Purely sonically, transformer coupled output has more calm presentation, with more quiet background, and somewhat more precise soundstage. On the other hand, transformers can lack some definition at the most bottom end. Actual benefits and shortcomings will also depend on the environment.
Two new articles bring more details about the ultimate volume control used in the Model A. The first article describes the approach, and the second one brings more information about cermet potentiometers.
Check them out.
Audial quality asynchronous USB interface, with galvanic isolation, two XO master clocks and reclocked U.FL output.
TDA1541A simultaneous data, I2S / SPDIF (BNC), or PCM1704 output format. And it supports dual balanced DAC topologies too.
Premium version of Model A uses Audial made, real copper binding posts. Now these are available for separate purchase.
Even though it was discontinued in 2009, the interest in this great DAC never actually disappeared, so it had several after-runs. “DS” was its 2015 release.