My 300B-6SN7 headphone tube amplifier, which I received yesterday, is also capable of driving the Horizon.
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Review’d the Retune , update from my previous March Review
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The site lists Horizon as 25ohm 89db, yet Z is quoting 16 ohms 89db. 16 ohms was the original posted spec, so… which one is correct? Granted I am not surprised by them being power hungry either way. I guess when I have the opportunity to purchase a pair I will have to A/B Mjolnir 3 vs power amp mono blocks. It would be the 2nd headphone I run off the Gjallarhorns.
Would not use a class Damp with headphones, goldensound ran some tests and it indices extreme noise in the high treble range that could be damaging to the headphone.
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16 Ohm was the original spec and the final version is 25 Ohm. Everyone got the 25 Ohm, only the prototype was 16 Ohm.
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I might see if I can swing purchasing a pair early next year if they are still available at the time. I am paying off my mortgage in January, and then buying a Yggdrasil (I know priorities right 
). So maybe a few paychecks afterwards I can swing it.
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Decided to switch to a single Gjallarhorn (my original one) to power Starry Night this morning to see what they difference is. Some caveats: different cables and burn in periods. Interconnects used:
https://www.amazon.com/Foot-Balanced-Microphone-NC3MXX-B-NC3FXX-B/dp/B00VFGUCHY?ref_=ast_sto_dp (they are sold out of the 2 x 1.5’ i purchased)
Noticeable difference right away. A little more detailed, slightly sweeter vocals, a little more open (not night and day but there), and overall more natural sound. I still have to play some bass heavy tracks to get a feel for those differences, but for acoustic music it pairs quite well.
Someone on head-fi actually asked me for some info recently regarding powering Starry Night via a speaker amp, and I am glad I told them that they should stick with a single Gjallarhorn if they wanted to go that rout.
Now I really want to try Horizon on this setup, lol! 
Edit: I will be trying Moonlight with this chain as well to see if I like it on Gjallarhorn any better than I did before (didn’t prefer it on a speaker amp before).
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Playing Inferno on the Starry Night right now, and it can definitely bring the bass still even using the single amp. One thing I did notice on the mono blocks is that it caused some resonance on that track, with slight distortion if I turned the volume up past a certain point. I might use the 2nd Gjallarhorn at my listening chair once I decommission my BF 2/64 & Soloist 3XP from my desk setup. The 3 pieces together will make up my listening chair setup.
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Congrats on the mortgage!!! 
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I know I post a lot of Starry Night comments in this thread, but I have yet another update in my Starry Night v1 powering saga, 
. Just going to post the link to the comment I made in another forum.
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The Horizon sounds really good and has a wide soundstage. However, it uses a lot of volume. It seems to be used more than He6se. Of course, it wasn’t a big problem in my amp environment. Yesterday, I asked a user who uses the same amplifier to compare the drive between Horizon and ModHouse Tungsten(Double-sided driver). He said Tungsten is a little easier to drive.
P.s. That amp refers to the Arte HPI 300 vacuum tube amplifier.
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Lol, that is an interesting statement, and I am sure there are those who would feel some type of way about it. Tungsten vs Horizon power requirements that is.
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So… now the new Question will be “can your amp drive Horizon properly”? As I will most likely get it before the Tungsten, that will be interesting given the amps I have on hand (Mjolnir 3, Gjallarhorn, and Soloist 3XP /w supercharger).
Edit: Right now my Mjolnir 3 is on high gain, push/pull mode, and set to 12 o’clock on the volume for a live recording I am listening to at the moment.
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I have two amps. I use a transistor amplifier accurate hpa-a1000. And I use Arte HPI 300 as a tube amplifier. However, in the case of the Arte HPI 300, it is unlikely to be of much help to others as only 5 units of the vacuum tube amplifier were manufactured in a small workshop (AVAC Audio) in South Korea. In the case of accurate hpa-a1000, the sound level I hear appears at about 2 o’clock on the volume knob in High gain.
I used a translator, but I’m not sure if it translated well. 
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Interesting, with Starry night I hang out between 9 and 12 o’clock on my Mjolnir 3 depending on the track. Maybe I have a chance at driving the Horizon with Mjolnir 3. We shall see though.
Edit: The translation seems fine to me.
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Had a single sided tungsten, they would be about the same to drive on my chain.
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Z just dropped a video in which he claims that the new Topping stack can drive Tungsten. I wonder how it would pair with Horizon.
thought he said he clipped it to the point of the amp power cycling in his last vid lol
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You are correct, I forgot he used it in that video. Lol
So SJY headphones are harder to drive than Tungsten as stated earlier. Well, there are always Schiit solutions to that problem.
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