All this comparison is in one environment, and either playing alone or along with my band(s) music, at a lower volume. Bringing the heads/cabs to rehearsals would be the right way to do it, but I have rigs I leave parked at both places and, well, I’m pretty lazy by the end of the workday. (If only EITHER of my bands would practice on a Saturday afternoon!!!).
The GK Neo IV cabs are BIG sounding cabs, and with both the Ashdown and GK Fusion 800, it a matter of dialing the bass and low mids back A LOT. It’s something I’m learning after all these years of playing, dial back the bass freqs and push a little more volume to get some clarity and volume on the middle and higher notes, esp on the thinner strings. These cabs are forcing me to dial the bass/low mids back further than I thought I would ever need to. With these cabs, those frequencies are still strong and warm, even with the bass at 9 o’clock and low mids at 11 o’clock (or in the case of the Ashdown, the bass knob at 10 o’clock, the 100hz slider just under 0, and 180hz really cut at -6 - -10).