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Microphone Month 3

MIDI Ground Loops

Q: I’ve often wondered; is there a problem with MIDI ground loops in a large keyboard/synth rig?

A: Typically not — at least not from the MIDI part of it; audio and digital audio interconnects, and AC power are other matters entirely. The reason is that the MIDI spec requires a telescoping shield on MIDI connections. This means that the ground is only connected on one end. You still get the benefits of shielding, but there is only one path to ground per MIDI connection.

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