Hello lover of the good tone, in my V70 D5 (MY02) I have the HU-603 with 4x50W amplifier (PA200) and the high performance speaker (HT-281). Subwoofer in the trunk is also in it. I am very satisfied with the sound of the system, but I have already read often that the HU-803 with Dolby Surround is the absolute listening experience. now my question: is there really an extreme difference ? I am talking now only about the difference 603 and 803 each “only” with high performance sounds prechern (not premium). from the sound this would have to be quite the same, since most audio signals are anyway only stereo. would an upgrade pay off ? I would need only the hu-803 and the center speaker, or ? thank you for every info grueße Roman