How much is "more room sound"? Preamps only amplify what the mic picks up - yes, the quality of the sound can be affected by the preamp, but more room sound is not really a "quality of sound" issue. Is the volume level outside the booth the same and can you verify with an SPL meter? Anything in the booth change at all? Same vocalist - since a weaker vocalist means you have to drive gain higher which would pick up more room noise. Vocalist distance to the mic the same (same gain issue). Same type of music? Headphones the same or possibly getting some more leakage? Maybe the headphone monitor mix s louder and leaking into the mic?
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