HiFiMan HE-560
The sound of HiFiMan’s new HE-560 has less in common with the PM-1 than do the LCD-2 and even HD600. A follow-up to the HE-500 model, its tuning is somewhat like applying a v-shaped EQ filter to the PM-1, lifting up the lows and highs.
The HE-560 is bassier than the PM-1, and the extra bass gives it a slightly warmer tone. At the same time, its treble is more energetic and extended, allowing its presentation a more “open” feel. The extra treble energy sounds more natural to me, but the HE-560 also appears less full-bodied (i.e. “thinner”) through the midrange. This grants the HE-560 a more “analytical” note presentation that some listeners may not find appealing. Overall, however, the upper midrange and treble of the HE-560 are more well-defined, more crisp and nuanced.
The mid-centric PM-1, on the other hand, sounds extremely coherent with its stronger, thicker midrange. Its bass is just a hair more boomy compared to the HE-560 but it has smoother, completely fatigue-free treble. The PM-1 can sound a little vague and lacking in crispness next to the HE-560 – smoothed-over is the best term. It also doesn’t quite have the same open, well-imaged presentation, but is more efficient and would again be my pick over the HE-560 for a transportable rig.
http://theheadphonelist.com/oppo-pm-1-review-comparisons-lcd-2-hd600-560/