When I was finishing a subwoofer which I had been build under the floor of a living room, as a last I was installing the amp in the basement. While pulling wires the home owner came, took up the D-amp and shook it, then he asked what that was: "Empty case or what?"
He did not belive that this 3kg thing could do anything as I had promised it would do. " It's just air inside!"
When I ran a few tests, the windows on the upper floor started rattling and his fat wife came down the stairs, hystericaly crying. That convinced him of light amps doing heavy bussiness.. Was a Behringer iNuke with integrated DSP. The two 10" used the room as a horn. Worked better and lower than I had calculated.
Over the years I saw loads of "High End Specialists" checking the weight of any gear before giving useless, stupid comments about the sound quality of things they never heard performing.
If you are too stupid to understand how something works, measure it's weight...
Hey, what about boa sized loudspeaker cables?