How to Graph Distortion Measurements
Distortion curves are conventionally plotted under the corresponding excitation frequency of the measured fundamental. This can lead to some difficulties in evaluation due to the influence that the passband shape of the fundamental response has on the distortion responses. By normalizing the distortion responses to the fundamental response, distortion graphs become easier to interpret. In addition, the distortion graph becomes insensitive to room reflections in the measured responses.
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