Most common questions used to investigate
Is your guitar very close to the amplifier?
Is the gain on your guitar or amplifier turned up high?
Is your amplifier very close to the ground or walls?
Is the volume on your guitar or amplifier turned up high?
Is the treble on your amplifier set to very high or is the bass set to very low?
Common conclusions
Your amplifier is creating feedback because your guitar is too close to your amplifier. Make sure not to place your guitar too close to your amplifier and position your guitar away from the face of the amplifier.
Your amplifier is creating feedback because the gain on your guitar or amplifier is too high. Try to reduce the gain to get less feedback.
Your amplifier is creating feedback because it is too close to the ground or walls. Try to place your amplifier away from the walls and elevate it from the ground.
Your amplifier is creating feedback because the volume on your guitar or amplifier is too high. Try to reduce the volume to get less feedback.
Your amplifier is creating feedback because the treble on your amplifier is too high or the bass is too low. Try to reduce the treble and increase the bass to get less feedback.
Unfortunately, we were unable to find the problem causing your amplifier to create feedback. If the problem persists, consider taking your guitar and amplifier to a professional technician for further examination.
References
https://www.wikihow.com/Get-Rid-of-Feedback-From-Your-Amp
https://www.bartlettaudio.com/pages/how-to-reduce-feedback
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