Hello, so the best setting in my opinion is to set the front top to 6 and the rear to 6 and the rear top to 6. Have you also updated the rears and the subwoofer? https://www.samsung.com/de...

The question is a bit older, but still:

In order to have a greater effect from the rear speakers, you can go well into the minus with the other values.
I would set the bass to -6 anyway, the subwoofer alone provides more than enough bass, so there's no need to add the soundbar.

I would also set the centre a little higher, for example. Here you can counteract the problem that voices, for example, are often somewhat drowned out...

My favourite:

Centre 5
Bass -6
Side 0
Front Top 3
Rear 5
Rear Top 6

This was also recommended via the official channels...