They say they don't have an example of a djed, so they don't know what is really is.

We have a big huge pyramid djed.
Here are some pictures.
[link to www.ancient-origins.net (secure)]

That pointy thing in the kinds chamber is a djed.

So likely some type of power source?

Some type of resonant tower. Maybe even the ark was made to work with the pyramid like Solomon's temple did.