linear "glitch," resulting in a phenomenon known as crossover distortion. The Exfeed circuit detects this error in real-time and injects a correction signal to cancel it out. The result is a reproduction of silence and low-level signals that is profoundly black and devoid of the "grain" often associated with early digital audio.