When i play an open B, my low E string rings out. its quite annoying. maybe its a setup problem? or is it normal?
It's probably a technique thing, but it's definitely not normal. Try using your palm to mute the strings above the B. Not heavy like a palm mute, just sort of rest it on the strings enough to stop them from ringing.

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its normal its called sympathetic vibration or something like that its the string vibrating from the frequency of the open b just mute it when you strum