I don't know why RichDavis go on and on about RAL and Acoustic Fields measurements.
The reality is that Acoustic Fields and other acoustic treatment companies (eg. RPG, ASC) only provide absorption coefficient measurement (usually in the 100-1000 Hz range). This info helps the buyer to choose between different bass panels but doesn't tell a buyer how many panels/traps to buy, or where to place them. I've had good experiences with ASC, GIK, and Rives, but they can only provide guidelines about placement and the extent of acoustic treatments. They usually suggest to start with a basic package and then add more as needed (usually based on listening tests).
It should also be noted that Acoustic Fields doesn't provide any measurements for their diffusor panels. I suspect the reason is the lack of a widely accepted standard.
Lastly, Acoustic Fields or other companies don't provide in-room measurements before-and-after using their acoustic treatments. This info is only available from an on-site visit and can be expensive because each sound room is different.
RichDivis's nightmare is probably that the Acoustic Fields or HFT customer has to do the final evaluation using a wide range of music. The horror! I think the average audiophile can learn to hear room and component differences. For example, is the bass more extended and articulate? Is it easy to follow the bass line or hear the hall ambiance? For the mid-range and treble balanced? Is the timbre accurate natural? Are there any hot spots? Does the soundstage match the music?
Professional musicians and critics go through the same process to fine-tune a new concert hall or venue. Some halls have even added adjustable acoustic features (eg. diffusors) that can be re-positioned for different music or audience size. If measurements were infallible, we would not have so many bad-sounding halls or expensive acoustic makeovers.
As a happy ASC and FEQ/HFT customer, I can attest that familiar recordings have never sounded better. For example, Brubeck's Take 5 (45 rpm), Norah Jones Come Away with Me (DSD), Cowboy Junkies Trinity Sessions (45 rpm) sound detailed, natural, and dynamic. You'll probably have to spend much more (with less WAF) to get better results than the HFT.
Let your ears be the final judge. This is not a new idea, and is certainly more enjoyable than responding to trolls