I am really disappointed of the bad sound quality of the standard sound system. Just got my new Octavia RS iV yesterday. Unfortunately I had to buy the car from stock. Otherwise
Canton Subwoofer - Skoda Octavia Mk III (2013 - 2020) - BRISKODA
Skoda Octavia Mk1 1U 96-04 1.9 OS right front door speaker 1U0035411 A | eBay