I find it amusing that some will make disparaging comments while holding the FEQ/HFT to a different standard. First of all, the video was intended to show placement options, not to evaluate the product via low-rez audio in a YouTube video.
More importantly, acoustic treatment companies provide minimal specs for their products. Although ASC doesn't publish any specs for its Tube Traps, it's widely considered to be effective at reducing bass mode and improving diffusion. I still use several Tube Traps because they improve the sound. Some acoustic companies like RPG publish absorption coefficient data, but nothing about in-room response (probably because there are no "typical" rooms). How we assess these products without hearing them at home?
Since there are JL Audio owners on this thread, why doesn't it provide specs on the ARO (Automatic Room Optimization) system? I think that it's effective (because I've owned a pair of Fathom 110s), but JL Audio doesn't provide any measurements on the ARO system.
How about McIntosh? The 275 has similar published specs to the NAD M2 amp, but does it sound different or better? My friend has tried different KT88s on the 275 (with audible improvements), but I don't think he relies on published specs to choose his tubes. I can't find or rely on published specs when I search for 6SN7 tubes. Does that make tube rolling voodoo or DOODOO?
I don't want to pick on McIntosh because many hi-end brands don't publish detailed specs. Is there any measurable difference between the Pass .5 to .8 series? How about from Pass XA to the XS series? I'm sure that the XS preamp and XP-30 will sound better than my XP-20, but I can't make that determination from the published specs. Should I call the Pass XS amp snake oil or voodoo before I hear it?
How about vinyl? Are there any measurements to show the difference between a peripheral ring over a vacuum platter? I love my Tri-Planar Mk VII arm, but I don't think it measures better than my old VPI 10.5. Since most CD players measure better than vinyl, is the latter voodoo? I don't think so.
It should be noted that Synergistic is the only company on this list that offers a 30-day money back guarantee. I also haven't heard a negative comment from someone who's actually heard the FEQ/HFT in a proper setup. It may not work for everyone or setups, but how many products do? Measurements are useful but so are our ears.
They did a sonic demonstration. They kept stating "how you can hear the improvements". You don't need specs for that. Their demo was a failure. This was another case of The Emperor's New Clothes.