Brainwavs M2 has more thick sound and punchy bass compared to PL-50 but interms of mids, and highs PL-50 has an advantage, they produce clear mids and high tones, but some what not quite thick sounding, as bass was in a minimal side, only the base drums can be heared clearly, but the snares and tom toms sound thin,, which is the M2s has the advantage, as they represents the snares more thick, M2s represents mids and lows very well, but lacks the details of highs, PL-50 represents mids and highs more accurately and detailed,, compared to M2s but lacks the thickness of lows (drums, base) which M2 does best,,