I am a new owner of 2020 V60 CC with standard high performance audio system. Looking at the Volvo USA website, it says when describing High Performance Audio system on the car: "For an even richer and deeper bass sound, there's the option of an extremely powerful air-ventilated sub-woofer that raises the total output by 225 W."
What is it? Is it something extra that can be enabled or added to the high performance audio system? It doesn't seem to be harman/kardon audio system because there Volvo claims 600W (versus 330W+225W with high performance audio with the option)?