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When I use the stereo cable and separate amps for the magnetic and piezo pickups I hear a pretty serious hum. What can I do to get rid of this?

April 26, 2017amps cable hear hum MAGNETIC pickups Piezo Pretty separate Stereo

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When I use the stereo cable and separate amps for the magnetic and piezo pickups I hear a pretty serious hum. What can I do to get rid of this?

1 Answer

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You have what is known as a ground loop. This isn’t the fault of the guitar or the amp. Ground loops can occur whenever two pieces of electronic equipment are connected. Use a Direct Box with a ground lift to isolate the two amps. Plug the Magnetic end of the Y cable into one amp, and the Piezo end into the Direct Box. Plug the Direct Box’s output into a balanced input on the second amp. Do not disconnect or otherwise attempt to defeat ground connections on your electrical equipment.