Audio Science Review = "The better the measurement, the better the sound" philosophy

I have couple questions to “ASR Tests Originator”:

1: Can you please describe your measurement equipment' employed at ASR LAB? I assume tester is calibrated, maintained, and upgraded periodically, - correct?

- are you doing your measurements in Faraday Cage?

-what cabling, loading, power, additional filters, shielding, etc are used for ASR tests? ..and why do you think your test setup is good to represent average user?

2: How do you select units for tests? Do you receive devices from manufacturers, or do you obtain those randomly?

- sometimes manufacturers prefer to send “good units” to third party test LAB to produce “excellent reviews”, while most of manufactured units of the same model are "so-so". I haven’t seen two analog sound units, including speakers, amplifiers, pre/eq/etc of the same model/brand with the same test results in my life!

regards

@amir_asr "I have reviewed 1,300 products” in not authorized/certified LAB? WOW

what is your background, engineering degree etc?

@amir_asr "Measurements I perform are routinely replicated by manufacturers and other third-parties” - please provide proof to your statement.

Amir, your equipment and tests are “too ancient” and missing novel micro-dynamics, transient, noise and more important performance metrics High volume manufacturing data is missing in your tests as well. 

I would recommend you to put disclaimer on your test results “test results are based on my personal skills and knowledge” to avoid legal issues. 

disclosure: I am experienced analog circuit design engineer, currently working at major US corporation 

@amir_asr "

No Faraday cage. Those are used for EMC testing.  None of you  use your stereo gear inside such a cage so I don't see why I should test them that way.

Cabling for XLR is Mogami Gold. For RCA, I use Amazon Basics. No power conditioning is used or needed. I have tested a ton of these and either do nothing, or impair performance. I do have a LAB AC generator that I use for special testing.  Ditto for DC lab generator."

Thanks Amir for response! I can ignore your test results now! 

@tonywinga +1 "This comment by Amir regarding speaker upgrades:  As to his upgrades making sense, they do most of the time from technical point of view.  But not remotely on cost basis.  He also detests EQ which can do the same thing for free.”  -there is a pulse speaker response test available to prove Amir is wrong 

+1 "He is in over his head”- yep

@amir_asr do I get it right what you say: -130dB using Amazon RCA basic cables in not shielded chamber? Without power filters or RFI noise control etc? 

@fleschler +1 on putting ASR reviews “under review”! :-) 

@crymeanaudioriver "you have made many derogatory comments” which one? 

@amir_asr "Is your profile public somewhere?” I am your ASR-reader-(ex)customer, not adversary, thus sorry I don’t think you need to know details about my professional life. The question in this thread was about your professional reviewer credibility, not mine, Amir. 

@crymeanaudioriver ..barking on wrong tree? 

amir_asr

54 posts

10-05-2022 at 06:08pm 

@woodsage 

So have stopped going to doctors now? 

@tonywinga +1

@russ69 +1

I think measuring amp by driving pure resistive load is not enough. It is much harder for amp to drive actual, far from ideal, non-linear, distorting. etc speaker, vs resistive linear load. Many PASS amps on my opinion are good choice for driving high end speakers. 

@fleschler +1 "Now I think I will begin another forum concerning manufacturers supplying measurements and testing"

that would be great, please do!