Thanks for this, I downloaded the pdf (right click the link, save-as). It sounds like a really good kit to use.
This bit is interesting- "The designer’s preferred setting for his amplifier, which has a 47K input impedance, is 6K."
I think what this is telling me, is the total resistance of the source+ldr+cables should be 6k (or less) in order to match well with 47k amps.
My amps are 47k, the Killer 3k. I wonder that the measured resistance is after the Lightspeed? I'll check it, when I get it back.
