If you hear hum when plugging a keyboard into your mixer, how can you fix the problem?
A) Power your mixer and the instrument from separate circuit breakers.
B) Enable a compressor on the keyboard channel.
C) Power your mixer and the instrument from the same outlet strip.
D) Turn the keyboard way down in the mix.
E) All of the above.

Question

Quizplus · Accepted Answer

Powering your mixer and the instrument from the same outlet strip can help eliminate ground loops, which are a common cause of hum in audio systems. This ensures that all connected equipment has the same ground reference, reducing the likelihood of hum.

If You Hear Hum When Plugging a Keyboard into Your