As to whether they could or could not easily handle any load any B&W..., that is a very interesting question for people like me who are keen on specs and measurements, but I don't believe it can be answered without knowing the specific B&W speakers and the use case based on distance and required spl at the specified distance. For example, if I had the 802D/D2/D3 or above models, and if I listen to 10 dB below reference peaks from 4 meters, I would not use the STR, but something like McIntosh 1 kW, or higher monoblocks lol.. I never owned such B&W speakers but have read/heard about how people got their diamond tweeters damaged, presumable/apparently due to distortions being too high under their use conditions. It wasn't just isolated cases, when it happened enough times to enough people, such suggested reasons for damage might have been credible. They might have done something to protect those tweeters in recent years but I have stopped researching on B&W speakers, when I decided they are a) not something worth spending so much on, and b) they don't sound better to me compared to speakers that are much more affordable (for me). So, it is possible that amps like the STR can drive safely, not sure about easily, B&W speakers, but again that would still, as always, depend on the use case to some extent.