Back in the days of Ultrasones, Beyers, and Grado were in vogue, I lamented at the nasty high frequency peaks of many headphones. I knew that making a single driver reproduce the entire frequency range without treble spikes would be difficult; and suggested that headphone manufacturers explore multi-driver headphones, much like multi-driver speakers, where woofers reproduce bass, tweeters reproduce highs, etc. We've seen this approach very successfully implemented in IEMs, and to a lesser extent with headphones (e.g., Dharma D1000). Today we have a $249 headphone that uses three drivers. You guys can go to the 1more website and read whatever they have to say. I'm not going to repeat it. In fact, I didn't even read it. I did note on the box that 1more claimed that this headphone was expertly tuned by Grammy winning sound engineer Luca Bignardi. I will say that either Luca Bignardi is deaf or sell out. If Luca created an account here, I would still say this to his face. Note that the 1More Triple Driver Over-Ear Headphone is a supra aural on the larger end of the scale. Those with smaller ears can probably fit them inside the pads. The headphone looks like an open backed headphone, but it is not. It's effectively a sealed headphone (better seal than the TH-X00.) It's got a cool rim look out the outside. 1more should have offered different "wheel covers" for this headphone. 1More Triple Driver Over-Ear Headphone Frequency Response The bass is kind of heavy, not excessively so. The highs are bumpy, more than expected for a headphone that I assume with have a dedicated treble driver. The Sennheiser HD650/600's kick this thing's ass in terms of treble smoothness. Overall, the measured frequency response isn't too bad; but it sounds much worse than what the FR would indicate. Let's move on to CSDs. 1More Triple Driver Over-Ear CSD The most severe issues in the highs lie with the 7kHz and 12kHz ridges. (And 4kHz too, but this doesn't seem to bug me as much as @Hands would be bothered). The 7kHz CSD ridge is coincident with the nearby 6.5kHz FR null. This is nearly always not a good thing and will be audible. The mitigating factors here are that the ringing is not long lived and the overall treble energy is below the mids. Still, the combination of this and the 12kHz peak is not pleasurable. Think of mosquitoes buzzing around timbre. Definitely reminiscent of some Ultrasones, but not as bad. And finally, I've saved the best for last. Those familiar with distortion measurements will know at a glance. 1More Triple Driver Over-Ear Distortions High third order distortion in the lows has a distinct sound. There was a word in my head when I was driving to work, but alas I have forgotten it.