Stick with the TT2 then. If you ever want to upgrade above a TT2 (as a dac) though you will have go the separate amp routeI put a lot of energy into trying to compare the sound out of the TT2 directly with the sound while the XI AUDIO Formula S is in between, and in the end I didn’t find out much about the difference. Still, it’s all good news in the end.
It was immediately clear that the Formula S sounded differently but it was very hard for me to understand what exactly the differences were. These ridiculous scenarios repeated a few times:
In other words: I had a hard time understanding what differences I should focus on when using the TT2 directly versus using the additional amp. Either the differences are too subtle to notice after the 15+ second breaks, or my listening is too untrained, or my hearing is crap.
- In a specific track I find the music/bass/voice/soundstage/whatever through the Formula S amazing. So I switch (15+ seconds), and listen to the same part again directly from the TT2. And the damn thing sounds at least as amazing! In other words: the quality I found remarkable is independent from the amplification used.
- I find something ugly using one device. I switch, and the issue is there on the other device too. So it’s an issue either with the recording or the rest of the system (and not the amplification parts).
I asked my family to help. Unfortunately each of them only tested a single Billie Eilish song, but here it is:
So I spent additional hours, tried really hard and went through a lot of music. To some tracks listened over ten times to be sure (e.g., Lumerian by Soen). And still I could not understand what exactly the differences were. The sound of Formula S (connected via inakustik premium audio RCA interconnect cables) sounded slightly differently but could not say how exactly due to my untrained ears and the 15+ second long switches. And the TT2 had a little bit more “clarity” or “transparency” which was expected. It wasn’t a critical difference though that would drastically change the enjoyment of the music for me. In other words: both are great.
- My wife liked the sound via the Formula S better, even though she didn’t want me to buy yet another black box for a lot of money (and I didn’t even mention the Powerman). However, I have to take into account that I forgot to make sure that the volumes match for her listening.
- After careful listening our 14 year old could not decide: “Both of them are pretty good”, was the judgement. Fair enough.
- Our 17 year old found both great but slightly preferred the sound directly from the front SE of the TT2 as it had slightly “more clarity”. I was really happy to hear that as this statement fully aligned with my perception.
The bass situation was really puzzling to me as I saw some people complaining about the lack of bass on Abyss directly from the TT2. I worked very hard to reproduce this issue. Listened to a lot of bass-heavy music, including a lot of metal but in the end I failed: to my hearing the front SE jack from the TT2 was producing just as much wonderful bass as the Formula S. This is completely against my expectations and I cannot explain it. I don’t think my hearing would be so bad that I couldn’t judge this but I cannot exclude this possibility. Or is there a significant difference in my setup? I wish I could invite those who missed the bass on Abyss from the TT2 to a joint audition and find out together what’s going on.
In the end it’s a win-win situation:
¯\_(ツ)_/¯
- I’m positive that the Hugo TT2 is powerful enough to drive the Abyss AB-1266 Phi TC headphones, even from the front SE jack. This result is against my expectations, and based on other’s reports I have worked really hard against it, but I have no other choice than trusting my experience. This is good news for me: I don’t have to add another component to my audio chain.
- On the other hand, the Formula S sounds like an excellent amp for the Abyss AB-1266 Phi TC headphones, even without the Powerman. It would be a strong purchase candidate for me if I had a DAVE which reportedly doesn’t have the power to drive the Abyss AB-1266 Phi TCs directly.
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