I just made some tests, and if I use a generic cable, the noise is giving 60dB SPL when my small JBL Duet (12W) are at its maximum volume.
If I use my Ortofon 6NXMPR30 cable the noise is reduced by 15dB
After changing the OPT mode so the USB charging is disabled, the noise is almost completely gone.
I also wonder if by doing this mod the noise might be further reduced: http://forum.moogmusic.com/viewtopic.php?f=11&t=15694&hilit=usb+noise+minitaur
Does anyone know if its safe to try?