I also use a class D amp with Forte 3. NuPrime IDA 8, actually a class AD. Sounds absolutely magnificent. I heard tubes in all kind of setups and was never impressed, didn’t really get what the fuss is about. Those glowing tubes sure give a warm and fuzzy feeling, but sound wise...hmmm...
I will be using this to protect the passive radiators as a permanent solution. https://qcomponents.ca/McBride-WG15.html I saw in the Forte III thread that another member did the same. It's mostly to prevent my cat from sinking its claws in the driver.