Why does my KNA piezo pickup work with most amps and mixers, but not all?

Your piezo pickup probably works with acoustic amps and mixers but may not work with amps designed for electric guitars. To recognize the input signal, these units require a certain level of input impedance, which is available from magnetic pickups and preamp-powered ones, but not with a piezo. The piezoelectric design, the primary technology KNA uses, doesn’t have that input impedance. You’ll need to connect to an additional piece of gear, such as a DI box, preamp, pedal, or wireless system, before going into your electric amp.

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