The Cause of Many Stupid Arguments Regarding Tonal Signature of Headphones Allow me to summarize a story: Whitney: These headphones have a bad resonance. This headphone is elephant shit. Marv: I heard HeadRoom's pair at THE SHOW. WTF, I jumped up from my seat in agony. Tyll: My pair are not bad. That's because you listen to shitty music like Nirvana. Marv: Fuck you Tyll. My Nirvana recordings sound great on good headphones. HF Noob: I think these headphones are awesome. Measurements are dumb. HF Boob: Posts train going off tracks in HF thread. Currawong: Locks HF thread. Whiney: I just got a second pair. They still sound like shit but are a little bit better. Marv: I just listened to Whitney's second pair. I can confirm this. Christian: My pair is not bad. Marv: WTF. Your pair really isn't bad. We see this happen from time to time. For more common than people would suspect. What can we take away from this? That experienced ears can have wildly diverging opinions on frequency response (specifically treble nasties or ringing)? Unlikely. A better explanation is that these headphones actually sounded differently and measured differently from each other for whatever reasons (production variance, ongoing improvements, etc.) AKG and Beyer headphones have been particularly affected by this. I have heard stories of AKG production issues from industry insiders, but that's all I can say. They are just stories. Figure 1A: AKG K550 Sample #1 Figure 1B: AKG K550 Sample #2 Note how in Figure 1A, the K550 has significant treble peak at 7.5kHz and overall bass which slight lower in level than the midrange. The #2 K550 in Figure 1B does not have the lower/mid treble peak and the overall bass is slightly higher in level than the midrange. Figure 2A: Beyerdynamic T1 Sample #1 Figure 2B: Beyerdynamic T1 Sample #2 No explanation required. Needless to say, but the #2 sample of the T1 in Figure 2B was not good sounding at all.