A double-conversion UPS with an insulated-gate bipolar transistor rectifier and inductor can have a THD I as small as 2%. Source: Internet
A number of formulas that attempt to correlate THD with actual audibility have been published, however none have gained mainstream use. Source: Internet
Different types of distortion (like crossover distortion ) are more audible than others (like soft clipping ) even if the THD measurements are identical. Source: Internet
For instance, crossover distortion at a given THD is much more audible than clipping distortion at the same THD, since the harmonics produced are at higher frequencies, which are not as easily masked by the fundamental. Source: Internet
For instance, a signal with THD F 266% has a THD R of 94%. Source: Internet
Harmonic distortion in radio frequency applications is rarely expressed as THD. Source: Internet