| Class A operation is inefficient. A perfectly valid question can be raised about the
efficacy of its use. My reply is based on objective and subjective grounds. Objectively,
bench measurements of distortion unequivocally improve with increased bias levels right up
to the Class A point. This assumes that power supply regulation is stiff enough . to
preclude significant drops in rail voltage as bias is increased.
Subjectively, I hear an improvement in ambiance and low-level detail as bias levels are
increased. To suddenly become aware of score pages being turned, batons hitting podiums,
or soft audience noises, is eye-opening (ear-opening?). The sense of "being
there" is impressive and, to me, is what highfidelity sound reproduction is all
about. |
