Couple questions regarding the spectrals of a hi-res vinyl rip 2016-05-28 14:21:24 Hello everyone,I have a couple of questions regarding the spectrals of two vinyl rips coming from the same source. The audio setup is: TT-integrated amp-USB soundcard (Creative SoundBlaster).Here are 3 spectrograms (taken with Audacity). #1-2 from the first rip, #3 from the second rip.Spectro 1: http://i.imgur.com/iGy11CS.pngSpectro 2: http://i.imgur.com/2C9oDe2.pngSpectro 3: http://i.imgur.com/As1VTEN.png1/ My first question is regarding the external noise clearly visible at 37-38 kHz. It's not on the record because it's there on all rips. Does it look familiar to someone? I was told that infrared receivers use such a frequency, between 36-40 kHz. But I'm scratching my head at how that could enter the recording process.2/ The cartridge/stylus is an Ortofon 2M Red. I checked the specs and the frequency range is 20-22.000 Hz. So my second question is how can there be so much audio information well above 22 kHz on the spectrograms? I would have thought that the recorded frequencies would end somewhere around 22 kHz, maybe 24 kHz but not much more. Am I wrong or missing something?If someone can shed some light on either one of my question I'd be very grateful.