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MQA is Vaporware


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17 minutes ago, Fokus said:

 

And that is very good. But in the case of the audibility of airborne ultrasonic sound in the context of music I am afraid you are not going to find much.

 

 

I am sure there is some research out there. Don't say never. It might be in very obscure journals or very old journals, which are not on the internet yet. Since I don't really have access to a nice University library any more, it is sometimes hard for me to go back far enough in the literature like I like to do.

Current:  Daphile on an AMD A10-9500 with 16 GB RAM

DAC - TEAC UD-501 DAC 

Pre-amp - Rotel RC-1590

Amplification - Benchmark AHB2 amplifier

Speakers - Revel M126Be with 2 REL 7/ti subwoofers

Cables - Tara Labs RSC Reference and Blue Jean Cable Balanced Interconnects

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5 minutes ago, The Computer Audiophile said:

100% true. 
 

It’s embedded. The file isn’t hosted on a site or server I control. Just like embedding a YouTube video. Another site is publishing it. 

AL you have to do is delete the embedded image, Chris, and replace it with the link to the As We See it on the Stereophile site. That way Stereophile's copyright isn't infringed and the debate on the essay here isn't interfered with.

 

John Atkinson

Technical Editor, Stereophile

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24 minutes ago, The Computer Audiophile said:

100% true. 
 

It’s embedded. The file isn’t hosted on a site or server I control. Just like embedding a YouTube video. Another site is publishing it. 

 

I'm sure you understand that this is ambiguous at best, regardless of what Posner may have written. We'll leave it to our lawyers to determine. Meanwhile, regardless of legalities, your refusal to cooperate has been noted. 

 

Jim Austin, Editor

Stereophile

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3 minutes ago, gfkeenan4 said:

 

There is research on the internet. I'm no expert on this, but it came up a few times at work in the past, so below are a few things I remember coming up (but haven't read), well I read about the Equal Loudness Contour and remember reading an article saying that people who "Feel the presence of ghosts" are very sensitive to inaudible low frequencies (unfortunately I can't find that article). However, the main jist at work was - we don't know if/how what we can't hear effects what we can hear.

 

Like I said, I'm not an expert. Just someone who has been pointed to things to read in the past and sharing that here...

 

Equal sound curves to understand the way human ears work with that we know they can here; https://en.wikipedia.org/wiki/Equal-loudness_contour

 

 

Low Domain:

 

https://asa.scitation.org/doi/abs/10.1121/1.4800459

 

if you have an academic login you should be able to see this one: http://search.ebscohost.com/login.aspx?direct=true&db=edb&AN=141863066&site=eds-live

 

If you can't the summary is:

 

 

High Domain:

 

And this one: http://search.ebscohost.com/login.aspx?direct=true&db=edb&AN=142975061&site=eds-live

 

 

Very limited experiment on high frequency (40kHz): https://pub.dega-akustik.de/ICA2019/data/articles/001374.pdf

 

I don't have access to this one: https://www.ieice.org/ken/paper/20091127Qard/eng/ but looks interesting.

 

 

There are also a few studies on how much air attenuates high frequencies. I think (keeping this post on topic (MQA)) this is one of the reasons MQA is designed how it is according to the first MQA AES paper. 

 

Yes, back to more interesting things. 

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