How to physically move large heavy 100lb amplifiers easily (up and downstairs)

Hand cart/dolly might make the most sense. One step at a time.

Or - - find someone with a strong back and a weak mind - ; )

Need two, one under each arm.. or strapped, backpack style,  up the stairs I go.. Just have someone behind you, or tie a rope around your neck.. If you drop the amp, you'll want to jump..... pretty sure on that.

The box it came in strapped to a skit, and "skit it" up the steps, set on your butt and pull hand over hand, with a helper, tie the rope around their neck..  They won't mess up. Just once anyways..

If you don't have the ability. block and tackle, + Skit, is an easy way too...

OR like two people moving a person in a stretcher, two 2X4" 6-8 footers.

I took 375 pounders DOWN a spiral staircase, with a movers back strap. Took less than 10 minutes for the pair.. 30 minutes of prep... holding to rope rails with knots.. one step at a time. 12 steps a flat, 11 steps to the bottom.. 20" arms and 25" thigh, steroids do works. :-)

Regards

The easiest way is to invest in long speaker cables.