ISSUE Q&A
A hum can be heard through the channel with the DI box
Flip the ground lift switch
Ground lift switch: Used to eliminate the hum caused when you have a grounding problem that’s made evident by a looped signal
Control Feedback In a Sound System
Youtube: How to Prevent Feedback on Stage by Sweetwater
Point speakers away from mics.
Point mics away from speakers.
If you have control over EQ, put a notch at the frequency that's causing feedback, in the speakers that are causing problems.
Make stage area quieter than the audience area by putting the PA speakers in front of the band
The band hear themselves through monitor speakers, which are quieter than the PA, and which can be EQ'd to prevent feedback.
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