About EQ...
Accurate reproduction from the transducers to the listeners' ears , most often requires
some EQ. Let's limit ourselves to speakers for now...
Below 500 Hz ( arbitrary threshold) the room dominates> What reaches the listener ear , from a perfect transducer, is profoundly mangled, distorted and or even be absent as not heard, even absent .. yes ...There is , IMO, no way to get good bass (anything below 500 Hz) without EQ and I would add a bit of Signal Processing... something that is not the forte of analog (Fact), it must be digital, thus DSP.
It is theoretically possible to build a perfect room where rooms modes are tamed, via contraptions that are enormous (Volume are in dozens of cubic feet or meters) and complicated. Such rooms are uncommon, I am not far from guaranteeing that for the most majority of audiophiles even those with unlimited resources this is rarely accomplished. Even for those with 6 figures (USD) systems ... for a non scientific survey, go to Audiogon, look for the mega (>100 K dollars systems and survey the Room Treatments ...
We, thus, all must EQ in the Bass.. what about the rest?
One topic rarely discussed is treble falloff.. This depends on many factors .. directivity for one plays a role in it. and I am not sure highs response fall off with distance is regularly or comprehensively measured... To compenasate, I find a bit of Bump around 6 to 9 KHz make instruments and , yes, voice more alive more real, for the lack of better terms.. It must be judicious: too much and everything become screech-y, but a little goes a long way: say centered at 7 Khz Gain o.5 dB and Q around 3~4? Works for me...
Another thing : After having experienced, Audyssey MultEQ-X and, especially
@OCA scripts, so far I am at Acoustica... I will never listen to a non corrected audio system. Call it EQ if you will but .. there is no going back.
We have been lead in the wrong directions by the Audio Industry... Still today the costlier systems or components do not provide any way to correct the sound.. And in the HEA ( High End Audio ) they wear this as a badge of honor...
I can now understand why most High End Audio systems I have heard during my subjective years, rarely sounded right in retrospect: One can get to gaslighting oneself.. True!. You hear a great (mega dollars) system and cannot come to like the sound coming out of it .. Nah, it must be you..

not saying that some of these didn't sound good or right, but disappointment was more common that elation ...