The D1-dual outputs 6.2Vrms on XLR if you have the volume on max according to their homepage. Its quiet high and not all Amps can handle that much. My DAC also have a pre implemented and can therefore output more than “normal” voltage with the volume on max. In the manual of my DAC they state which level on the volume that is 5 Vrms. Most Amps with balanced in can do 5 Vrms, I think. If you contact the folks at Tolaldac they can tell you exactly there on the volume pot 5 Vrms is or just turn it down a bit and see then the noise disappear.