Did you weigh them during high or low tide? Was the Sun at perigee or apogee? Do you also experience more bass weight in the heavier speaker?
Seriously, I think they more than likely have a +/- tolerance level and the shipping is not an exact weight.
Call the dealer and ask.
Seriously, I think they more than likely have a +/- tolerance level and the shipping is not an exact weight.
Call the dealer and ask.