I received a reply from Sweetwater.

iP12B - 49.2 lbs
iP15B - 58.0 lbs
iP500 - (not measured yet yet) @ 180-degree horizontal
iP1000 - 54.7 lbs @ 180-degree horizontal
iP2000 - 67.7 lbs @ 180-degree horizontal
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"You Shall Know the Truth, and the Truth will set you free." John 8:32