When I designed Santa Fe Center Studios back in 1995 (oh, the good old daze) Doug Geist, the owner, and I listened to every available main monitor speaker available under $12K / pr. The KRK mains that were popular at the time were literally one of the worst loudspeakers either one of us had ever heard! Urei monitors were too old school with their Altec 604 Time Aligned drivers. Westlakes were awesome, but well beyond the budget. We settled on these:
https://www.genelec.com/1238a They did no harm, BUT they were a tad veiled. I went into them, replaced all of the TL072 op amps and a bunch of capacitors. They were transformed in their ability to communicate the mix. Interesting thing is that when the frequency response captures were input into ProTools they were virtually identical. The noticeable differences were in low frequencies. The high frequency deviations were less than 0.05dB. Clarity, transparency, micro dynamics were at a new level. The ability to "communicate" the performances made all of our jobs MUCH easier.
Frequency responses are 2 dimensional representations of a multi dimensional reality.
Or, something like that... 😁