Rule of Thumb to memorize:

"At Audio Frequencies, we can always safely jack a Low Impedance signal into a High Impedance input, but we can not get away with doing it the other way around. High Impedance signal presented to a Low Impedance input will load the signal down and change things."

This is why you can plug the nominally Lower Impedance output of say, your MIDI piano, into a Guitar Amp and be safe and secure with the knowledge that it will still sound pretty much as it was intended to sound, but if you were to plug a Guitar with passive electromagnetic high-impedance pickup into the much lower impedance input of many Keyboard amps (or MIXERS), you are going to load it down and change the way it sounds. Also you will likely realize much less amplitude than you should, which is a clue that something is wrong. (If you have to put the input gain "on the pin" all the way up and just barely get enough signal to excite the amplifer, something's WRONG.) Just because you can hear the signal does not mean that you are hearing the *correct* signal.


--Mac

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