SPL level is very small room help needed

Hello,

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I have a very small studio and have just setup the BX5 monitor speakers. What SPL level should I set my monitors to? I am about 3 feet from the speakers so 85db (according to google search) is going to be way to loud from my listening position. Also, when I measure the SPL should I have the volume knob on my focusrite interface all the way up or half way up?

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Thanks,

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