i think ajax has answered the first part..

as far as the diameter of the terminal hole, it is a rectangle shape, about 2 1/2 to 3 inches wide.. if you are gonna mount them flush to the wall, forget about trying to use banana plugs.. there isnt enough room.. i tried... well, unless you can find some smaller plugs than i used?

good luck!!!

bigjohn

EXCUSE ME, ARE YOU THE SINGING BUSH??