I tried the Solitaire T at Axpona. They were smaller than I expected but nice and comfortable. The sound very nice but what turned me ayas from them was the lack of power.
I was needing to take the volume almost all the way up to get a decent level of sound. Based on what the person there told me that was most of the feedback they were getting. Too bad because otherwise I would seriously consider them.
That's true depending on what mode you run the Solitaire T in.
In USB-C mode to most devices, current firmware is locked to lower volume and capped. I believe from owners in the
Solitaire T thread that iOS devices fair better.
In Bluetooth modes, volume is significantly louder after the +3dB firmware update, but may not be enough for all users.
In my case, it is sufficient for commuting and untethered usage, and Bluetooth HQ mode (ANC off and direct decoding via ESS ES9218P chip) is incredible in quieter environments.
Regarding volume in ANC, it's great for louder environments and more than sufficient alongside passive earcup isolation, but won't compete against Apple AirPods Max or Sony WH-1000XM5. However, the latter two cans have more technical engineering for ANC, especially mic count (WH-1000XM5 has eight mics for ANC, and two for voice), whereas Solitaire T has two for ANC only and two for voice. The key difference here, however, is T+A engineering of ANC is to its voicing, to closely match its other modes, something that few headphones have achieved; Mark Levinson No. 5909's are the closest that I am aware of.
Wired mode (with wireless electronics bypassed), either single-ended or balanced, volume is, of course, a non-issue depending on the amplifier you use.
In my case of using the Solitaire T, I enjoy the voicing similarity across all modes, but vastly prefer using it in balanced mode with my FiiO M17.
Just as an aside, T+A Solitaire T headphones are wired balanced internally, and have a single 2.5mm TRRS earphone cup connector. If you purchase the cans, it comes with both single-ended (3.5mm TRS) and balanced (4.4mm) terminations.
Hope that helps give context from a user