shipping boxes for heavy electronics

Elizabeth is right. However, for best result you need padding between both boxes. Logic does wonders. I've done many. Logic didn't always work with other issues, though.

At some point you need to use wood/plywood on a pallet to insure safe transit. The big 3, usps, ups, fedex have a poor record shipping our expensive and cherished audio components. Good luck collecting for damages also. I have had a couple of nightmares via UPS, they delivered a set of speakers to Florida and left them out in the open to soak up the afternoon thunderstorm. The gorgeous finish on the monitors was trashed, cones soaked- a total loss. They tried to blame me saying they were poorly packed. I got $400- for $2k speakers.
If you want it to get there safely, go freight.

Thank you everybody for replying. I ended up buying a box from UPS store that is able to withstand 80+ lbs. And of course the UPS store guy said why don't you just let us pack it for you.

I told the UPS store guy that I have had bad experiences with them before, and proceeded to take the box to FedEx and have them pack up for me. heavy bubble wraps all around. No heavy foam however. This will be a lesson learned. And I hope it will get to Parasound safe and sound. I have had ok experiences so far with FedEx and hope they will be careful. The package has fragile stickers around all sides and package exceeding 70+ lbs sticker as well. on the receipt itself it was marked fragile also. I am worried now though hearing about the insurance nightmare issues. keeping my fingers crossed.

Thanks again for everybody's feedback. they are very valuable. Time to load up on some foams!

ULINE has double wall maybe even triple wall boxes, gatta buy them bundled though.

When using a pallet, ask the shipper (or do it yourself) to attach cardboard pyramids to the top of the box(es). this is a very common technique (trick) used to prevent carriers from stacking other stuff on top of your shipment ;~)