I am getting humming (not really but some sort of noise that resembles a hum) from my SBM when I run it off of a BB VRbox. I am also running a Sonosax as well. Marc wired up a jack that has 5V and 18V from the same XLR out, the other XLR out has 6V for my SBM. In either case, whether I run it from the 5V or 6V jack, I get hum. Also the hum is only present when the Sax is in place running of the 18V source and the mini>RCA connection is made with the Sax>SBM. There is no hum when I run the SBM off of a wall wart so the issue seems to be related to the VRbox and not the DC to DC converter in the SBM. I take the Sax out and run it off of 9Vs, no hum. Again, the two are link via a mini>RCA and when that is taken out, no hum. The BB VRbox runs from 2 X 9V wallmarts in a series, for a total of 18V.
Any suggestions. I asked Marc and we are in the process of troubleshooting it. I figured I could pick all the TS.com'er brains about it.
ANDY