Though with the SJY, I find the slightly warmer and more natural sound more inviting for long listening sessions. Photograph: Martin CizmarBecause of that, these headphones feel more like a carbon steel pocketknife in the hand than a pair of ANC Bluetooth headphones. While the Harman Curve is controversial among enthusiasts on message boards, it’s been widely adopted by headphone makers who strive to get their stock tuning on target. The SJY line has four models so far, with a fifth on the way, all made by Yin himself in Houston. But for me, it’s as close to a perfect pair of headphones as I’ve ever owned.