If your going to spend money on the kemper , you have to spend equally as good money on a cab IMHO, why buy a high end guitar and run shitty cables? I would of thought that with 1500 watts of FRFR power that you would get close at least. sorry to hear that.
The only time i ever shut up the 4X12 amp in the room guys was when i got one of my kempers and ran it into my mission Gemini 2, this time tho i plugged in my second 2X12 mission Gemini cab so the master/ slave configuration was active.
So my 2X12 mission stereo cab became a 4x12 STEREO cab.
I nearly blew my balls off. I had the Mesa rigs, krank and when i loaded one of the STL profiles i seriously thought shit man its just too massive.
We were drinking beer and a friend made one of those "funny" comments that stuck in my mind.
He said, if you want that amount of air to be moved and a big sound like a 4X12 THEN YOU HAVE TO RUN A DAM 4X12.
So obvious but was funny, because the whole time i had been chasing the same thing, (amp in the room etc).
I did try and mess with the cab parameters to make it more flat and amp in the room (gemini 2 has this ability)
Tone junkie did a good video on this BTW.
But a stereo 4X12 coming out of the kemper can hold its own.
Just saying.Try it you will see.
Ash