It works perfectly well in my setup, I was afraid of the -6db level, but the 4Volt DM7 output at max volume into XLR gave a perfect voltage match into the RCA LFE input of my nonbalanced sub, and now I run multiple sub with one RCA sub with this device. No hum, pop sound, or any noise. Also bonus, RCA sub autodetecting signal and turning self on and off.
Topping DM7 DAC works fine as well. Running it all with Dirac Live Bass Control.