has anyone compare the he500 to oppo pm1/2 ?
I have between the PM-1 and the HE-500. I preferred the HE-500. The PM-1 was a nice headphone, though, but it was too intimate and creamy in the mids for my preferences and on my setup, which was the Lyr and Gungnir using Russian NOS tubes. Unless you want the extra bling, I would choose the PM-2 over the PM-1 and change out the pads. By doing so, the two become sonically indistinguishable. I have heard the PM-3 is the best of Oppo's releases yet, but cannot confirm since I lack experience. Also we are not talking apples and apples anymore since the PM-3 is a portable and sealed.
I would wager Oppo's HA-1 unsurprisingly pairs very well with the PM-1/2. I have listened to the HE-560s through the HA-1's balanced out and thought it was a touch bright, though still enjoyable. Given the signature of the PM-1/2, this might make a good pairing.
The HE-500 seemed more linear and balanced, more open and clear than the Oppo. Since Oppo jumped into the fray immediately with guns blazing, competing directly with other flagships, I have a lot of respect for their headphone engineers and am confident they will make a killer headphone should they persist through this first generation. By all accounts I have read of the PM-3, this appears to be the case. And the build quality of all their gear is exceptionally handsome and understated.