Hello,
When it comes to speaker upgrade in a Tesla (Model S, X ,3 or Y) we believe the best option out there is our speakers.
They were designed by the same engineers who helped to create the Da Vinci DAC and OSCAR XXI from Light Harmonic.
Please check our store:
Tesla Model S Premium Speakers| Light Harmonic
Also, Youtube will offer plenty of installation videos with tips on how to install these speakers.
Light Harmonic Tesla
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