These Tesla full audio systems from Alpine were engineered from the ground up, specifically for Tesla. These are not off the shelf parts, slapped together. The heart of the system is a 12 channel amplifier, with built in DSP. This is pre-tuned, with software that was calculated off the exact specs & interior acoustics of the model Y. It is also ultra-efficient, to "play nice" with the Tesla's electical system.
12 speakers plus a 10" subwoofer. All in factory locations, with basically no modificaitons to the vehicle, even the wiring, due to its vehicle specific harness (price included)