On Sunday 16 March 2014 19:56:32 Ralf Mardorf did opine: > Gene :) > > ok, when I've got the time to do it, I will borrow the Brauner VM-1 tube > mic + an ART tube pre amp from a friend, connect it directly to my RME > HDSPe AIO and pick Blackbird from the Beatles on my classical guitar and > do a recording at 48 KHz and 192 KHz. > > I don't know what will happen, but I suspect there will be no audible > difference. > > Regards, > Ralf > > Even with tons of string squeaks from wound strings and heavily callused fingers, I doubt if that would reach high enough to be a valid test. You need a few crickets singing in the background, (typically 17 Khz) and some heavy action on a brushed snare drum to generate very much in the range of sound that would test it for sure. A "white noise" generator made out of the usual 17 stage xor gated shift register for feedback, clocked at 50Khz or more might be a good test, the white noise will seem to have a odd, often disagreeable, definitely non-harmonious pitch to it. But I haven't seen that schematic in yonks. Take a look at <http://en.wikipedia.org/wiki/Linear_feedback_shift_register> Some of the longer ones are pretty decent. the 17th register addition is one I heard once, sounded pretty white to my ears at the time. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
