Please, this is getting painful. Someone tell Sam Tellig that there is really no such thing as a passive preamplifier. I don't care if someone in the 60's said it or a caveman said it. JA is 100% right.
Now ST is saying that a passive device can have gain. What? No it can't, please give this poor man a high school physics book.
And Sam, the theoretical speed of electrons through a wire is..... guess what? The speed of light, so an attenuator that calls itself "Light speed"? I have a lamp cord that works at light speed too.
I'll give you that you can hear the difference between two sources when both are batteries if it makes you happy but I have strong doubts about that too.
Someone come in and save this guy!