On 4/23/2023 9:43 AM, jim.thom jim.thom@telus.net wrote:
ALL of my XLR cables I fabricated myself, were 1 pair, twisted, and teflon
insulated..and a woven braid, then the outer pvc sheath...(surplus telco
cable we tossed at work).
Jim,
AES Standards, like all REAL Standards, are produced by engineers
working in a very broad cross-section of the industries who will use
those Standards. Your application is but a pimple on the elephant. The
company whose advice you quote, while the designer of truly
excellent-sounding dynamics processing (for its time) for broadcasting
and broadcast production, also sells products with SCREAMING Pin One
Problems, one of which was among several I tested in the VHF-UHF-rich
environment of downtown Chicago. With properly wired test cables, its RF
susceptibility made it un-useable. This 2003 AES Paper documents that
work. http://k9yc.com/AESPaperNYPin1-ASGWeb.pdf
This AES Paper documents corresponding work on condenser mics from
Neumann, AKG, Sennheiser, and Shure. Although not identified by name,
the worst offender was Neumnann, the best was Sennheiser. When I showed
this to the AES Standards Working Group on mics, which included members
from those companies and others, I did identify them. The amusing part
was that Sennheiser had by then acquired Neumann, but their engineering
groups were independent operations.
http://k9yc.com/AESPaperNYPin1-ASGWeb.pdf
The digital revolution has drastically changed audio signal distribution
for large scale production in the years since AES analog Standards were
written, but the stated practice was absolutely essential when, for
example, in medium to large scale music performances two 32-64-input mix
desks, usually at widely separated locations, are producing separate
mixes from the same mics -- one for the audience, another for performers
on stage. And there are direct feeds from amplified instruments like
keyboards, guitar, and bass, that feed their own amps running on stage
power. If the production is being broadcast or recorded, a third mix in
a truck is producing that mix. In addition to their physical separation,
the truck will have it's own power feed. Those separate mix desks within
the facility, or with a touring company, were often NOT from transformer
isolated splits. AES Standards are written so that those applications
are viable.
73, Jim K9YC
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