Honestly, it still sounds great. The next upgrade on the list is speakers anyway, LOL!
That’s another subject for sure, but it still involves the new speakers’ in-room response (FR).
Sure, you can run ARC again and it will probably sound good again.
But the same question remains - in the back of your mind, does it bother you not knowing how your speakers actually truly measure in your room?
What if you paid more money for your new speakers and they actually have a worse in-room FR?
Which begs the question - is the EQ just as important as the speakers? Can we take any good speaker and use EQ to get +/-1.5dB or +/-2dB? If so, why pay $10-20K for Room Correction or $20K for speakers (other than for dynamics, aesthetics, pride)?
For example, say you bought some $20K speakers that had a great outdoor/anechoic FR of +/-2dB. When you put these $20K speakers in your room and ran ARC, the speakers still sound “good” subjectively. But what if the in-room FR was actually truly +/-6dB?
Even though they sound good subjectively, you could still be missing some finer instrument notes that you should be hearing from $20K speakers.
If you could confirm for sure what the in-room FR is, you could do something about it with other room correction software or manual PEQ to get your $20K speakers to be +/-1.5dB.
Or do you just assume and accept that ARC is already doing something good enough because it sounds good enough?
For many years I would just tell myself that ignorance is bliss - if the speakers sounded “good”, they must be good enough- who cares if they actually measure accurately or not.