Why do some specs list wattage/dB at different distances?

Why do some specs list wattage/dB at different distances?

battleroom 0 151
Why do some specs list wattage/dB at different distances?

I never understood this.

I’m sure I could stand 50 feet away in a large room and still be able to hear the speakers at half volume.

I’m sure I’m missing a piece of the puzzle here…

submitted by /u/KillerQ97 to r/audiophile
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