Understanding how impedance relates to frequency response is kind of critical. The stuff goes so deep I definitely recognize as a sonar technician in the Navy that I'd be getting in over my head if I even attempted to understand all this stuff. Here's a pretty cool article from MIT on this subject.
Watch out for all those red herrings out there.
https://ocw.mit.edu/high-school/eng...onics/lecture-notes/MITHFH_lec_impedances.pdf
If you just want to be a quickie repairman without the ability to engineer something then ITT Tech does offer courses.
If you want to master all the nuances of sound and the human voice as well as RF engineering and Sound Engineering and electrical engineering to be able to manipulate your sound in a transmitter now you're getting into a really deep subject that requires a lifetime of study.