I am running an OLED LG and Yamaha CX-A5100 preamp.
This is the top shelf from Yamaha, which is basically on par if not a little better than Denon, Marantz, Pioneer elite, etc.
Yamaha just released the CX-A5200, so there will be audiophiles out there getting rid of their pre-amps in favor of the latest and greatest. I got my used from a local chap and half price because he was raising funds to get the new toy. So I would recommend high-end second hand pre-amp to help with the expenditure.
Its actually a godsend that B&O makes active speakers, because surround preamps are way better than integrated receivers (amp and preamp built into one). When you get into high end audio, the setups are all huge separates to keep the signal clean, however its huge pieces on electronics on top of each other, and all complicated to set up. With B&O speakers however, the amplification is all spread out all over the room, and no amplifier is next to another! Thats as clean as it gets.
It has Dolby Atmos, and I have it configured this way....
Center: pair of BL8000 (mono splitting into the two speakers either side of the TV)
Left/Right: BL 9
Surround Left/Right: BL8000
Rear Left/Right: BL8000
Overhead/Presence: BL3
LFE: Two B&W PV1 left and right
This has been absolutely amazing, and Dolby Atmos is just a whole new level of home movie watching, and the DSP for surround music is equally impressive. Whats more, the calibration from the Yamaha CX-A5100 adjusts for the room perfectly. I also get individual PEQ per channel, to further tailor the curve of the speaker to my taste, which is key.
All the speakers are connected via PowerLink, with a 12V trigger stepped down to 5V. So when I turn on the Yamaha, it turns on and off all the speakers like any regular B&O TV or Beosystem. The Yamaha has two 12V out, but Im just using the one into a regular 6-way headphone splitter. The two subwoofers are just using RCA line sense, which is annoying as hell when watching TV shows that have little bass, the woofers keep clicking on and off. So the 12V triggered speakers are great.
To finish it all off, Im using a Harmony One remote, so control of the whole system happens on 1 remote control. The Yamaha also has an amazing phone app, which I use to fiddle and play with all the DSPs
Its good to be able to buy a processor with all the latest tech, 4K passthough, HDR, Dolby Atmos, etc. Pity B&O source units havent kept up.
Hope this helps!