When I first tried making profiles years ago when the Kemper first came out I made a few beginners errors that resulted in a few questions that may or may not help you :
How are you comparing how it sounds? I highly recommend recording a DI track to use to re-amp through both the profile and the amp (and record both re-amps then compare them) rather than simply playing both, which will never exactly match up. Of course the converse is also true, don't send a DI to the amp while you're playing back the re-amp signals because you won't hear them over the amp in your room.
Are you profiling in the same room as your monitoring system? If so are you sure to turn off your monitors during the profiling process? The Kemper outputs the signal to all outputs meaning your monitors will also be playing it back, throwing off the profile so it's important to turn these off.
How close is your mic to the speaker? How lively is your room? The Kemper basically only does mic on the grill "close mic'd" sounds because it doesn't capture the rooms reverb. Move it up close and use a convolution verb or one of the inbuilt verbs to try and give it that sends of distant mic'd sound if that's the case, or bring back the effects from a more lively room.
Did you try refining? These days the profiling algorithm is much improved, back when I first started profiling I had to refine for a good ten minutes to get a profile close. That shouldn't be the case anymore but there's always the exception to the rule.
Does your sound have both pre and power-amp distortion in it? If so then the Kemper won't be able to capture it well. It does either pre-amp or power-amp, but not both together. Personally I would opt to use the power-amp distortion profile and a distortion stomp to recreate your sound in the Kemper, unless it's a super-high gain setting in which case I'd simply eliminate the power amp distortion and go for pre because that will result in a tighter sound.
Do you have reverb enabled on your amp (or any other effect)? If so then turn that stuff off and add it back in afterwards in the Kemper via stomps. It'll smear the profile otherwise.
I unfortunately have to run my amps in the same room that I am monitoring in, so I am usually wearing headphones to tweak and then audition. I also A/B using the monitors after profiling is done. The monitors are always turned down during the profiling process because of the possibility of the microphone picking up the sound. I always close mic, for the kind of music and tones I'm trying to create, I don't want to have any room sound at all. I have tried refining, sometimes it makes the profiles closer, sometimes they become worse. I'm aware of the problems with profiling a cranked amp with both the pre and power tubes cooking, so I usually avoid that. Most of the amps I own don't have a reverb.
Honestly, I think all the problems I've been having have been on account of the preamp plugins I've been using. Didn't think it would be an issue, but now I know that it's probably the source of all my trouble.
I miced up my Mesa Boogie Mark V:25 today and just played around with micing.
Basically, the results aren't half bad, so the micing technique and other variables can be ruled out. It's got to be the plugins (which I used on this recording as well.
Some time ago I had the opportunity to visit Michael Britt and he took me to his place where he does his profiling.
Report is here: http://nermark.com/reports/MBr…les/MBritt%20profiles.htm
What I saw really surprised me. The speaker was placed in a very large room with just two screens shielding it from the room reflections. The microphones were a Shure SM57 and a FatHead (IIRC) going through a inexpensive Mackie mixer. And as I consider Mike's profiles being the best commercial profiles, this shows you do not need fancy expensive equipment to profile.
I think some of my profiles are very usable and some of them were captured at home with just a SM57 going straight into the KPA. And I've helped friends make good profiles in their homes (dens, kitchens, man caves, basements, garages, etc.) with very modest equipment so I know first hand that it's possible.
Cheers and happy profiling!
That is very interesting Mats, thanks. I will try to create a profile tomorrow morning and see what I can come up with if I don't use a preamp.
Well yeah, amp circuits are quite similar to begin with, though I wouldn't say the only real differences are how they're mic'd. Plus, even those nuances of character are very important. But I was more referring to hearing similar characteristics in profiles when compared to their source. I'm really not trying to go back down the rabbit hole but if it's a common theme, then we can't just chalk it up to user error.
I know exactly what you're talking about. Others have argued about it before. FWIW, I seem to notice it more on high gain profiles than low gain ones, and that's a common argument that you'll hear about high gain amps as well: that they all sound the same.