Music bleeding at zero volume

Trying to understand why music continues to play when I have the DAC/pre turned all the way down...

When it’s dead quite in the house - I don’t even need to turn up the volume from zero. It plays loud enough to hear comfortably. Using XLR interconnects. 

Sim Audio W5 power amp
Mertrum Acoustic Jade pre/DAC
bluesound node 2i
Von Schweikerts VR4 floor standing speakers