Not to contradict you because I could have interpreted wrong. I was considering buying one of these but decided the rest of my system didn't justify the purchase.
From what I've read, when you set the line level it default to 3v output, but this isn't locked so using the down volume switch reduced the output voltage. Apparently 4 clicks brings it to 1.9 volts. For safety when dac is switched off, next time it's switched on it is not at line level, and also the next time you set line level, it should be at the previous line level setting, ie 1.9 v if set as in above example