On Thu, 29 Dec 2016 01:56:37 +0000, Schatzman, James wrote: >1) Perhaps it is not so much the issue of whether the cable has a >ferrite RFI suppressor but the quality of the cable that is important. Saw + pincers = ferrite core removed = no xruns anymore I guess it isn't fortuitousness and the culprit indeed was the ferrite core. >I recommend that you use a quality USB 2.0 spec'd cable. Better yet, >use a USB 3.0 cable. You are aware that the audio interface has got a type B socket? http://blog.macsales.com/wp-content/uploads/2012/07/USB-BTYPES.jpg >2) Unfortunately, USB is inherently noisy. Using a ferrite to reduce >common-mode currents in the cable is, in principle, a good idea. >However, there are potential issues. > Either or both the sound card and your computer's USB port may not > properly isolate the signal and power grounds, and there may then be > noise issues if the two grounds are not electrically the same. When > you install a common mode choke (the ferrite), you are effectively > isolating the two grounds. This should be fine, but if either sound > card or USB port are not properly engineered, there could be a > problem. You could try running a wire (16 gauge or larger) from the > chassis of the sound card to the chassis of the computer. Do not put > a ferrite around this ground wire. There were xruns, not just analog noise issues. >3) Another potential issue is the sound card power supply. >Unfortunately, almost all power packs sold these days in the U.S. are >Chinese switching power supplies which produce TREMENDOUS RFI. You >could try a linear power supply instead, although they are getting >harder and harder to find. Sure that's why I just in case purchased a cable with a ferrite core. Actually there are no issues without ferrite core. Regards, Ralf OT: Voodoo, the PreSonus inputs and MIDI in and out work with my iPad, but all output channels are silent. Here is a list of devices, known to work with iOS devices, the PreSonus is one of them, but actually it doesn't work here: http://www.wavemachinelabs.com/Support/auria-audio-interfaces _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
