I hear the Burson HA160d is a great choice.
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My favorite for my HD800s is the Singlepower headphone amp with 6SN7 tubes installed.
A Singlepower would need to be purchsed used. (and a warning about the 'all over the place' quality of Singlepower products. Some were made in a questionable manner, with point to point wiring (no circuit boards), wrong caps, or inferior transformers.. etc. So IF you went for one, you need to see a photo of the interior of the EXACT one you are buying. If it is really nice and orderly, with beautiful wiring and a full circuit board.., great, if it is a rats nest, then pass it by.
The second choice i use is my phone output on the Bryston BP-26 preamp.
I also own a Rudistor RPX-33 mk II and do not use it with the HD800s. They both emphasize the upper octave a bit, and even though the sound combo is the clearest of any i have ever heard, and I can hear stuff on Cds I never knew was there.. it is not a great match up. (It may be a power problem, I have just not experimented enough with the Rudistor, i use several powerlne conditioners, and the Rudistor/HD800 combo may be best without one. never did bother to check it out.)
Then i own a Lil' Dot mkIII and it is a decent headphone amp. Ditto the TADAC i own.
I also own Beyerdynamic DH990, and Sony diamond diaphram earbuds, and a 25 year old pair of Stax electrostatic phones.
You should look at Head-fi.org for more info. I use a Bottlehead Crack with great result with my HD650. I know they are not 800 but its all i can afford. Anyway i have try some SS amps and for sheer musicality tubes are better. I havent tried the HA-160D but its a very good dac/amp from what people are saying. With SS my 650 sounded bright and digital, but when i tried the BH Crack, it was music like it meant to be.
So Far I have tried my HD800S with my Mal Valve on both the 8 ohm and 32ohm settings the 32 was much more balanced sounding, It sounded great somewhere half way between the Stax 007 and the LCD3. It sound very natural with a rich and prominent midrange, the treble is a little too much, not bad just a little much and the bass is all there but a little shy.
Now I'm listening to the HD800S with an original Krell KSA 5 fully recapped and upgraded, WOW they like current! They have no shortage of power with either amp both are far more power than the headphones could possibly take but both amps or the headphones rather sound a little congested when pushed hard on complex music and I know for a fact its not either of these very powerful amps. With the Krell they sound even more alive, transparency is about the same as the Mal Valve but the frquency balance is even better with the Krell, strong assertive fast bass and blends perfectly with the midrange and slightly more balance treble. I'm guessing the Schitt Audio Valhalla II will sound awesome with them. Right now I'm swapping some caps out in mine; with upgraded tubes it's an extremely impressive amp very close to the Mal Valve (with upgraded tubes that cost more than the amp lol). I think the Krell is the king relationship wise here, it just sound so right and musical and very punchy like live music and very close to the Mal Valve transparency although I think the tube amp has an edge there. The krell sounds limitless, it has absolute authority over the HD800S, the notes last forever, there is layers and layers of depth and complexity it just sounds lush and gorgeous. The micro and macro dynamics are as good as it gets with this combo.
All listening was done with the DCS Debussy playing fully uncompressed high bit rate files, the amps and Digital have separate power isolation transformers running off a dedicate 20amp line. Analysis Plus Solo Crystal cables were used throughout..
I use Sennheisers own amp the HDVD 800 which I find extremely versatile in that it is not just a headphone amp but also a complete pre amp with spdif in - Bal in - Bal out - RCA in- RCA out - USB in - AES in . It also has a pretty serviceable DAC in it. The thing I like about it though is it a fully ballanced unit and if you treat your headphones to Sennheisers fully ballanced lead it will lift them to a whole new level ( I mean major improvement ). I find the unit so good I even put my Gryphon Mikado through it and the wealth of detail it produces is incredible. It is expensive but I find it to be very accurate.
I used to have a Bryston BHA-1, connected to my previous McIntosh C50 preamp (not enough "umph" from its built in preamp) with the balanced connectors. I don't use headphones very often, so I sold the Bryston to someone who really enjoys it.
When Tidal started streaming MQA, I purchased a Mytek Brooklyn DAC and the headphone amp in that baby has a LOT of power! So, it's become my headphone amp of choice, powering my HC800's.
I have had Burson Soloist w/ the warmer of the 2 dacs offered.
I found it a bit bright w/ LCD-X
Used the McIntosh MHA100, and it was great, but more expensive
than I felt was a great value, so I sold it and broke even.
I now use the Bryston BHA1 with a Bryston BDA2 and it is a great great match for the LCD-Xs and I'm sure would be also for the Sennheisers...
I've heard good things about the Ayre Codex.
If you don't need a built in DAC, you might look at Wells Audio's headphone amps......have heard them at RMAF and they are probably the ones to beat overall in my opinion.........if you go tubes, I'd go Decware Taboo