B&W 800D tweeter issue

Morning folks

I seem to be having an issue with both tweeters on my 800D’s. I have two Classe Amps and a Meridian V818 DAC.

It seems strange that both tweeters have stopped working at the same time, which leads me to believe that its an output/software issue rather than hardware. Any advice on how to test this so that I can start to rule out certain issues?