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


After my Audio Science Review review forum, it became apparent that nearly the only way one can determine the measurements of an audio product is wait for a review on line or in a publication.  Most equipment is never reviewed or is given a subjective analysis rather than a measurement oriented review.  One would think that manufacturers used tests and measurements to design and construct their products. 

Manufacturers routinely give the performance characteristics of their products as Specifications.  Those are not test measurements.

I searched the Revel speaker site for measurements of any of their speakers and could not find any.  Revels are universally lauded for their exceptional reviewed measurements.  Lack of published manufacturer measurements is true for nearly every speaker manufacturer I've searched for on line, perhaps several hundred.   Same is true for amps, pre-amps, DACs, transports, turntables, well you get the picture.  Do they have something to hide?   I doubt the good quality products have anything to hide but poor quality products do.  

ASR prides itself in providing "true" measurements that will aid in purchase decisions.   Why don't the manufacturers provide these measurements so that reviewers can test if they are truthful or not?

Then there are the cables and tweaks for which I suspect that there are inadequate tests available to measure sonically perceived differences but which objectivists believe don't exist or are "snake oil."  

Well, please chime in if you have some illuminating thoughts on the subject.   

I would have loved to see manufacturers measurements on my equipment and especially those that I rejected.  

fleschler

@mastering92 , how many people work under you?? What is the most number of people you have ever had work under you at a company?

Microsoft is huge. How many people at Microsoft have 1,000 people under them? You argument about them being a huge company matters little. Huge companies also don't allow people to grow into rolls where 1,000 people are under them if they are "failed". Sure, it happens, but in general, if you rise to have 1,000 people under you, then you had a lot of success and accomplishments along the way.  When you make statements like that, it has no relevance to the discussion and just comes across as sour grapes. To me, I won't even read the rest of what you wrote as making that statement shows you are unable to be objective in your views and analysis.  If you want people to respect what you write, then be respectful in your writing.

Go on and on? A list of what people without experience fear serves no purpose in your credibility with me. In my experience, people who specify "ceramic saftey capacitors" and "no saftey resistors" know how to spell "safety". Can you tell me the difference between a computer grade "vertical-chip capacitor" and an audio capacitor? I doubt my EEs know, perhaps they could learn something.

Perhaps you can share how if you measure a box, that happens to be a DAC, you are not measuring "the total sum of parts inside the electronics, but the DAC chip at the engineering standard itself".  How could the equipment doing the measuring of the box measure anything but the total sum of the parts?  Your statement is not logical.

I am not an EE, but I have a bunch working for me and I am quite aware of the processes and decision trees they use to achieve the results we have targeted and it is not to throw out a laundry list of fears. I would suggest not doing the same for speakers. That is an area I know very well.

It is good to be critical of any form of review, whether a listening test or even a measurement to ensure what was done is accurate and representative. However, your last post is not a reasoned critique addressing specific elements. It is an appeal. It does more to justify ASRs existence than it does to discredit it.

A critique would be calling into question the Klippel testing that was done of a large panel speaker.  While Klippel can still provide highly accurate measurements of a speaker such as this, the test procedure must be modified, not just in the number of measurement points (which was done), but also the measurement cloud locations (and distance). This relates, as Amir has noted, to the accuracy of the model, but that accuracy figure is based on assumptions of what is being measured, so both need to be adapted and accurate  to accurately assess the error band. As well, the calculated summaries such as predicted room response, reflections, etc. must be adapted when a source is large enough to behave as a line array in the room it will be installed in or they will be grossly inaccurate at the listening position.

@kenjit about speakers, perhaps he should give it a go first. 

@kenjit when will you make the spherical speaker you posted about? The one based on studies done in the seventies that was buried by people that make box speakers?

Post removed 

@mastering92 , I could not have proven my point better, if I had written your post myself. If you are going to attempt to discredit someone online, including me, I would recommended what you write being accurate, supportable, and relevant. Making false claims about someone's career, questioning someone's equipment when it is among the best available, and then following up with a series of statements related to technical information, that are either not logical or not defensible is not a successful path. I have issues with some of the work ASR has done and I can clearly, concisely, accurately, and defensibly state it. I also recognize that does not negate piece of their work.