1) Chicago television program 2) Reliable platform 3) Solid way to travel 4) TV shooting set 
The area between two speakers that appears to the listener to be occupied by sonic images. Like a real stage, a soundstage should have width, depth, and height.
A listening term that refers to the placement of a stereo image in a fashion that replicates the original performance. A realistic soundstage has proportional width, depth and height. 
The position (front/back and high/low) that music or sound appears to be originating from, as well a
A large area (usually in a studio) where elaborate sets may be constructed.