I think it is safe to assume that Chicago's Cathedral went through a horrible "wreckovation" in the 1970's which was typical for renovations at that time. I was there for the first time this summer and couldn't believe the horrible stain glass windows of the 1970's which replaced more traditional windows. The ambo is so far left of the main altar to appear almost insignificant and it is so high that when the lector read from it, you could barely see the top of her head!
The bishop's throne was dead center where the old traditional altar/reredos once once.
However, Archbishop Blase Cupich has resituated the throne and it is a vast improvement! It is now to the left of the altar and behind it. I think I would have placed it similar to where the throne is at Savannah's cathedral which would be forward a bit toward the first pillar in the sanctuary. But the new configuration by Archbishop Cupich is a vast improvement!
I hope one can tell by this picture at the visitation for Cardinal George: