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i watched a video where they used one of these in a guitar as opposed to having a pickup; here is the link https://youtu.be/vVQPE5c1XLA?t=5m52s skip to 8:10 to hear the quality
you connect it to any xlr input on an amp or something. you could buy and adapter. or you could just wire the speaker to a standard output jack and use it with a normal instrument cable