Thanks to you both for commenting on AnalogEQ vs software, this has led to an afternoon of playing around with both my Mac and iPhone as sources to the BF2, and trying to A/B the Mac with and without SoundSource EQ app running. In every case, I'm using Tidal in exclusive mode (and really enjoying Primal Scream's Vanishing Point)
End of the day, I can't hear any difference with or without SoundSource in the chain on the Mac, except of course if SoundSource has any EQ's enabled, in which case I get whatever 'colour' I'm after. I didn't actually purchase SoundSource for EQ, rather I find it really useful as a switch for multiple audio inputs into whatever outputs I like. I'm working at home a lot these days, and likely for as long as I can foresee, so being able to have find control of source audio from Tidal, Apple Music, bandcamp, browsers, or whatever along with Zoom, Teams, Meet etc is very very handy. Anything I want to hear in my IEMs/HP, I just set the output to Bifrost2 Unison USB and all is Good in the World.
Maybe I need to get a hardware analog EQ like a lokius at some stage to really test it out, but for now I'm not sure I need to spend those $$ there...
Funny enough, I actually read the opposite when it comes to analog EQ and software EQ - that software is actually better since you can be much more precise in your frequency tweaks than analog.