I just acquired the PreSonus Eureka Channel Strip. It has a pre-amp, compressor, and eq for one channel. One of the knobs is the Impedance. From reading the manual, it says to adjust the knob to the impedance for whatever microphone I am using. It also says to try different combos to experiment, but that is all it says. I haven't gotten around to experimenting yet, but I certainly will. I am interested in the why/science behind this knob. What are some general reasons why it would be important to match it, or some reasons to make it different. How does this physically alter the sound in the audio science realm? And last question, will this ever be bad for the microphone or the channel strip, if I repeatedly and purposefully mismatch it? Above all, I know I have to try different things out, and the sound is always the final answer, but I am looking for more information. The internet has yet to help me out, so thank you if you can provide any illumination! Thanks!