I received the Hedd D1 yesterday and have been doing A/B comparison with my HD6XX since then.
In a nutshell: Is it a better HD6XX ? Sometimes, maybe most of the times. Is it a 2-3x the price better ? No, i think it should be priced around 400-500€.
Few preliminary notes:
- Cable is maybe the best I experienced in this hobby. The case is great too.
- Build quality, serviceability and 5 years warranty are great.
- Comfort is good, but i find my HD6XX more comfortable.
- Very neutral, and very natural timber, even more than the HD6XX. I kept thinking if I was to listen the piece live, that's how it would sound. Most natural headphones I heard to date.
- More separation and more 3D stage, instead of the HD6XX wall of sound. Which I think is what makes it more natural to me. Less 3 blobs effect, but not huge soundstage either.
- Bass extend lower, and is "quicker" than the HD6XX. So there is this feeling of more attack. But it doesn't necessarily punch harder.
- More revealing in the treble without sounding harsh of fatiguing to my ears. It's less relax than the HD6XX though.
==> Overall it removes a bit this HD6XX "veil" while keeping timber and improve on the dynamic and bass.
Which brings us to the issue of this headset. It removes the veil of the HD6XX!
The more I try different headphones, the more I think this veil is what brings this "lushness" to voices.
So while I prefer the Hedd D1 for instrumental music by maybe 10%, as soon as there is voice, especially female, I prefer the HD6XX by 30% (if that makes sense).
And even with instrumental, it's not that I am dying to use the D1 instead of the HD6XX. It's simply not enough of an upgrade.
I don't see the Hedd D1 being able to replace completely my HD6XX. And I start to believe it is simply not possible to have both more separation (which is what i was looking for) and the voice lushness in one pair of headphones. Next one I want to try is the Focal Clear MG. If this doesn't do the trick, I'll give up on trying to upgrade the HD6XX.
I could see it becoming a reference in the professional world though.
Testing is still ongoing and I may change my opinion in the future.