Very relevant post I think given the emerging trend towards modeling equipment. Current FRFR equipment offered in the marker tends to roll off at 70 Hz. Indeed as stated below FRFR sound reproduction from the listeners perspective is the combination of what the power amplification&speaker produces AND how these are affected by the room/venue (resonant modes etc). As a guitarist who uses modeling, and since recent started to play 5S-bass, and as an engineer audiophile who likes building speakers, disatisfied by current FRFR products available, I am currently building compact active (1200W) FRFR monitors containing a coaxial FR driver and 2x10” subwoofers crossed over at 100Hz, which can truly provide FRFR from 30Hz - 20kHz and where DSP presets offer different profiles to either optimize for ‘flatness’ and different room modes upto min 110dB SPL or if needed for life use gain additional SPL flat from 40Hz upward. As stated below FRFR’s benefit is mostly that offers a consistent platform to amplify front end setups of effects, amps, and cabinet types produced by the modeler. For large venues typically you will augment with PA sound system and sound engineers love to just get the DI signal to throw in their mix to FOH. Let me know if you are interested to learn more about the design of my ‘extended bass’ FRFR monitor, which solution currently is simply not on offer in the market.