Tom_Taylor97

Hello, New to the forum and new to Audi :) So I've had my A3 which is my first car for just over a year and now I'm looking to improve it. My A3 isn't the Bose version so the first thing I would like to do is completely replace the sound system. I have been looking at the Sony XAV-AX100 as a potential new head unit but apart from what I like I know nothing about the parts that I will need. My initial budget is around £900 but I could be convinced to up that if it'll be worth it. I had been looking at Sony speakers simply so that everything would match but I don't have a clue if they will be good. I also would like to avoid a massive sub woofer in the boot if possible. I prefer quality audio (Not a bass head) so if there is one hidden somewhere in the car that i can replace then great but I'm thinking the most likely thing for me is a sub under the passenger seat. I don't have much of a clue so any help is greatly appreciated :D Many Thanks, Tom