Thank you, you are correct, I meant cut! I would have to politely disagree with 'this is just the nature of the beast'. If they are simulating cab + mic setup the frequency should be set to mimic the actual cab without having to look up the cab's frequency response. The reason I went from Class D + Cabinet to FRFR was to use different cabs. However, I can go from that setup (granted I only have 5 cabs as my sample size) to the FRFR and the sound needs a lot of adjustment to even come close, setting HPF/LPF, eq adjustments. I can go Helix + Class D + Cab + Mic -> PA XLR and my ears have yet to bleed.
I'll admit my expectations maybe off. I have been playing for over a decade exclusively on various Line 6 Pod + Various Amps + Various Cabs but assumed I could replicate what can be heard with headphones with an FRFR and reduce gig baggage. Maybe I can with some more tweaking. Unfortunately, I like playing more than tweaking so my ultimate answer maybe to limit my options and go back to Class D + Cab.
I started with the LINK and it was harsh. I then read it needs a special cable and the AES setting. So, I got one and set the setting. Little difference. So, I went to XLR. While the output was not nearly as loud as it was when using LINK it was much less harsh but still ear piercing. I have also tried the L3T on the floor and standing up, towels draped over the tweeter. Tried the various settings (except I have not tried the cab sim on it).
It sounds OK now, but not what I was expecting. Though, I am going to try the Helix direct into my PA next to rule out a crappy L3T.