After giving my ears a nasty dose of tinnitus and noise-induced hearing loss using the hd800 with various amps, I've reverted to plugging them directly into my iphone 5 headphone jack. Works surprisingly well for me - the iPhone's 1v output drives the hd800 to 102 decibels, or way louder than I...

They are flat when measured at 6.5 feet in an anechoic chamber.  Obviously I don't live in an anechoic chamber, but I've listened to the speakers in well-treated rooms and the sound is pretty similar from one room to another - no differences stand out like the treble spike in an un-EQed HD800...

I disagree with the view that the shrill treble on the HD800s is a product of the recordings that are fed into it, for two reasons. First, my speakers have a flat frequency response curve. When I listen to most recordings on them, it sounds like live music. Less so the HD800, unless I EQ it to...

I almost returned my HD800s over that sickening effect of extended exposure to its treble, but EQing the 6khz-10khz band down 3-6 decibels (which brings it much closer to the HD600 curve) solves the problem for me.  Without the EQ fix, I would much rather listen to my PX-100s.  In the HD800's...

Yeah the NAD really works well with them.  The NAD with my speakers also serves as a pretty easy reference point for neutral frequency response.  I've spent the past few days tuning software equalizer settings for the HD800 to match what I hear out of my speakers on the same amp.  I don't have...

Thanks.  It looks like the M-Stage HPA-1 is available for $230 on Amazon - is there a significant sound quality difference?

Got an open-box HD-800 today for $1200 and couldn't be happier.  I had been looking for a headphone to keep my wife from complaining about my listening too loudly to my living room speaker setup, which is an NAD316BEE with Paradigm Studio 10 bookshelves and which suits me perfectly.  In the past...