Today i had time to do another try and pluged it in, what i had to do first was mute the loud key tones, check, next test Bluetooth connection with my Smartphone, worked, next HFL (steering whell control) - worked, CD - worked, what i couldn't test was GPS because my car stands in an underground car space, but will try it tomorrow.
2 things which annoyed me:
First the aftermarket Double-Din Frame i bought is too small, are there other options by Honda?
Second, the permanent murmur and the loudness itself, Volume 1 is as loud as 16 on my standard radio, this definitly comes from the amplifier right? It's like it's too strong don' know how to discribe it otherwise
I have made some videos while testing for those who are interested...