Hi am still new here and I just got through it (on your recommendation and already bought) 2 pieces Next AL20 Subwoofer behind the ski bag of my E39 I have the feeling, however, that also on the front system what has to be done (the heights are a bit “thin” therefore the question – what do ? original are installed: front in the doors below each a woofer (13cm), next to the ventilation grid a midranger and in the mirror deck a tweeter (25mm) what can you recommend ? does it have to be a three-way ? (actually not or?) I want to drive the whole over my original BMW Naviradio, which should provide if the true is about 80watt per channel. maybe also what about Next ?