He500 bright? Ru kidding? .if they are bright..ur head will explode hearing the he400,he6 or grado's with my 337 they sound plush and velvetly..with emphasis a bit on mids..for me best balance..imho but i think it has to do what amp, what source or even what cables u use..for instance i changed the standard silver cable for a copper cable from DHC..
No, it isn't. But I think the critical thing here is where the peaks occur and the hearing ability of the person commenting. I don't hear the HE-500 peak, not surprisingly as I'm 66. A younger person would. The HD800 peak occurs 3khz down, and thus is more significant to more people. (You know, I have a feeling that if Sennheiser could just tame that peak a litle they'd have a world-beater on their hands).
This all goes to show you how different we hear things. I for one find the HE-500 can be a tad bit hot in the treble at times. I call it sparkly highs. On the other hand the harder to drive headphones in the HE series such as the HE-6 and the HE-5LE does not display these sort of highs - this is in my humble opinion. I would love to hear the HE-4 to see if it as this as well.
As ardilla said - amp selection may play a part in this as well. I for the life of me can't get my HE-6s or my HE-5LEs to sound bright compared to the HE-500s.