non linear frequency response in playback
My Imac has non linear frequency response in playback, a high frequency hump.
It is there irrespective of playback source, Itunes or a signal generator.
It may be some sort of leftover from the many sound programs and DSP I have played with.
All is now uninstalled and the PRAM reset. Still non linear frequency.
Any ideas out there?
iMac, OS X El Capitan (10.11.1)