Should Speaker Manufactures provide a Frequency Response Graph?

No.  But they should include a warning label stating that their sound can be highly addictive, thus straining relationships, creating an additional financial burden, and many hours of sitting in the "sweet spot" can be detrimental to your health.

I agree that one measurement (out of a possible 7?) does tell the whole story.  Horsepower and torque specs when selecting a automobile can be "useful".  But, we did reject a vehicle because we didn't like the cupholders.

If you go to the drag strip and test run your car and you post your 0-60 and 0-100 run, I wonder if you will get in trouble with the manufacturers.  And thus, the conversation.

@deep_333 +1

The most important graph for me is the Impedance & Phase vs frequency graph. I want to know if my amp needs to drive 2 ohm loads with a difficult phase angle. I believe it to be the most important data when choosing a power amp. next up is sensitivity. That too dictates my amp selection. Then I can vet by sound quality to my ears.

I do ears and brain, not graphs and numbers. I don't know the measurements of the gear I've got here and I don't much care, I just know it sounds awesome.... But if people want them, they should probably be available, with the usual caveats.... 

Iaoman,

“In what way? Do these measurements tell me I will like what I hear?”

Yes, they do tell you what you hear and estimate in room too. Each room is a bit different though so there is some variance which is mostly 200hz (not to mention some of us have HF hearing loss) and below. once you hear a few speakers that have full measurements and decide which ones you like better it is pretty easy to look at other measurements and know which ones you will like better and seek a demo based on those measurements. You can even look at the dispersion and understand what the soundstage is going to do.

I don’t read or post on ASR either, as I don’t like the absolutist attitude and whiny commentary on their but there are a bunch of knowledgeable people there just as there are here (many of the same people…)

Lack of measurement understanding does not make measurements untrue. Some things are very subtle in the measurements and it takes time to understand them.

Some things are still lacking in the measurements, I feel transients and detail is still missing but measure and use the data you have and demo for the other things.

I have owned two speakers that have both had full spins. The Revel 228be and the JBL 4367s. I did same room/system direct A/B comparisons. Listening to them back to back and looking at the measurements is almost 1:1 how they actually sounded in my room.

I bought the revel after demoing and bought the JBL 100% blind based on the measurement…. I kept the JBLs and sold the Revels after direct A/B in my room.

As engineer for 20+ years I can assure you 99% of the high tech things you use (or even keep you alive, I work in the biopharmaceutical industy) were build or designed using models.