I bought the Massdrop Plus IEM. 10 ohm impedance at 1khz. Apparently it gets lower and higher than that, because frequency affects impedance. I dont understand WHY frequency affects impedance. My source is currently an LG V20. Output impedance at 6 ohms. Does frequency affect output impedance? I'm pretty sure load affects output impedance. And then the final major question: What is damping factor, and how does it play in to all this frequency vs impedance vs output impedance stuff?