Has anyone done the Anax mod and gone back to stock? I mean I find it weird that a headphone that has been designed for 7 years can be improved by a simple mod.
Well, I've never did that mod on my pair. However, I've heard two different pair with that mod. I will never use that mod on mines. IMO, it takes away from the soundstage, has less air, also had a veil compared to stock or the pair I have. I have mine Hardwired with an SAA cable.
While using the ESS99018 DAC and amp of the OPPO HA-1, before getting the Metrum Octave MkII and, later, the Metrum Aurix, I tried the Anax mod, as documented in Tyll Hertsens video, then tried several other incarnations, and for the same reasons stated by prepoman, I went with a "less is more" mod, following Currawong's lead, to end up with nothing more than a thin layer of self-adhesive felt covering only the flat, metal ring surrounding the driver. This brings down the brightness just a little bit, allowing the HD800 to sound stock, otherwise. But the "Currawong mod" is not a solution in and of itself for using the HD800 with "incompatible" DACs or amps.
http://tinyurl.com/qhoscrw
In my opinion, the HD800 "needs" an NOS DAC and a zero-feedback amp. I say this, admittedly, with very little experience with other solutions that could be just as viable for allowing the HD800 to retain its best characteristics, especially those that distinguish it from other headphones, while also eliminating the signal traits that "irritate" the HD800. I'm not interested in a "fix" that reduces brightness or brittle edginess or fatigue with any accompanying reduction of desirable traits like sound stage, imaging, air, and resolution.
Tube DACs, tube buffers, or inexpensive tube amps can "fix" the undesirable traits of the HD800 while degrading resolution or distancing the sound stage (i.e. Schiit Valhalla 2) and/or homogenizing the timbre of instruments and/or coloring the frequency response (i.e. Schitt Vali). I believe that only the higher quality tube amps (i.e. Cavalli, DNA, Eddie Current, and maybe a well-appointd Woo WA6SE) can retain a resolution, transparency and neutrality worthy of the HD800. A zero- or at least low-feedback solid state amp, like the Metrum Aurix or even the amazingly affordable, Class A, truly single-ended and thus, inherently low-feedback, NuForce HA-200, in combination with an NOS DAC that retains detail without treble rolloff (i.e. Octave MkII), with none of the digititis, sterility, or glare of an ESS9018 DAC, is for me, a less expensive sure thing than going with the best tube amps - with only the minimalist Currawong mod preserving the uniqueness of the HD800.
Mike