<< Makes sense to me that speakers, computer or hi-fi, could benefit from a breakin. After all, they reproduce sound by the physical movement of the cone surface. I always break in speakers by having them play some variable/nonrepetitive music/speaking very softly for 24 hours or so, garaudally increasing volume. I don't use white noise because I want a varying range of sound-to flex the speakers differently.
It may be an urban myth, but my experience has been that speakers last much longer if this is done. And it costs what three cents in electricity? I'm sure it doesn't hurt the audio capabilities either. >>
I don't know about it making the speakers last longer, but I always like to run new speakers at lower-mid volume levels with varying frequencies for a day or so as well.
My philosophy on the matter is: It can't hurt, it doesn't cost much, and why does anything else said about the matter involve long drawn out discussions about how it can do marvilous things, or your insane and need to see a psychologists. The bottom line is feed good quality speakers with good quality signals and breaking in won't make that much difference anyway.