Postby silent_riot » August 14th, 2011, 4:06 pm
The rule of thumb efficiency figure was given in this thread - about 80% for Class D amps.
Measuring the actual efficiency would be a case of measuring the unclipped output of the amp with meters, a stable load and an O-Scope, while simultaneously measuring the power input with more meters.
Read up some amplifier power reviews and they tell you how they measure the output.
