Hello, I’ve bought an Audi 80 B4 and would like to improve the sound a bit, which should be too difficult with the two front-speakers. The problem now is that I don’t want to load a sub in the trunk and also don’t want to convert anything big. The question to you now, what can you do, there are sound systems for the sky and is it difficult to move or what suggestions do you have? Please no doorboards or hat rack systems. Thanks already for your help! MfG Ralf