Highest frequency that cannot be "localized" by the ear?

[theaudiohobby]

Resident Loser,

In the diagram I originally to linked clearly shows the bass heavy instruments are spread across the front of the conductor, however I have taken liberty to link to one of yours (Pacific Symphony Orchestra), the diagram is not much different from the original one I linked, The Horns, Timphani, Piano, and Kettle Drums (Percussion) are all to the left of the conductor. I have to dash but you get the gist, your basic premise is wrong, bass is not balanced to the right of the conductor, it is spread across the front of the conductor.

PS: I have linked to another of pictures, with a complete different layout, but original premise still holds, the bass laid out across the front of conductor.