15" is deep enough

Sheesh! About 12-13 years ago our amps were a design that was about 28" deep.

Dealers didn't like them as they didn't sit on shelves well, which really isn't where they were intended to sit.

Apparently a lot of people liked the look, so much that we've gotten orders for amps built that way now (google Atma-Sphere Silver Edition for an example).

@sbank only if they say McIntosh on the side. :)

Over 9" is already too deep technically LOL!

Schoenberg is too deep for me. 

I personally think amps should sit on the floor between the speakers and like them to be deep and narrow.