Class AB audio amplifier for use with loudspeaker enclosure, has Voigt type speed bridge circuit with feedback unit having current and voltage feedbacks, where ratio between feedbacks is comprised between specific values

摘要

The amplifier has a Voigt type speed bridge circuit including a feedback unit with current feedback and voltage feedback. A filter placed at the output of the amplifier permits to linearize the frequency response of a loudspeaker enclosure based on ratio of voltage feedback and current feedback. The current feedback takes into account motional impedance of an output load of the circuit. The ratio between the feedbacks is comprised between 0.4 and 0.5.