What about active noise cancellation? My $200 Sony headphones knock airplane noise down a lot. I use it on long trips in our RV. The Model 3 already has a microphone installed. Could it just be a software fix? As we always told our IT guys "How hard could it be? It is just typing"
I don't think it's the proper MIC to do the job. My Jeep has 4 Noise Canceling Mic's one in each corner of the headliner.
The Phone MIC might not have the low frequency fidelity either.
It might be possible though. I doubt it would be great since it wasn't designed with it from the get go.
Some advanced systems have sensors directly on the suspension.
I've added now
Front SunScreen
Rear SunScreen (on the way - Model S Sun Screen Temporarily)
TuxMat Frunk Mat (Over OEM Carpet Mat)
TuxMat Trunk Mat (Over OEM Carpet Mat)
TuxMat Lower Trunk Mat
Thick Blanket stored in Frunk
Maxpider Cabin Mats Front and Rear (removed OEM Carpet Mats for good fit, I debated keeping them under)
Michelin Xi3's Snows (Quieter than OEM 18" Primacy)
RPM Wind Noise Gasket
Tested Blocking Rear Deck (I think it did help but killed some bass and worried about poor ventilation and removed)
I think these all combined have helped a lot. Cabin is dead silent up to 45 MPH.
At 65 MPH on most roads it's excellent. On some coarse pavement at 65 MPH modest tire noise still cuts through, not bad but I've had better. Without accessories above I thought my head would explode on a long stretches of course pavement.
I'll be curious how OEM 18" All Season sound again in the spring. If I find it bad I might look for other tires.