I don't own either. But it should be remembered that the M60 is smaller than the 80, but not smaller than its competitors(which I do own). What impresses me is that M60 offers a separate mid-range driver along with two bass drivers, for a true 3-way configuration. That is impressive at the price. My PSB's use a two-and-a-half config, and skip the separate mid-range, using one bass drive crossed over higher than the other. I love the sound, but don't deny that, in theory, you should get more accuracy with the dedicated mid-range driver on the M60, as compared to many good competitors.
Just a thought from an outsider.
which PSB speakers do you have? can you give me give more details about what you prefer on both speakers
