oh snap
I'm like... wait, I posted about this, have to dig that up, can you link to the post? It was this thread. 
SInce November. Since version 2020.44.10.1. 13 updates ago for me.
lol. So I was pinged by someone in PM asking for my settings
Unfortunately it seems that the Tesla Owners Worldwide group on FB disappeared, so the post is gone too. I also found that, though I used "copy image" and Ctrl+V into my post, that took the URL of the Facebook photo with it instead of copying and pasting the bitmap data, as I would expect / typically observe it doing. So, that post is now gone, and for some reason I can't edit it above anymore.
So, here is my copy of the settings above, now in 2021. This time, copied from Google Photos, pasted into MSPaint, then copied again, so it strips unwanted metadata.
View attachment 658163
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Now make Tesla fix USB media album art already. It's been, what, a whole year it's been broken now? Many new owners don't even know USB media album art used to work! lol. Relevant: USB Music - cover art
Wow, feels like so much longer! Late October, early November, it looks like: 2020.44 Official Tesla Release Notes - Tesla Software Updates - it was broken with the Spotify UI & media sources refresh. So yeah, not a year, but almost exactly half a year now
Ears, like tongues, are all different I suppose... I don't find anything particularly "harsh" myself. Had these settings (often at relatively loud volume) for at least a year now (but if my last "a year" is anything to go on, I doubt my memory. hahaha).
I played a FLAC file of pink noise from a USB drive in my Model Y. I put a DBX omni-directional reference microphone between the front seats at ear level. The mic went into a laptop running the Vertex MultiInspector spectrum analyzer plugiin to Cubase software. All speakers were active. With EQ sliders in the car set to zero, there were "loud spots" in mid-bass (around 100Hz) and low treble 6MHz. A lot of people would be happy with that. I used my system to get the most even frequency response across the entire audio spectrum (I listen to everything from classical to prog rock) and set the result so the highest setting on the car EQ was "zero" (boosts drain power amps). Flattest response settings from bass to treble: -4.5, -1.5, -1.0, 0.0, -0.5. After listening for awhile, I boosted the lowest bass setting to -4.0 (bass seems to get lost while driving).I think the question still applies. The system isn't perfect so we should use the eq to adjust for its deficiencies. Has anyone used a wave generator and record to see what needs adjusting for example? I thought of doing something like that and never did. Hoping someone has and can help.
Once that is done, yes you can further adjust to your tastes. That is left to the user
Yes, my settings ARE pretty close to yours (as one would expect). There is a Model 3 in my neighborhood; I don't know the owner, but he/she will likely want to talk about their car with another Tesla owner, and would welcome a free tuning of their sound system. So, might could happen that I'd test sound in the smaller cabin of the 3...
As you say, the bass is overwhelming while parked. I'm likely going to increase my lowest setting by a unit or so...I esp. like my classical music to sound natural and vocal lyrics to be understandable...that lowest setting can make the whole spectrum sound "muddy," so I'm not going to crank it like that.
