I sent a note to support on this matter over the weekend, but was curious to see if any users might have a suggestion for me.
I am experiencing a consistent, repeatable noise with my KPA in all my profiles (both that I've created or purchased or were provided by Kemper in their factory settings) using the XLR outs. The below files illustrate the problem. The file is just the same single note hit, but alternating the sound from the Kemper as a DI (Monitor Out - Git Studio) and going through the Kemper but with the simplest / cleanest path possible (using KPA Main L XLR output with "Master L" setting and with Stomp-Stack-Effects ALL bypassed). The noise is clearly audible in the alternating note (again, the file is just looping the same single note sampled from Monitor Out- Git Studio, Main XLR L - Master L, Monitor Out- Git Studio, Main XLR L - Master L, Monitor Out- Git Studio, Main XLR L - Master L, Monitor Out- Git Studio, Main XLR L - Master L, etc ).
https://www.dropbox.com/s/73ib4055pb4g0sc/KPA Noise.mp3?dl=0
https://soundcloud.com/kevinbenoit/kpa-noise/s-ABlhp
Turning on the stack section of the profile only exaggerates this noise (often brighter with more gain, etc).
I have 2 KPAs, one using firmware 3.2.0.11524 (which was used to make the audio file samples), and another using firmware 3.3.0.11973 (latest). Both have the same issue. No difference with changing the XLR cables, so it is not a cabling issue. I also did a system reset which did nothing to change the results. Any thoughts/suggestions on how to eliminate the noise?