I can confirm there is a hiss when no music is playing, but i cant hear it from my listening position a couple of metres away, but it may be problematic for those who plan to use them nearfield or are more sensitive to hiss than i am. It certainly isnt an issue when music is playing and the auto shutoof when there is no signal menas that when not in use there is no hiss for more than a few minutes. Having emailed Mads Buchardt i am assured that the issue will be fixed, along with an issue with the HDMI arc which occasionally doesn't recognise the signal. I have quoted his email below which also gives some information about a forthcoming Buchardt hub/streamer...
The ARC is bugged and the team is currently working on an update that would fix these issues. Should be coming very soon automatically.
The hizz would be removed soon, we already have a fix for it, we should soon be updating all the mastertunings with this fix as well.
In q1 2021 our advanced EQ should be ready, this is a pretty big deal so i can't wait for this to launch.
We already started the design on our own Buchardt preamp/hub for the speakers, the Platin hub you have now is clearly not a Buchardt product, but it gets the job done and it offers crazy good value for money, but it still feels misplaced.
It would be based on our I150 chassis and have many of the same things within the preamp section. We are planning on getting a BlueOS module as the streaming solution with it. When it's released properly q2 2021 we would be offering a full cashback on the current hub if you want to upgrade.