One thing you should know about the Julian Schnabel-directed concert documentary Lou Reed's Berlin is that Lou Reed has personally instructed theaters to play the film at concert-level volume. That means it's really, really loud. When I saw it (at NYC's Film Forum, which is following Reed's command throughout the film's limited engagement), an elder woman walked out. Of course, I can't be sure that it was due to the sound, though the exit was during one of the loudest songs.
The volume may seem excessive and unnecessary to some, but at a time when concert docs are shown in IMAX and/or in 3-D, it really helps a film like Lou Reed's Berlin compete for audiences seeking a filmic experience comparable to the real thing. And leaving the theater with your ears ringing will help you think that you were actually there when Reed performed his 1973 album Berlin live for the first (and second, third and fourth) time in Brooklyn, New York, December 14-17, 2006.