"I unboxed the top cabinets... that box alone was about 80 lbs!"
Yep, those head cabinets are cast from a stone-like stuff called Novalith. HEAVY! One thing I had to do to mine was replace the dual bananas that connect the tops to the bottom cabinets. The plugs lost their spring and would not fit snugly.
If you don't have the manual, I would suggest requesting a pdf copy from Aerial Acoustics. It is pretty comprehensive. There's a lot of in-depth info about placement and important stuff like how to properly place the heads on the bottom.
mkelly @aerialacoustics.com