Good for a very high power headphone amp.Added measurements for the fixed gain mode to the review. It definitely cleans up its response. Here is the dashboard for example:
See the review for the rest of the tests.
This headphone amp is good for planar magnetics headphones, like hifiman susvara, some dan clark Audeze, etc. Not for IEMS
With planars 90dB that sinad is almost inaudible.