Your amp will be seriously underpowered for the intended application. Nothing wrong with class D amplification, in fact I prefer it with my B&W along with a tube preamp. IME 200 watts would be a minimum figure.
A loud listening level for me is in the lower 80db range with peaks in the lower 90 db range. Normal listening levels are 5-10 db less than that. So, the power required is not for head banging sound levels. The power is necessary for a balanced sound output. Not enough power results in thinness and over- emphasis of the top end. I currently have N802 and Concept 90 in two of my systems so I’m not talking theoretically or repeating ridiculous crap like you need Classe or McIntosh amps to match B&W.
i