I checked with the various suppliers and here's what they said.
Impact Acoustics:
"both the SonicWave and Velocity cables provide shielding around the Y and C conductors as well as an overall shield around the cable.
45437 is two copper braids with 85% coverage, and Al-mylar Foil at 100%
29158 is one copper braid at 65% coverage, and Al-mylar Foil at 100%
Compared to the combo cable 45443. They do use similar type of cable and shielding. The combo cable uses a slightly smaller gauge of conductor than the individuals. At a 6 ft distance, that difference should not produce any problems."
Tartan:
"Both the digtial audio and stereo audio cables have braid over foil shields - so two shields. The braid is a high coverage braid (90%). The s-video has a spiral serve shield. Each of the two coaxes has an individual serve shield."
Monoprice: No answer.
I don't like the look of the Monoprice s-video cable, even their premium cable looks like it uses a cheap molded plastic connector. Without a specific response to the shield coverage I moved on.
Tartan's audio cables appear to be well shielded for the price, and their connectors IMO look nicer than Monoprice too. But their s-video only has a serve shield which I don't like. A picture of a serve shield can be found on slide 25 of Belden's shielding presentation found here >>
http://www.belden.com/pdfs/Cable101/Shielding.pdf
Impact Acoustics has a well mode product but was still hoping to find a cable with slightly higher braid coverage. BTW, mheath8663, after considering shipping costs, tekcable was the lowest cost supplier.
Finally I took a look behind my system to check on what cables I had already. I had some Tributaries and Acoustic Research. Tributaries seem over priced and are not readily available over the web, on the other hand AR is widely available. After checking on the various AR types I decided to look for their Pro-II series. The connectors are metal and the cables appear to have good shielding, the braids at 95% and all contain a 100% mylar-AL shield.
I found the cables at
accessories4lss.com. The s-video cables, now not so popular, were going for a song, so they were a no brainer. Then I started looking for the digital audio cable but it was not available in 6ft. As it turns out the composite video cables use the exact same construction and it was also going for a song. Another no brainer. Then I started to look for the stereo RCA cables. I like them because they are a shielded twisted pair design. They were also going for a healthy discount... but as it turns out the combo pack of L/R stereo plus composite video coax went for less then the stereo pair alone (80% discount). So I ended up purchasing that way. Two calls to AC4L confirmed the make up of the cables and that the combo pack used the same identical (separate) cables as those listed on their own.
I was just too good a deal, the three suppliers listed in the heading of this post will need to wait till next time.