Hey guys, I want to improve the sound quality from the standard system in my A3. I'm thinking about getting a sony head unit as I had one in my last car and it was pretty good with sound quality, and it wasn't too in your face. But what else can I do? Is it worth replacing all the speakers? If so, what size are they and can anyone with a bit of experience recommend a good brand to go with? I'm not gonna get a massive sub, I like the boot space So other than that I don't think there's much else I can do. Would be grateful for any advice. Thanks!