My Audiophile Law regarding analogue EQ is in systems up to $10K, as an accommodation to a constrained budget, go ahead and use an EQ. In systems above $10K, where the budget is not pinched, avoid EQ.
Analogue EQ always is deleterious to absolute sound quality, i.e,. definition, resolution, etc. Avoid if possible. If your system is not pleasant, it will likely take a component, cable set, or speaker change to get it to perform satisfactorily.
Adding an EQ does not make components, cable sets, or speakers change their fundamental performance limitations. If you wish to advance an audio system, you must change these.
I have discovered a system configuration that allows tonal balance changes with zero sonic penalty, i.e., the kind of penalty associated with adding a component and set of cables.
I am not interested in debating my system building principles which have been vetted by building hundreds of systems with most popular genres of speakers.

