XPA-3 depth?

[sl1800]

I'm looking for a spec I can't find. I know the depth of the unit is 19" but what is the depth from the face of the unit to the back edge of the rear feet? This will be less than 19" but how much less is it?

[frenchyfranky]

It must be something like 17", the binding post are approx 1" long and the edge of the rear rubber feet approx at 1" of the back side.