Using 100 and 10 ohm resistors here. I'm surprised you don't hear the noise floor without resistors. Out of my NFB-7.32 (5V output), I have to set the Krell at 2-3 out of 150. Any higher than that was too loud for me so I'm guessing you listen at a higher volume than me which lets the music mask the noise floor. With music stopped, it should be really obvious.
5/6/14 at 9:41pm