This post is dedicated to V281 owners who use the Sennheiser HD800 as their only (or primary) headphone.
I have recently modified my HD800 headphones with dramatically positive results, and this post can be conceived to be an altruistic gesture targeted towards other HD800 owners who may also want to improve the sound of their V281-HD800 combo by experimenting with this modification.
Some background. I am not an headphone fanatic (like ghostchili) who owns multiple headphones. I simply want to own the "best" headphone that I can find to listen to classical and opera music.
I previously owned an AKG 701 headphone, but I replaced it with a HD800 headphone about 5 years ago, and I have never listened to the AKG 701 headphones since their replacement. I have only one complaint with respect to the HD800 headphones, and that relates to their excessive treble energy that makes them sound excessively/unaturally bright. I originally purchased a V200 amp about 4 years ago because its was reputed to tame the HD800's tendency to exhibit an exaggerated treble response, and I replaced my V200 amp with a V281 amp about 1 year ago. Although the Vioelectric amps tamed the HD800's exaggerated treble response, it didn't quite eliminate the problem. I was therefore thinking of replacing my HD800 with a more neutral headphone if I could ever discover a headphone that had the positive qualities of a HD800, but with a more neutral treble range. I was thinking that the new HiFiMan HE1000 may be good replacement choice, but there is no dealer in Salt Lake City, so I have never been able to audition them. I was also worried about its quality of construction. My personal inclination to consider replacing my HD800 with another headphone (like the HE1000) has basically disappeared since I modified my HD800 last week and totally eliminated the exaggerated treble response problem.
I used the Anaxilus-mod as described by Tyll Hersten - see
https://www.youtube.com/watch?t=956&v=NuhZyubY9pI
I read about this Anax-mod about 2 years ago, but I wasn't tempted to try the mod because I was sceptical that it could possibly work. What changed my mind?
I decided to experiment with the Anaxilus mod after recently reading a series of blog posts by Tyll Hersten of innerfidelity.com relating to his Big Sound 2015 experiment where he invited a number of audiophiles to participate in blind testing of headphones and headphone amps, and to also choose their favorite headphones. What really surprised me is that a number of the participants selected the HD800 headphone as the best, or one of the best, headphones - even though it is a 6-year old design that had to compete against two different Stax electrostatic headphones, two different Audeze headphones, the HE1000, the Mr. Speakers Ether and the Abyss. However, I noted that the participants who really liked the HD800 headphone all specified that their positive feelings about the HD800 only applied to Tyll Hersten's Anaxilus-mod version of the HD800. That prompted to perform the Anaxilus-mod (as described by Tyll Hersten in his video). It only cost me $15 to get the needed craft supplies and it only took me 30 minutes to perform the modification. What effect did the modification have on the sound of my V281-HD800 combo?
The audio/sound results were totally stupefying. The Anaxilus-mod completely eliminated my HD800's excessive treble energy problem. I cannot even begin to comprehend why such a simple modification (basically involving a 5mm ring of foam/felt around the perimeter of the driver) can have such a salutary/positive transformative effect. I significantly underestimated how much excessive treble energy still existed in my V281-HD800 combo, and how much better it could sound when this excessive treble energy is eliminated. My V281-HD800 combo now sounds "musically neutral". There was also no negative effects due to the modification eg. bass or mid-range colorations or a decrease in transparency or the speed of transients. In fact the musical soundstage seems to have been "scrubbed even cleaner" as a result of the modification and there is an enhanced level of transparency in the mid-treble range.
I would strongly encourage V281 owners who use the HD800 headphones to perform this modification as an experiment. It only costs $15 to get the necessary craft supplies and it only takes 30-60 minutes of work effort to perform the modification.
Most importantly, the Anaxilus-mod can easily be reversed and the HD800 headphones can be restored to their original (unmodified) state if the sound results are not favorable from the perspective of each individual HD800 owner.
Jeff.