PM-1 gets 5 stars from WHAT HiFi
WHAT HiFi may have been surprised that OPPO turned it's hand to headphones but were even more surprised at how well they performed.
"Tonally, the sound is nicely balanced. The treble is sweet and sparkly, and the midrange is full-bodied."
And they didn't stop there. "They are gorgeous headphones, lavish, with attention to detail."
They were impressed at the PM-1's high sensitivity of 102db making them sensitive enough to drive on portable devices.
"We’re still surprised that Oppo has turned its hand to headphones, but the bigger surprise here is just how great they sound. The PM-1s are a resounding success. We love them, and we think everybody should hear them."