here's link to the thread where I pinched the idea
http://taperssection.com/index.php?topic=96074.0Looks like the pics are gone but the values for the resistors are still there. The schemo came from the same site you mention.
I built those cables for running my V3 in front of my R4 analog in before I got it modded. What I was trying to achieve was to match up the V3 meters with the meters on the R4 ( I hate the meters on the R4) so I had to knock off the extra +23 from the balanced outputs.
IIRC I used 2k2 and 150 just like Jon suggested and got around 23dB of attenuation. I used cheap resistors but I matched them up as best I could.
Building them into the connector was not difficult. I made it on the first try....I sodered them onto the wires first and figured out how to get them situated in the housing so that nothing could short out on the housing before soldering them into the connector pins.
I remember that one of my audio geek buddies, when I was showing off my handiwork, commented that jumping the pin to ground with the shunt resistor was faulty circuit design but we were drinking and all of his jargon was way over my head. I THINK I was using the U-pad diagram from the uneeda-audio link but it's been a couple of years....
I'm out of the cable making biz for a while and have let my stock dwindle down to what I need to support past customers so I can't really offer to build any right now.....but I'm really surprised that Darktrain, Ed or Naiant hasn't added something like this to their product line. Building battery boxes and attenuators and such is not really all that hard. I'm surprised more people don't do it at home.