I actually had two sessions with the speakers. On my first one I played at high volume a Police cover "Walking on the Moon" by the Dutch jazz group Yuri Honing Trio. Its a well recorded piece of drums, bass and sax that slowly build to a loud crescendo. I thought both speakers reproduced snare, kick drum, sax and string bass very well, though the B & W had more natural sounding cymbal hits than the M3, which was not as defined and more splashy.
I went back in after lunch to hear female vocals and played Eva Cassidy's cover of Louis Armstrong's "What a Wonderful World". The B & W was more sibilant, more shhhhhy, than the M3 which was more natural with the female voice.
I gave the B & W the nod by a hair because I thought it reproduced percussion a bit better and I've gotten used to some sibilance in closely miked female vocals. However I would never purchase that speaker when the M3 is priced at less than a fifth of the cost of the B & W.
