I recently bought a Randall RG75DG3, and the sound is amazing

But when I have it on the overdrive channel, and don't play (Volume on guitar turned down to) it's coming loud sounds, like a car engine and a "screaming" sound in the background. I hate that because sometimes when I play, that sound is in the background to.

Is this normal, or should I return it?
you mean feedback?

lower the gain, face the amp away from you, and stand a little farther from the amp.

try the amp with a different guitar.

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