kinda odd. When I installed my NVX sub, I installed my line level converter on left side of dash in a space that was perfect for the small converter. (Left of steering wheel in this pic where it says "amp". Thats where my converter is)I was less lucky.. upgraded today, nothing was mentioned when I picked it up but the first thing I noticed was the sub not working. Went back to the Service center, they said they didn't even notice it, but with the MCU replacement the default amp was also replaced; therefore the sub signal needs to be reconnected somehow - which Tesla won't do for aftermarket upgrades, I'll need to go back to the installation company to see what they can do.
A bit disappointed since it was in fact a Tesla sales rep who recommended me back in 2017 to get an aftermarket audio upgrade (the Tesla audio upgrade was EUR 5.5k back then and included other things I wasn't interested in).
Other than that, happy with the upgrade, it's nice to have a workable MCU again instead of a slow laggy screen in a modern car like the S!
Tapped into speaker wires for my signal from same side, floor level just ahead of the door behind kick panel. Close to dead pedal area. I needed nothing from the MCU area for my install nor did I need to touch/tap into the factory amp for anything.
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