that is very intersting, we have to bring up this thread again! Please give us some update/news Christoph Kemper!
I cant check samples now...but did you u only add the eq in the x-slot or did you also try to add that eq after mic before returning back to the Kemper in profiling mode? Im curious what would happen...
All eqing I did was in Cubase, not on the Kemper. Didn't try EQ on the way in, that may make a difference but I suspect that the Kemper would still kind of flatten it out.
Thanks for these words, Gianfranco! Unfortunately I haven't heard anything more from Kemper about this, and with some more updates out I can only assume that it's not a high priority for them to try and fix it.
With all these reports from people saying it sounds different after the update, I really don't get why nobody actually performs a test to give Kemper a better clue of what they're talking about. Run a DI through a rig in 2.01, run the same DI with 2.1, post results.
Personally I'm waiting with the update since 2.01 is working ok right now and I don't want to take any risks at the moment; otherwise I would have ran a test myself (and the ones that followed my "can't get my profiles close enough" thread know I would, hehe). But I think it would be very helpful for the whole Kemper community with some tests to try to narrow things down!
Any news?
Haven't heard back from Kemper about this yet, no.
A related question: I just sorted out two FCBs for the backline for a band I work with. They work fine but I think the expression pedals could behave a bit better.
Actually one of them doesn't seem to work right - if it's used for wah it seems to do most of the work in the middle position while heel and toe areas seem kind of unpredictable. I have calibrated it but that didn't change much, and I have tried different wah settings. The other pedal works just fine, too. Is there something more I can try? Since I saw now that they're optical, can it be a dirty lens or something?
The other thing is that the volume pedals feel a bit aggressive. Lots of change up to middle position and after that not much happening. This goes for both FCBs, and both have been calibrated. I tried changing the volume pedal range on the Kemper but that had the opposite effect. Is there something else I can try?
I just did this as a test in ozone - top is kemper profile, bottom is a boogie I was profiling... they aren't 100% but pretty damned close!
That's VERY close indeed, yes. However, from the waveforms of the tracks, it looks basically that it's just one chord struck and sustaining for around 9-10 seconds, correct? I get similar results in cases like that - the real difference start showing with more playing, some palm mutes included and so on. Could you try the same thing again with more "playing" and not just a sustained chord? Best is of course if you first record a DI signal and use that when you compare, so you have the same signal in both cases.
the kpa sells itself capturing amps accurate, if there are a few frequencies that are a little off, that's fair game to discuss. maybe something changed in the many FW updates
(runs for cover)
Sure, if they can get even closer, who'd complain?
That's exactly why I ran the tests and kept trying to rule out other possibilities. I found a problem when I made profiles, same problem over and over, and I tried to analyze it the best I could. As it seems, there is a flaw in profiling with some information lacking in one area and some added in another.
Some people seem to think that I'm doing this to complain or something. I'm doing it in the hopes that Kemper might be able to do something about it in a future update. If the Kemper makes an eq decision for you and you're happy with that: great! No need to update if you think the product is already perfect. Maybe the fact that Kemper keep putting out updates baffles you.
tgs - sent you a file.
Got it! I just tested it and compared with the OR 15Cranked program that you sent. Since it's not exactly the same setup/mic position, etc, it's not very accurate to compare them. I zeroed the tone stack since it was too middy in comparison. I captured a curve of your clip and one with me playing roughly the same riff.
[Blocked Image: https://dl.dropboxusercontent.com/u/8687414/Kempertest/bshaw-comp.JPG]
It has a similar thing going on between 90 and ~200 and added information below 90, but since the rest of the curve is quite different as well I can't draw any conclusions from this. The top end smoothing is probably the Character that was set to -4. Unfortunately I don't have more time to experiment with it at the moment. 
Alright, been a bit busy the last few days but I did get around to testing a couple of things.
bshaw92: I tried the profiles you sent, and while they do have a very similar frequency response in the low end, it's not much that can be said about it unless there is a clip of the original amp to compare it to.
Deny: I tried these settings but the filter setting is way too high up. Also it'd need more resonance to get closer to the suggested curve. However, adding more resonance, even with the volume parameter set to -5, makes the Kemper fart pretty bad so I wouldn't want to use that. 
It would be great if someone could confirm that these settings compensate for the bass response deviation in the KPA.
I'll try with these settings tomorrow and post my results. It could be a handy quick fix until the issue is hopefully fixed. Too bad there are not more slots available in post. Would be great (albeit confusing for some users) if all fx slots could be selected as pre or post. Maybe as a hidden feature or something.
bshaw92, you could use Audacity for plotting the spectrum. Audacity is free software (GPL) and available for Windows, Mac OS X, and Linux.
Usage:
- Open your audio file, select menu "Analyze" - "Plot Spectrum..."
- adjust parameters to taste
- save spectrum data with "Export..."
Does it have the possibility to show multiple plots at the same time though? That's the thing I like about Ozone, it makes it very easy to compare plots.
Unfortunately there's only one "X" slot after the amp block, so if I put a low pass filter there I won't be able to add the +2.5 dB @ 110 Hz. I do own a pink noise generator and could take some measurements but it would take lots of time, which I'm a bit short on right now. I'll keep trying to match the low end on my own profiles by ear and see what I can come up with.
Unfortunately there's only one "X" slot after the amp block, so if I put a low pass filter there I won't be able to add the +2.5 dB @ 110 Hz. I do own a pink noise generator and could take some measurements but it would take lots of time, which I'm a bit short on right now. I'll keep trying to match the low end on my own profiles by ear and see what I can come up with.
You can put an EQ in the Mod slot as well.
Maybe you could try this in demo mode:
http://www.bluecataudio.com/Products/Product_FreqAnalystPro/
"Demo Limitations
One single instance of the plug-in per session.
The plug-in is frozen for 4 seconds every 40 seconds."
So it might work.
EDIT: Seems like the Ozone demo should work as well: "In Trial mode, Ozone 5 and Ozone 5 Advanced (including Insight) will
work without restriction for 10 days. After 10 days, the product will
operate in Demo Mode, and will insert silence at regular intervals"
I've tried finding an analyzer online and the three I've installed don't provide an option to save a snapshot for comparison. Does anyone have experience with a specific "free" program that will accomplish this task so I don't have to keep searching? I've been able to use the software and an app on my phone, but for accurate numeric comparisons sake I need the snapshot. I compared via recording using ABY switch. To get closer profile results I had to change the amp settings a bit (clarity, bias..etc). Setting my Orange aI mp eq. neutral (12:00) I adjusted the bass to 1.4 and mid to about the same on the profile. I refined about 5 minutes doing multiple activities. With my profiles I find a little of the tube amp "growl" missing as well so I starting playing with everything to see what it would changed. I went to the cabinet adjustments and found changing the "character" added some of that "growl" back in as well as some amp settings mentioned earlier. So I have added bass, mid and set the character on the cabinet to -4.5. That along with the amp settings sounded as if it got much much closer. To have a scientific result I would need to run through an analyzer that could compare the two output results as you have done. The gain on my Orange was at 3:00 with the volume at about 8:00-9:00. I cannot give more information until I can check against each other....
Are you playing while comparing or are you using a pre-recorded DI signal? It's more accurate with the latter since you're comparing the very same thing. Anyway, if you can make wav files of the two, I can run them through Ozone for you and capture the curves.
Regarding the ABY pedal, that's one way to do it. Another easy way (which is what I tried apart from a couple of tests just to rule out that this method was degrading the audio somehow) is to stay in Profiling mode and switch between "Kemper Profiler" and "Reference Amp". This is how I ran most of the tests.
The remaining parameters remained unused. I've set the bass frequency a little higher than you did because the bass shelf filter slope in the KPA seems softer than the one you used (24dB/oct IIRC, maybe the Kemper studio eq has 12dB/oct).
No I used a high-pass filter. The low band EQ on the Kemper is shelving.
The result was that those bass heavy profiles sounded *much* better. Can you confirm if doing this on the Kemper side will bring those curves closer together?
Try to find a way to measure it and compare. Could be a quick work-around for the moment, until the issue is (hopefully) addressed.
If you could post a couple of the Dual Terror profiles at different gain stages it would be greatly appreciated. I would check against some other Orange amps I have......or email me via pm.
I can do that when I have a moment. BUT, the frequency discrepancy is exactly the same with my JCM800, Mesa Trem-o-Verb and 5150, with two different cabs and different mics. I've also tried two different guitars, external preamp vs Kemper's onboard preamp, etc etc. So the issue is not specific for the Orange.
We will investigate this.
We have done intensive tests prior to the release of the profiler and we haven't changed the profiling algorithm since then.
We are aware that some profiles need refining in the bass areas, but so far we have not identified a bias in the direction you experience.Please send one of the profiles in question to our support. It will be interesting to see if your profiles show aspects that are not captured by the profiling process, and are reluctant to refinement.
Checking this will take some time, as I will go for summer holidays this weekend (two weeks).
Thanks
CK
Thank you CK! I'll make a couple of profiles soon and send them to you. If there's anything more I can do to help in the process, don't hesitate to ask.
Are you recording both clips (reference AMP and profile) through the Kemper?
Yes. And as explained earlier, I also tried recording a parallel signal from the mic preamp directly and the result was the same. I've also tried both with an external preamp and with the mic straight into the Kemper. Same result.
TGS: I guess the question that comes to mind is...besides looking at what the graphs and trace lines are saying to us..How does it sound? I mean...Is the the tone rocking? Does it put a smile on your face? In spite of not being 100% perfectly profiled?
At some point we have to stop looking at charts and just play it...
How does it sound, well it lacks in the low-range, around 100-120Hz specifically. I can clearly hear it and I don't like it. If you listen to my first clips you should hear it too.
The point with my further investigation is to find what is the problem and to find a remedy. Hopefully one that can be implemented already in the Kemper, when profiling. I sincerely hope that my posts are of use and interest to some. If you're happy with what the Kemper does for you, then great! I'm also VERY happy with my Kemper, BUT I'm experiencing a problem, and with my tests I'm coming closer to a conclusion that the problem persists regardless of signal chain. I'm hoping that someone can either confirm this or get a different result. It's not that it sounds like crap. I'm just hoping for an improvement.
