Servus Elchfreunde, my sound system doesn’t really give you what you want. The HU-803 I have a lot of bad reception, but I don’t know if the antenna is integrated into the rear side pane, works or does anything good at all. The rearmost boxes (case room) have 0 sound quality and crashing ahead Can the boxes slow down after age? Which ones do I have to install or are there alternatives that fit in instead of the old/original ones? What can I have such a bad reception or how can I fix such a thing? To think about a Bluetooth system, which is supposedly controlled via the CD changer connection. But I’m lay open for experiments, rather acting according to house knowledge and grateful for every tip/recommendation. LG a Tyrolean elk