Kemper Amps Forum

I intentionally played straight and sterile so as to make the noise somewhat obvious even though it's kinda subtle upon first examination, in order to bring attention to the issue... I find it more audible when I'm actually playing rather than listening back to a recording, because I can almost interact with the noise. I think more players will begin to notice it now--I got the impression that Kemper didn't know about this when I contacted them, or maybe they did but didn't let on to it until I fully presented my observation.

This noise will most likely effect players (like me) who love to play high-gain, sustaining, slow, melodic leads, unaccompanied, probably in a studio or quiet room, and want to get-off on the sonic purity of the KPA, but it turns into ants at the picnic.

Here is another sound file of the same Vox profile as my original post but with an added dist stomp which really compounds and emphasizes the noise:

Another KPA Aliasing Example

I have some dialed-in studio amps that I want to profile, but I am waiting till this problem is fixed... and I do believe it will be, eventually.

The big question in my mind is: Is this really a firmware issue, or will I have to wait for a future KPA II HD? Kemper says that they will fix it in firmware, and I take them at their word, but my instincts tell me that it's more about resolution and DSP power, which would mean, hardware! I'm looking forward to the near future when they prove me wrong. Normally, a DSP intensive device runs kinda hot, the KPA runs surprisingly cool.

Did I mention that I love my KPA?

Quoted from "audioholic"

question:

do you have a cable plugged into the monitor out as well?

on some profiles, when I am taking the stereo out, and also have a plug in the monitor out that is not plugged into something, I get added fuzz or noise...

So far I have only used the master outputs.

I tried doing what you are doing with the monitor out, and I can detect no change with the noise level in the master outs or headphone out--not sure why your getting that.

Quoted from "BRUNO"

I tried your test and do not get any real difference with or without the compressor added..now I would not say that the sound is 100% distortion free to start with but no (good) guitar amp is, even on a clean sound
Can you post a clip of this please ?

Quoted from "Per"

Does the distortion sens control have any effect on your result?

I resolved the issue regarding the clean distortion from the comp by increasing the attack up from 0. This super-fast attack time literally sounded like distortion, and increasing it made it go away. The KPA can actually make a rather squeaky-clean DI with the amp profile off... nice!
In case your curious, here is what the 0 attack time compressor distortion sounds like--the first 4 strums have no comp, the next 4 strums have the comp with 3.0 intensity and 0.0 attack time, amp off, cab off, presence all the way:

Clean Test 1

The high-gain aliasing sound as described at the top of the thread still exists though.