Holy smokes man, I just noticed the shipping weight of my XPA-5 is 88 lbs! That's heavier than I thought...Hopefully I'll have it in hand tomorrow.
I think that's with packaging. The actual net weight of the XPA-5 is 70 lbs.
Still not bad though for an $800 5-channel amp at 200 watts per channel.
But if you want heavy, about A McIntosh MC2KW at 437 lbs (1 channel only, 2,000 watts on three chassis amp). Only $30,000 each monoblock!
Or about an Edge Electronics NL Reference at 440 lbs (2-channel amp, 800 watts x 2). Price of admission is $125,000 each Stereo amp!
And finally, the Krell Master Reference at 677 lbs (monoblock 1 channel only with 1,000 watts into 8ohms & 2,000 watts into 4ohms). That will set you a cool $75,000 each!
Multiply that Krell by the new Audyssey DSX (Dynamic surround Expansion) in an 11.2-speaker system configuration, and you'll need eleven of these puppies, not including the two or more gigantic powered subwoofers to match that; and just for the power amps, you'll need a floor able to support 7,447 lbs or 4 tons with the stands!

Total cost only for the amps: $825,000. PayPal please! I don't think so.
Did I heard someone murmuring "OUCH!"?

Better have a good solid rock foundation under the house.
Bob