Vivid Kaya 90s are 87 lbs, the Kaya 45s are only about 57lbs. "Full Range" is tough but they both extend well below 40hz and will give very satisfying bass and are easy to place.
Even lighter is the Spendor D line. The D7.2 is 48lbs while the D9.2 is 80 lbs
These are the lightest larger speaker that I know of.