A few comments about the Atlas:
In the original article, Stereophile managed to get the SRA photos mixed up. Stereophile put someone other than Michael in charge of matching the photos to the captions, and they dropped the ball. I believe that Stereophile published a correction in a later issue.
Despite the impression which you may now have, there is no industry standard for SRA. None. There is more of a standard for VTA (originally decided as 15 degrees, which is the origin of Shure's "V-15" name, and later gradually revised upwards until it reached 20 degrees) than there is for SRA. The only documentation for the 92-degree SRA that I have been able to find in any language is the John Risch article, and that never became part of any industry standard.
I have written more about SRA on the "What's Best" forum, on a thread called "The Importance of VTA, SRA and Azimuth".
From page 13 and on:
http://www.whatsbestforum.com/showthread.php?536-The-importance-of-VTA-SRA-and-Azimuth-pics/page13
hth, jonathan carr
In the original article, Stereophile managed to get the SRA photos mixed up. Stereophile put someone other than Michael in charge of matching the photos to the captions, and they dropped the ball. I believe that Stereophile published a correction in a later issue.
Despite the impression which you may now have, there is no industry standard for SRA. None. There is more of a standard for VTA (originally decided as 15 degrees, which is the origin of Shure's "V-15" name, and later gradually revised upwards until it reached 20 degrees) than there is for SRA. The only documentation for the 92-degree SRA that I have been able to find in any language is the John Risch article, and that never became part of any industry standard.
I have written more about SRA on the "What's Best" forum, on a thread called "The Importance of VTA, SRA and Azimuth".
From page 13 and on:
http://www.whatsbestforum.com/showthread.php?536-The-importance-of-VTA-SRA-and-Azimuth-pics/page13
hth, jonathan carr