To me adjusting by ear means adjusting to suit your own personal and subjective tastes, nothing more. When you say you obtained "great sound" by setting up by ear, what does that really mean? Only that you found the sound preferable. But another person might find the sound obtained by setting up with a test record and other tools more preferable. Is there a sound that is "right" or "correct" regardless of listeners' tastes and preferences?
If you find the sound better by adjusting by ear, that's great, but all you're doing is tweaking the setup to suit your personal and subjective perception better, not that you actually improved anything in an objective sense. Doug Deacon would most likely come and re-tweak your setup differently yet. So all this discussion tells me nothing about superiority, accurateness, or correctness of either method in an absolute sense. It might be interesting as a discussion topic in an academic sense, but from the practical standpoint it has very little value.
If you find the sound better by adjusting by ear, that's great, but all you're doing is tweaking the setup to suit your personal and subjective perception better, not that you actually improved anything in an objective sense. Doug Deacon would most likely come and re-tweak your setup differently yet. So all this discussion tells me nothing about superiority, accurateness, or correctness of either method in an absolute sense. It might be interesting as a discussion topic in an academic sense, but from the practical standpoint it has very little value.