Hello together, because now my speakers of the BMW HIFI Professional System in turn wanted to give up the spirit I wanted to inform myself what I can do there. I honestly don’t know how to answer the topic, because I have no idea of the stuff. Questions I have, there are on the accessory market compquet offers that fit perfectly, a) of the accuracy of the fit b) Number of boxes? Do you have what? Which companies are recommended? In which price category would the Are they rather good or rather bad? I don’t want to spend much, I say right away! Maybe you have some tips. Ph