if the atom sounds like its bigger brother the phantom, then expect highs and mids that are not as clear as the high end monitors in the sub 300 dollar range. I compared the phantom right next to the mini monitor and the phantom souned dull in comparison.

I have not heard the m3ti yet, but ppl say the mids and highs are even clearer on the m3ti than mini monitors.

However I hear that the atom provides more slam and output than comparable speakers in the axiom lineup