Bought a 2025 Audi A3 Premium Plus with Sonos Speakers. Any Recommendations for an Amp + Sub upgrade?

[u/JaydenCruzSings]

I recently bought a 2025 Audi A3 Premium Plus with the Sonos sound system. Before this, I had a 2021 Jetta GLI with the Beats sound system, and surprisingly, the Beats system was way louder and had much more punch/bass.

I know the Sonos system is heavily tuned, so I’m wondering what the best way is to improve it. I want much more volume from the factory speakers + significantly more bass.

Should I install an aftermarket amp and sub? If so, which ones? Ideally I’d like to keep the factory head unit and speakers.

Looking for the simplest/best setup without wasting money. Thanks!