I use the Helmholtz tuning method also. Tune the room, the electrical grid and then minor adjustment if at all with tone control. It is usually because of a source issue.
Minor tweaks between sources is not uncommon. I use Streaming, CDs, SACD, TT and Reel to Reel.
You can fool yourself into thinking you don't need tone control, until you do. A good friend of mine made it pretty clear to me. A flip of a switch or a remote sure takes the leg work of old, out of the picture. I can set and adjust via a laptop or select a set preset functions already saved.
The bass was set up by SB (Seekers/Sound Boys). OHM's business. It's all digital, the Main speakers are all analog with passive crossovers.
I have one friend that insist if it need tone contour it must be bad. I insist that recording studios make mistakes. Some of the media I use is 80+ years old.
HiFi is the dog hearing his masters voice on the old Edison and recognizing his masters voice.. That is HiFi..
C'est la vie