JohnSwenson wrote: > > The part that seems to make the difference is a monotonically decreasing > harmonic structure. The third harmonic is a little less than the second, > the forth is a little less than the third etc, all the way down to the > noise floor. Today this is a very easy measurement, a good sound card > and FFT software on a computer can do it. But up until 20 years or so > ago it took an expensive spectrum analyzer to resolve the harmonics all > the way down. > > This is VERY different than the "typical" solid state amp. With these > the 2nd harmonic will be very low or almost non-existant, then the third > will be much higher, then the forth very low, then the fifth a little > less than the third. In this sequence the even harmonics are very low or > almost absent and the odd harmonics are much greater. And somewhere > around the 7th or 9th harmonic the odd ones start getting higher. This > is a very different looking harmonic structure. > > You can't just stop at the 3rd or 4th harmonic, you have to go up to the > 13th or 15th to really see what is happening. That means don't just look > at 1KHz signals, look at some lower frequency ones as well. > > For some reason the human perceptual system likes the monotonically > decreasing harmonic structure better, even though the total amount of > distortion is greater. > I pondered upon your comments and then I looked through Stereophile's measurements on DACs with interesting results. See my post here: http://www.pinkfishmedia.net/forum/showthread.php?t=151401 I hope you don't mind me name-dropping you!
Check it, add to it! http://www.dr.loudness-war.info/ http://www.amazon.co.uk/gp/richpub/listmania/byauthor/A3H57URKQB8AQO/ref=cm_pdp_content_listmania/203-7606506-5721503. SB Touch ------------------------------------------------------------------------ darrenyeats's Profile: http://forums.slimdevices.com/member.php?userid=10799 View this thread: http://forums.slimdevices.com/showthread.php?t=99360 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
