Suggested impedance Dynavector 20x & VPI

I've still not be able to figure out this whole cartridge matching thing, I know, I;m slow. I have; the 20x high, VPI Scout with JMW9 arm. BK Pro10 preamp and a Phonomena on the way, so I can play with the settings. The Recommended load Impedance: >1000 ohms. What does that mean? I have the Pro10 in MC mode, but I still have to turn the volume up to roughly 1:00pm. Will me setting the Phomomena to say 2000 ohms allow me to lower the volume? What would your suggestion be? I can set it too; 2000/5000/10000 ohms. Would any of those setting hurt anything? Thanks in advance.