@rudolpuss No, I'm testing out/comparing two systems at this moment, the HK Multibeam 700 with surround speakers and a SONOS Beam with 2 SONOS One speaker to go with the surround sound. The reason...

Same problem here. Just bought a HK Multibeam 700 and a HK Citation One and installed it on my TP Link M9 Plus network. When I use them separately there's no problem, but when I create a speaker...