50-22=28

Lets see, take the delta W(in lbs cause I'm in the US where the gram is grim)times the inverse of the square root of 2(these are speakers so we want an RMS value) Then if we subtract the delta SPL corrected to std. day, (OH oh, don't have those numbers, we'll have to estimate-what's the avg temp and barr at NRC?) NO!! We can't DO THAT, accuracy is everything! (YES-you heard that from an M50 owner)