andy1249
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andy1249, as a percentage, THD+N in solid state amplifiers rises dramatically as the volume and therefore power levels are reduced. Check out the measurements page on any of the online Stereophile amplifier reviews.
The situation is exactly the opposite of what you say. Measuring THD+N at power levels just below clipping (and therefore very high volumes) gives misleadingly favourable results.
Total Distortion is made up of many distortion types.
Two main components are clipping type distortion ( main concern) which increases with level, and crossover distortion ( lesser concern ) which decreases with level.
Clipping distortion being the major contributor and least desirable (Most destructive), measurements are made for worst case scenario of this type.
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