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I think the Kemper AMP EQ is really good for most things. But maybe it is not the best for metal stuff. The Kemper also feels like you lose some dynamic range when you start turning down the high freqs (could be listening volume and our ears tricking us).
CABINET SECTION
As Bayou was pointing out, you can adjust some shrill in the CABINET section. By changing the HI SHIFT setting, you can adjust where that shrill freq is at. Usually around -.5 works pretty good. But sometimes actually turning it up a little moves the shrill to a better spot. Dont forget to press SHIFT in Rig Manager to make adjustments since the HI SHIFT is very touchy.
Tweaking the CHARACTER can sometimes help also. This flattens or amplifies the frequency variations in the IR/Cabinet. Turning up the character can sometimes kill some high freq if the cabinet used has some cut there.
PURE CABINET as mentioned tries to clean up the highs also.
A STUDIO EQ in the X slot (right after the amp) is a really good thing. As mentioned above the HIGH CUT can be added there. I have also played the game of setting a gain up 6-10 dB and trying to find the shrill freq. Then reducing the Q (width) of the filter and cutting that freq.
A good SEQ start point for metal is:
Low: +3dB @ 200 Hz
PEQ1: -2 dB @ 550 Hz Q: .525 (.707 is default)
PEQ2: 0 dB @ 1200 Hz Q: .525 (.707 is default)
Hi: +3 dB @ 1900 Hz
Hi Cut: 4.5k - 8k
Some metal stuff likes the 1900 boosted. Some likes it cut and the 1200 boosted. You may need to adjust the 1200 freq and the 1900 freq up depending on the profile. Like 1400 may give a better presence and 2500-3500 may be a better cut starting point. Depends a lot on the profile.
For most situations I like a TREBLE BOOSTER in the X slot (SEQ after it). Not so much for metal, but it sounds like it may help. Tone around 1.0 - 3.0 and set MIX to about 10%. This smooths out the harsh highs a little and gives a wider hi freq boost over all. This may let you turn down the AMP section treble and presence without totally killing the high end. For many profiles the presence may be down to -3 dB for example. It also feels to me like it adds some dynamics back after you kill the treble and presence. Psycho acoustic probably since it will be louder.
The SEQ and the TREBLE BOOSTER will also let you turn the AMPLIFIER MID up some. Since the MID is sort of high in freq, it is really the thing to adjust to get some more presence and let the SEQ and TB provide the cleaner high frequencies.
Another thing that can really help is the AMPLIFIER CLARITY setting. This seems to be an expander. So it will remove some of the distortion hair. If it is too fizzy/shrill the clarity will clean it up. You may actually need to add more gain after if you turn it up a lot.
Having a HI CUT to about 2k - 3k in the first slot will help some too. Also helps reduce noise. Then you can also punch up the mids a little to get more meat. But the EQ sometimes kills the tone and phase relationships a little. Your mileage may vary.
Hope some of this gets you on the path. I know I always make my stuff way too bright. Then I listen to something on YouTube and the high end is dialed way down compared to me. I think it is because when you are playing the guitar by itself, more lows and highs sound better. But in a mix it sounds thin and fights with everything.
Hi and thanks for the detailed suggestions! I did try a bit of this and that before reading this. I will try more, its already far better then where I stared. It does Sound like this is an issue for more then just me (glad to hear) and metal may be tougher (oddly) to get it sounding right w/ tight low end. I’m glad to hear some of these ideas and that there are some decent solutions. A lot of variables! I had an opportunity to get my hands on an UA Ox box and plugged my orange amp into it, selected a 4 x12 cab. Ribbon mic (modeled) some room and another mic (off access) and it sounded pretty legit. Having the front end be an actual live amp with tubes obv. Helps a lot but in this scenario you have only the amp sounds you own. All good, thanks everyone!
Cheers Neil