I mentioned that I wrote a discussion of the RAAL-Requisite SR1a in a separate thread. Because of its special requirements on amp, and similar requirements of the Susvara, and electrostatics (which I don’t have), it is messy to connect them up to the DAC. And I didn’t want to buy a second DAC…
This problem is not unique to the SR1a, so you might want to take a look at my solution, in two steps:
Works but a bit inconvenient:
More convenient and eliminates risk of frying cans by forgetting settings: RAAL-Requisite SR1a ear-phones