Yes and no. Given that they are all fed through the same speaker, differences should still be apparent. Certainly, nuances will be less obvious, but I think my overall observation stands. I appreciate the importance of a quality PA. I have one. I find that most mic's, barring the really cheap and nasty. give a decent account of themselves through it. Sometimes, an El Cheapo can surprise you, as you found with your BM300. It's still the case, as it always is, that some will suit certain voices and instruments better than others, but I find differences are not massive in the main and can often be compensated for with eq.