I'm polling the collective wisdom of the board. Here's the question (with background): This weekend we played a party. This was my first gig with my new head/cab setup (instead of my 1x12 combo) and I was looking forward to cranking up the head and seeing how it and the 15 sounded with some watts going (instead of the turned-way-down level necessary for practice). Because of the threat of rain we set our gear up in a couple of doorways leading out to the back yard instead of on the porch/deck. My cab was in a double doorway with one of the guitarist's Marshall 4x12 and the two cabs basically filled the width of the doorway. Now instead of getting to turn up I actually had to turn down a little. However the sound was awesome. Deep, rich and great. Much better than it had sounded in the practice room. I was in bass heaven. Now I can think of a couple of factors that might have affected things: 1) it was outside so no room reflections and plenty of space to play into 2) being in the doorway I had no walls behind the speaker at all - no proximity effect from that (for practice the cab is right against a wall, next to a PA speaker, kind of in a corner) or last, and most speculatively (I have no knowledge of the possible physics involved here): 3) being setup in the doorway made the room act as a "virtual box" for the speaker - massive volume, great frequency response, etc. So any comments/info on this type of setup?