Kemper Amps Forum

Quoted from "schneidas"

es, I had tried this as well but it didn't change anything.
I still get a pop every now and again. But they appear to happen pretty randomly, and sometimes I can play for 30 mins to an hour without a single one..

nm

Quoted from "mikeb"

Could be that you have to perform a flash format. I could not get my Kemper working correctly until I did that (volume problems, gain, noise)

I have done a flash init and complete format of the KPA as well. Even after that it still happens every now and again.

I'm doing a S/PDIF reamp loop for these tests Chris, digital in, digital out, clocked by the KPA. I was concerned that it might be my gear, LOL but if that was the case, then the bypass test should be crackling too. I've heard bits drop on rare occasions here and there before, but not like this or on the last version. Is there something else I can try? Send me an email if you need to get ahold of me directly, as I'm not on the KPA boards every day.

-djh

Quoted from "ckemper"

Quoted from "dhodgson"

Schneidas,

As far as the solo stomp aliasing is concerned, the two are virtually identical. It's the crackling that's new - you could subtract the 2nd from the 1st, or the 1st from the second and hear the same noise ('tho the polarity of the crackle would be flipped.)

For clarity's sake, the amps in both versions crackle a bit - but the solo stomp only crackles in the recent rev.

-djh

I cannot reproduce the crackles in any version. Do you record thru Spdif?
Does it crackle when you play guitar?
Anyone else have crackles?

If you go and revisit the demo at KPA Aliasing Test Suite, you'll see three new files:

9) WQ 110 Rev 7448B - S/PDIF Reamp #1 <- NEW
10) WQ 110 Rev 7448B - S/PDIF Reamp #2 <- NEW
11) WQ 110 Rev 7448B - Analog Reamp <- NEW

Sorry I've been sick in bed past couple days, or I would have gotten this out sooner. The focus for this test is the CLICKS.

Reamp Mode........Bypass...........Stomp Only........Amp Only................Both On
9) S/PDIF.........Rare Clicks......Clicks............Short Grit + Clicks.....no clicks or grit
10) S/PDIF........Rare Clicks......Clicks............Long Grit + Clicks......no clicks or grit
11) Analog........No Clicks........No Clicks.........Clicky Grit.............no clicks or grit

I'm not going to talk about the aliasing qualities this time, just the clicks. There is noticeable clicking in Stomp Only and Amp Only mode when reamping via S/PDIF using the KPA as external clock. Likewise, the "grit" artifacts that you can hear at the beginning of Amp Only mode varies - it usually sounds like #10 when using S/PDIF, but on one (one!) occasion I got the shorter-than-usual example you can hear in #9. Thirdly, even in Bypass mode using S/PDIF an occasional sample is dropped - you can hear one or two clicks that are so brief you might not even notice.

With regards to Analog reamping, you don't get the clicks, but the character of the Grit in Amp Only is different - it's got a less obtrusive but "clickier" character though. And you can really hear the analog noise, sheesh - this is what things sound like with the noise gate completely off when not digitally reamping.

-djh

Quoted from "miles"

At 0.07 there is a click, and the crackles begin at around 0.20.

Yes, clearly audible in your audio file...

Aliasing artefacts are still there even in firmware 1.1.1 7641b