I'm very impressed with the sound system and having a quieter car means you hear more of the sounds! DAB, CD, SD card, IPod and Bluetooth all work well. When you get a good DAB signal the quality of the broadcast from Classic FM and Radio 2 (my main channels) is stunning, FM signal is very good. I consider myself a bit of a HiFi nut and very keen on getting the best out of any car system, but with the PHEV I will not be touching a thing..... well I may well get a DAB booster if you can get one! I am certain the drop out of the DAB signal is nothing to do with the system it is patchy in my area. The best sounds have come from using the CD and the SD card, lots of detail with some pretty impressive low base (that does not rattle the car interior no matter how loud or low I go!!).