Anyone heard the KR Enterprise Antares????

The Gizas are 20" x 14"

That would probably work pretty well then. Cheap too!

Another support possibility is a custom sized Neuance beta shelf. You'll need four cones under it, preferably ceramic(but not necessarily, YMMV). A Neuance will bear the weight and probably offer pace & clarity into the bargain. (costs less than $200, I believe).

Where do you get the Neuance? Do they have a web page? Also, I remember now what my concern was about the Osiris. I once cosidered for my speakers. How wide are the Gizas not incluiding the extruded supports? If it's 12" or less, I don't know that it would work.

Gizas are 14" wide not including the extruded supports at the corners. When it comes to amp stands, there are many quality choices to choose from.

What type of wood does Tyler Acoustics use in their stands?

Thanx.