Ok, I received the 2 plugs that just contain a resistor and the 1 plug with just a capacitor.
As much as I wanted to like the London Reference at 15k or 33k, in my current system it sounds best at 47k.
Adding the capacitor to bring to total capacitance to 220pF, however, has a very positive effect. As I said above, "the music becomes more coherent. I get a better sense of where the musicians are and what they are doing. The music is also slightly more nuanced."
As much as I wanted to like the London Reference at 15k or 33k, in my current system it sounds best at 47k.
Adding the capacitor to bring to total capacitance to 220pF, however, has a very positive effect. As I said above, "the music becomes more coherent. I get a better sense of where the musicians are and what they are doing. The music is also slightly more nuanced."