Yes, I have and use a graphic eq. I have many recordings of live performances made with a portable recorder and microphone. The resultant poor audio balance of these recordings needs a graphic eq to make them listenable.
For normal listening (eg. records/CD), I don't use the graphic eq. My preamp doesn't have tone controls, and doesn't need them. When I moved into my house and set up my stereo I spent some time experimenting with room treatments to get a good tonal balance from the stereo. Electronic tone adjustment is not required.
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