+1 on immathewj's response about lights off, eyes closed, although I take off my glasses only sometimes. When I cannot see the physical objects in the room, it tricks my combined senses into "seeing" a wider and deeper soundstage, as I am depending solely on my hearing unaugmented by sight. I've been doing this since I was in college. It also brings back memories of the mostly classical concerts I have attended. I have a performance of Beethoven's Sixth Symphony (the Pastorale) that can almost convince me that I am back in the Berlin Philharmonic's concert hall of the late 1970's hearing Karl Böhm conduct. It enhances my listening experience. YMMV.
