Over the last 40 years I have never used them. I have always tweaked my room and speaker placement. However, now I have a new room, speakers and power (McIntosh) units. I am currently using a McIntosh c47 preamp. After dialing everything in the sound was very good. However, it was still a bit bright for me. I bumped the treble down 1 notch and it sounds better to me. I don't think it was the amp/preamp, I have used McIntosh forever. But with the new speakers, new room and my older ears things have changed. I would say (for me) perhaps a small change (knowing that tone controls affect a pretty broad range of frequencies) may help.
Bass and treble levels
Where would you mostly set bass and treble levels on a good quality integrated amp? Any difference for vinyl vs. streaming?