Nearly all manufacturers do not advertise/exhibit their product measurements? Why?

If you spend a lot of money on audio equipment, it is helpful to have a basic understanding of specifications and how those might affect successful partnering of equipment.  Examples include how the relationship between amplifier power and speaker sensitivity affects dynamic performance, as well as how input/output impedances, speaker phase angles, and impedance fluctuations with frequency, can affect the successful partnering between equipment.

I do not agree with the statement that specifications are "pretty much useless unless independently measured".  I cannot remember any cases I have seen with wholesale deviations between published specifications and published measurements by a third party, such as Stereophile.  I would not purchase expensive audio gear without reviewing the specifications as due diligence to verify the gear is likely to serve the intended purpose. 

Speaker manufacturers use measurements as a necessary tool in their development, but they're not necessarily to any good use to the buyer as it pertains to being a worthwhile reflection of their sound in certain respects. In some cases though they can be of use, like the measurements supplied to the pro compression drivers of my speakers where we used them as an outset (before taking measurements ourselves) for making filter notches and a peak suppression in an active configuration. The supplied measurements by the manufacturer turned out to be rather spot-on, we just used our own measurements to hone in more precisely on the specific notch and suppression frequencies in the tweaking process, while also to be the wiser on the actual, overall frequency response. 

What I would like to see supplied with speakers, and which I believe to be relatively indicative of a speaker's performance in selective areas, is distortion numbers at frequency intervals over their entire spectrum and at low to high SPL's. Distortion numbers in the bass for example can amount to double digits at higher SPL's, but the more headroom the lower the distortion and the cleaner the bass. The same essentially goes for the remainder of the frequency spectrum. At least in that regard - i.e.: distortion numbers - I see speaker manufacturers hiding the ugly facts from exposition here, rather than honestly feeling them "irrelevant" to the consumers. 

@phusis Great discussion of speaker performance.  My Legacy speakers marketing targeted very low bass distortion.  Distortion numbers at frequency intervals at low and high SPL as well as bass=very indicative of a speaker's capability.  Speakers which have less good (even defective) measurements can still work well under certain circumstances (room, matching system, types of music).  I don't know their measurements but I find that I really enjoy listening to Maggies on voice and small combos but not for orchestral music, big band or heavy rock as a possible example (I've heard LRS to Tympanis to 20.1s over 35 years). 

As to measurements and reviews, all I get for cable and tweaks are subjective reviews.  Are there no good measurements/tests for them (I would suspect at least acoustic tests to view their effect on, frequency, dynamics, distortion and other acoustically testable phenomena)?  .  

"...all I get for cable and tweaks are subjective reviews.  Are there no good measurements/tests for them..."

Cables put different loads on the amplifier as does the loudspeaker. So a proper test for a cable's sonic signature would be to use an amp that is susceptible to those changes and a loudspeaker that has wildly different loading across the frequency spectrum. You would not be measuring the cable individually but the entire system's output. You would have to have a baseline system to do this...which would be our own system in most cases.  

@fleschler , re: specs for cables Mogami lists fairly extensive specs with each cable it sells:

https://mogamicable.com/category/products/W2319.php

Mogami Gold:

SPECIFICATIONS

Configuration
Part No.		W2319
Conductor	Details	12/0.18TA
	Size(mm²)	0.305mm² (#23AWG)
Insulation	Ov. Dia.(mm)	1.6Ø (0.063")
	Material	PE
	Color	Clear
Sub-Shield	Ov. Dia.(mm)	1.8Ø (0.071")
	Material	Conductive PVC (Carbon PVC)
	Color	Black
Main-Shield	Served-Shield	Approx. 38/0.16TA
Jacket	Ov. Dia.(mm)	5.0Ø (0.197")
	Material	PVC
	Color	Black
Roll Sizes		100m (328Ft)
Weight per 100m (328Ft) roll		3.5Kg

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