You could use the Spark and add a high-cut at 12 kHz. 
Posts by Gitarrenschlumpf
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We do such things at BlueAmps .
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Even if you find this Camplifier and build it into your cab, you will not have an FRFR cab after that. Building a FRFR cabinet is more than putting flat speaker into a 2x12" housing. It will be loud and will sound okay but it will not be FRFR.
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So you´re looking for the Camplifier 360.
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The Kone is flat until 10,5 kHz and not FRFR. Everything above is a DSP boost by the Kemper.
Take a look at a good FRFR cab and you will not have this issue.
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We played The Look some years ago. The main riff is a 12-string guitar. An octave of the pitchshifter helps a lot for this.
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active 2x12 coax FRFR
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You have to take a look at the Thiele Small parameters for calculating the housing and the port. The problem: There are no TSPs for the Kone available. You have to measure it. Then you calculate the housing and port, build it and measure all.
We did all this and it took some weeks. --> https://www.en.blueamps.de/conehead-212/
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We measured both. Both are great but different and need speacial housings.
F12-200X: FRFR, up to 16 kHz flat
Kone: GFR, frequency starts to feel off from 10,5 kHz on. And it makes no sense to boost all frequencies above to get it to FRFR because it decreases the headroom.
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What???
I've had my Kabinet for a few days now, and it is the BEST choice for what you want, IMO. You can project your tone exactly to what you hear coming out of studio monitors at home, or use one of the speaker imprints to add some great color options. The Kabinet also has killer bottom end and really brings life into your rigs either way you use it. I was considering some HR 112's before, but that would have been a big mistake for me. The Kabinet is the icing on the cake for the profiler. You're wasting money on any other choice.
Measure it and take a look at all frequencies above 12 kHz. Or play acoustic guitar through your studio monitors and compare it to the sound of the Kemper Kone. It sounds different. But yes, the Kone is a great speaker and the IMPRINTS sound very good.
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So you have to go the FRFR way. Kemper Kone and Kemper Kabinet sound great but are not the best choice for FRFR.
I´m from http://www.blueamps.de and don´t want to talk against other manufacurers FRFRs. Sorry.
Building a good FRFR speaker system are more than taking an empty cab and putting a speaker into it.
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If you want the same sound as you can hear at the FoH, you should go the FRFR way -> X-200.
If you want a sound of a (virtual) guitar speaker with a little more "feeling" and another sound at the FoH, you should go the GFR and imprints way -> Kone.
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Nein, dann geht´s leider nicht.
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Kannst du dafür eine Rechnung mit ausgewiesener MWSt schreiben?
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The high end is totally different from the Kone !
That´s why I wrote "similar". The Kone is based on the 200TC and Kemper modified it.
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F12 is not the Kone there another Modell from Celestion which is similar
but not he same
Imprints only work as they should on the Kemper Kone
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The Celestion K12H-200TC is similar.
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Okay. We´ll measure it after the cab is out. Thanks!
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With some additional tweaks specifically to work with the Kemper DSP. It is not just a K12H-200TC running at 4ohms.
Additional tweaks of a speaker to work with a DSP? Tell me more, please.
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Yes, a 4 ohm version of the 8 ohm version.
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This is actually the first application that made me wish I had gone for the PS170 over the PB100. I wish these speakers were 8 ohm and not 4.
The K12H-200TC is 8 ohm. Same speakers are in our Camper series (GFR) for years.