Hello, in my Passat 3B I replaced the original VW Radio Beta with a JVC KD-DB622BT. There are only the two pieces of original speakers in the front doors, so no system with amplifier or similar. The expectation was to get at least as “good” sound as with the original VW radio and to have on top of it DAB radio and a Bluetooth interface. I got a grotesque bad sound, almost without depths, sounds “like out of the shoe box”. What’s this about? Is this radio model intended exclusively for use with an external amplifier? An acquaintance has in the Skoda Fabia instead of the original radio some old blue-point radio in it, there is the sound top, just as I would have expected from my JVC…