perito industriale;493639 Wrote: > But that got to do! > You're comparing 2 different things. You can not compare the distortion > of the signal and the power .. :-O > Distortion then is not the only parameter on which you decide the > quality of a component hifi / hiend! > is important but not the only, if you're a designer you should know
THD+N is pretty useless as a sole metric, that is true. Especially with loudspeakers where the on/off-axis FR measurements are more important. But... when you are splitting hairs over 0.005 THD+N Vs. 0.0001 THD+N, it is almost guaranteed that there is little audible difference between the two. Also, you have to more broadly define how it is measured. Small amounts of odd-order are very audible, higher amounts of even order harmonics much less so. Also, you would have to know where the distortion components are in relation to the frequency band. You can listen to 10% THD at 20 Hz and not tell a distorted sinewave from an undistorted one. So... yes, it is more complicated than a simple single number but there is plenty of research showing what is and what is not audible. With transducers, we are very happy to get 1% THD+N at higher listening levels. Those distortion products are both even & odd order depending upon the mechanism causing them. I'd say we are pretty safe in saying that those non-linearities swamp those that are another 40-60dB further down. It is like saying you can appriciate the sound of your hifi while using your chainsaw. Nobody would consider that a rational exercise, yet we routinely make such comparisons when judging audio components. The rational person, turns off the chainsaw before they fine tune their audio system for best performance. The irrational person quibbles about the nuances of the performance while ignoring the chainsaw. -- Kevin Haskins ------------------------------------------------------------------------ Kevin Haskins's Profile: http://forums.slimdevices.com/member.php?userid=30729 View this thread: http://forums.slimdevices.com/showthread.php?t=72246 _______________________________________________ Touch mailing list Touch@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/touch
