Build a wooden crate or use a cardboard box for Amplifier.


We are moving and I have two amplifiers that do not have boxes. My concern of course would be damaging the amps during the move. I am probably going to be storing them for a couple of months. The amplifiers are Krell KSA 200s and a KSA 300s. Does anyone have experience in building a crate that they good lend some guidance ?
I have a full wood shop and are pretty capable.
Or would I be better off with cardboard boxes reinforced.
Any Help is gladly appreciated. 
Thank You.
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You can also use expanding packs. Get a heavy double or triple thick cardboard box with at least 2-3 inches all the way around. Make it if need be. Just cut down from a HEAVY Refer box or something like that.

Use reinforced fiberglass tape to hold it together.

Put heavy styrofoam blocks in place to center the amps in the box. Tape them in place.

Get  heavy plastic bags and bag the amp. Set your expanding packs in place. Place the amp on the taped styrofoam and set off the bottom foam bags.

Set the top bags, set them off, close the box, but don't tape it.

Inspect your work after they set up and see if they need trimming or an XTRA bag or two

https://www.uline.com/BL_7708/Instapak-Quick-Room-Temperature?pricode=WB140&AdKeyword=expanding%...

If you really want to go nuts build a 1.5 - 2 x 4" external frame with screws and glue. Remember don't glue what you're gonna take apart to get the cardboard box out of the wooden crate (has open slats).

I did the exact same thing BUT the inner box was lined with heavy felt and it was made of 1/4" ply wood and held together with leather belt straps..

I used that set up for 10 year traveling. Everything fit and was strapped to a dolly. A pair of MC30s and a C20, and all my needed STUFF. I NEVER broke a glass in all that time.. I worked on sea going tugs and mobile drilling platforms. It got rough out there sometime, pulling some nitwit off the rocks or foul weather hit...

Remember the Santa Barbra and  Exxon Valdez, I was there for both cleanups, what a MESS..

Regards
I double-cardboard boxed my PrimaLuna integrated using using plenty of foam and bubble wrap. It successfully made it across the seas by freighter with all tubes plugged in and intact.
In my industry we receive heavy weight pumps in a reinforced double thick cardboard boxes. The pumps are typically bolted to a plywood bottom. This keeps them from moving around and getting damaged in freight. 

You could cut a plywood base to sit in the bottom of a heavy duty cardboard box. Set the amp in the middle and put a 2" piece of foam panel on top. Take some perforated strap and run it across the top and use shallow wood screws to pin it down to the plywood base plate. If you get it sufficiently tight and use a box with a few inches of play around the outside of your amp it should be sufficiently sturdy for transport. In my mind at least 
You need to consider how you expect the carrier to handle it. I recently shipped an amp, but it was only 28 lb. I built a crate and used a single metal gate handle for it to be carried suitcase style. After going from AZ to MI and back, I was amazed at it's condition on return. (FedEx) It looked like it only went around the block.

If it is going to suffer impacts, wood will transfer more of the impacts v. cardboard, so you need to cushion the inner carton well. But a Krell is probably heavy enough that it won't be getting tossed around. I would assume hand trucks are going to be used and build to make that easy as possible. If it has to ship flat, I'd assume vertical forces are of the biggest concern, so you would want sidewalls capable of supporting a top panel that prevents any kind of crushing. Maybe wood sidewalls and OSB top & bottom.

If it can ship vertical with the heavy end at the bottom, I would do a riser on the bottom ends that allows a hand truck to easily grab it like a pallet. I found it to be quite the engineering task, with many considerations to factor in. Obviously you want to keep size and weight in check, ensure maximum protection, build it so it can be easily unpacked and repacked and the easier you make it on the shipper, the better it will be for your equipment. Insure for the maximum and slather it with"this end up" and handle with care stickers.



Contact Krell and ak if they will sell you a packing box for your units. A lot of manufacturers will do this. I know McIntosh does. You would pay for the boxes but they are designed for your particular units. FWIW