Now that I have enough budget, I am seriously considering purchasing the Zana Deux SE for my TH900. From what people have said, it seems like one of, not the best headphone amp for the TH900 with exceptional clarity and an expansive soundstage, sounding more like an ideal solid state albeit being an OTL tube amp with unbelievably low output impedance to drive this low impedance headphone effortlessly.
Could anyone elaborate on their thoughts? This would probably be the end-game for me so I need to choose carefully.
What you said sums it up.
Shines in clarity and detail, very dynamic sound and the most expansive soundstage I heard from any HPA. If PRAT does exist then this amp got loads of it. It doesn't sound like the stereotype idea of a tube amp at all and it does sound like what you would imagine a top SS amp would sound after reading raving reviews of the best among them if that comparison makes any sense to you.
I had the Zana a D7000, LA7000 and various AT's, all as sensitive low impedance cans as they get.
It wasn't the best amp for the D7000, it was my best amp period.
By the book you need to put it on the low impedance setting, choosing high only makes it louder but the amp stays as clean as on the low impedance setting. You'll be playing loud with this amp, trust me.
Comparing it to a SS amp feels like comparing my stereo speakers driven by my Marantz PM-KI Pearl vs. the speakers B output of my Pioneer surround receiver to me. Gone dynamics, flat sound, no life. In case of a SS HPA vs. the Zana it's not that bad as with the speaker amps but you get the idea. I felt like a lot was missing when switching from the Zana to my SS amps.
If you have the chance to do so try before you buy though, that's always best.
In any case TH900 + Zana is what I would consider endgame.