Hey
@FarleyUK - you can email me and I can try to help. Let me put this info out to all here, to see if it helps others struggling with FRFRs to get them sounding good.
In general, all "FRFR" speakers are not the same. I have my system tied to 1) an expensive pair of ATC25s (studio mixer quality), 2) Atomic Neo CLRs, and a 3) JBL PR812x PA speakers - and while the DNA of a preset is present on each when I play it and switch around, they do NOT sound the same.
I dial everything in on Atomic NEO CLRs because they have a very well defined upper mids which is a key part of guitar sound that needs to "be right." They also cut everything below 70Hz. Those are also coaxial speakers.
But when I play LiveGold presets on stage, loud as f*** through my Mission 2X12 Gemini II for gigs, which is an FRFR as well, it has a tweeter (and crossover) in it, and unfiltered it has too many lows and too many highs that are not present when I play through the Atomic Neo CLRs.
So, as solution, what I do is put a PEQ block in each gig preset, placed right before the appropriate Output Block going to the FRFR (Gemini II in this case, Output2). In that PEQ block, I cut a bunch of lows and highs with a strong shelf/cut, and boost some mids and upper mids but not heavily, nothing above +1db for me. Doing that "tunes" my FRFR to my preset similar to how I hear them on my Atomic CLRs, but even better, that helps makes the Mission Gemini II sound more like an amp/stack in the room. Know many others do the same approach.
I'm going to paste an example of this PEQ block settings below for you (and any others) to try out, if you are struggling with FRFRs to sound like an amp on stage with your presets or LiveGold presets. Using this solution may help solve your issue.
If you think about it, this kind of EQ filtering is of what your FOH/sound person would do at a Board to get your amp/sound to fit in a total band mix and not have clashing frequencies with other instruments.
Don't look at the below screen shot as "Gospel" settings, but as a guide or starting point. You will need to tweak some to "tune them" to your own FRFRs to get to the sound you like -- but this is the overall concept.
Generally speaking, the "meat" of a guitar sound is between 200Hz and 500Hz. If you are putting out frequencies below 100Hz in your guitar signal, it's going to be muddy and conflict with bass in mix (granted, 7 string metal may be an exception). The guitar and note definition is in the 800 to 2.2KHz range.
Guitar speakers really don't put much out over 6.5kHz frequency wise. An FRFR (or Cab IR!) that is letting those high frequencies through instead of shelving them (if not cut in cab block, say) is going to sound harsh on upper end.
View attachment 84380
So when you look at the above, looking at the Frequency SLOPE, not the numbers, you will see a gentle (not heavy slope) low cut starts about 110 Hz, a gentle hi cut starts about 4.5kHz, and a gentle mid boost happens from about 150Hz to about 2.5kHz. Note I then I cut the LEVEL by -1db to compensate for the PEQ (boosted mids mainly) making the sound louder than the signal entering the Output block.
Note that I am using the Shelving 2 and Peaking 2 types for each PEQ band, NOT the default ones. These are smoother curves. On Frequency 4, I will alter the affected frequency range from 1.2kHz to 2.2KHz depending on how bright I want it and what pickups (single coil/humbuckers) am using. You could also do four variations of this using the ABCD channels and switch it up that way. I usually don't need to touch the Q value (defaults to 0.707) but can if need be.
I've also found that doing this PEQ block placement before the Output block
on a per preset basis in our band's set list (Aerosmith stuff) instead of globally gives me a little more control to adjust the sound by preset -- since I'm switching guitars, pickup types, and preset sounds, rather than than trying to "fit" one overall PEQ in the Global output to work across everything, but you can also try that too.
Hope this is helpful! I think
@yek's Wiki on the Axe- Fx III covers some of this material as well.