For Audiophiles using Lossless files: If you are after a more natural, balanced frequency response and approach what is obtained pretty easily with flat EQ settings in the Model 3 Premium Sound package, Try the Following in the Model Y Premium (which needs considerable EQ to get there):
Sub : 0
Bass: -5
Mid Bass: -3.5
Mid: -2
Mid-Treb : -.5
Treb : + .5
Important to keep Immersive to Normal. ( I leave Auto on but frankly havent seen that do anything yet. )
Adjust Listening balanced from Neutral position (which is way too forward in the Y) to the forward first crease in the back seats (line that goes across the seats). There is a 2nd line in the back of the cushion, that is too far back, and you will lose good imaging and the frequency balance will be off -- plus drastic reduction in gain. So if you get the Front/back balance exactly in that spot of the front crease, these settings will approximate a rewarding experience for average height drivers of the Model 3 experience with flat EQ. If you dont adjust front/back balance the attenuation is not steep enough in the bass to compensate for some of the resonances in the cabin/door interfaces, and the high frequencies will be too sharp. Plus you will lose the holographic effect the model 3 has with the image floating that is lost with default Y soundstage.