No , but I have used a similar approach using a 10K stereo pot of good quality between my Dac and my Hypex . The WiiMs digital volume control sounds better. I had to try it though, because I wanted to know the quality of the digital volume regulation in the WiiM and I wanted to test a passive pot to see If it could be any better. I also had bad memories from my former Yamaha wxc50 that didnt sound really good when using the digital preamp.Have you looked at this?
All my doubts dissapeared when I later compared the WiiM pro/Rega dac R with a Linn klimax DS/0, using digital volume control on both players directly into my Hypex power amp. The digital volume control in the WiiM is very good sounding .