Hey All, I've found a few answers I need, but now stuck. Got a 2004 with Symphony 2. It died after two days of having the car. Sounds like a bag of nails is stuck inside. How do I know if the system is amplified? (it's not Bose) I plan on upgrading the stereo with a single din Bluetooth unit. Like I've done in the A4 (massive thread somewhere) Any help would be great. Cheers G.