Hi all. Had a weird occurrence last night when a iso DSD file ended play. Notice a high pitched ringing noise that seemed constant in level. Upon checking with a frequency spectrum analyses I found that the right channel only had a 11025 hz noise spike that was rock solid and unwavering. I am using a MacBook Pro with usb out to my dac. I checked out my speakers and all components were functioning fine. Then I closed out Audirvana and relaunched. The spike was gone and has not returned. While I am not worried about this one occurrence, I am curious as to what may have been the cause of it. Has anyone else have this happen? Or can someone speculate as to wether this was more likely a computer or Audirvana origin? Thanks.