Hi I have a dynamic omni mic and a preamp. The mic is rated 500 ohm impedance and the preamp input is 10k ohm. I read on a website it is ideal for a mic/pre to have a ratio of 1/10 impedances but my setup is 1/20. Im just trying to figure out ways to lower the noise floor before recording as my current noise floor is workable (-51dB) but still a pain when tracking and compressing. If I increase the impedance the pre sees to 1k ohm is it possible to lower the noise? I tried a test on my preamp, by recording it's input into my wave editor, but I didn't plug a mic into the pre, I only completed its circuit with a variable resistor. I noticed that at 10k ohms the noise floor was about -48db, but turning the resistor all the way open to 0 ohm the noise completely disappeared, no signal at all. What can I do to lower the noise without having to use the digital FFT noise reductions?