Say I have a signal driver operating at 50 ohm output impedance, driving something with high (hundred kilo-ohm) input impedance. If the wavelength I'm using (a few kilohertz) is much longer than my chord length (a couple feet), then I understand that standing waves cannot develop..
But, do I need to worry about the reflection causing damage to my driver? I guess a back-reflection always occurs if you have an impedance mismatch. Why do we usually only worry about this sort of thing when standing waves are possible, typically at 'high' (RF) frequency?