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

Hand truck or end over end in their boxes.Either one is not difficult if you're slow and careful.

A hand truck with pneumatic tires. You also NEED one or two CAMLOCK STRAPS to hold the item to it.

i was pondering tonight... what are friends for?  then i saw your thread  :)

imhififan actually posted a link to a very unique hand-truck.  I actually have not seen one like this.  The problem with most hand-trucks, even if they have large pneumatic tires, is that you still have to have an enormous amount of lift to get the hand-truck up each step.

This hand-truck from northerntool has a 3-wheel rotating assembly.  Watch the video in that page.  It's worth $100.

https://www.northerntool.com/shop/tools/product_200737655_200737655?cm_mmc=Google-LIA&utm_source...

It actually looks like it's back-ordered on Northern Tool.  It's also available on ebay for $99 + $22 shipping.  Just search for "Strongway Stair Climber Hand Truck".

There are other places on the web that sell similar 3-wheel hand-trucks.

+2 on northerntool, but if not then a regular one much less chance of hurting your back than these other ideas , particularly the " amp ambulator ".