Breakin Myth?

Loudspeaker break-in is not a myth, although some drivers benefit from it a lot more than others.  The theory is that the moving parts like the spider and the surround can be stiff right out of the factory and will move more freely after use.  The theory is that the sound quality will improve.  Some people say that a speaker can be damaged by maximum power if ti is not broken in first, but this is really questionable and if there is any misinformation going around concerning break-in, that might be it... but it does make some sense to not "hit" a loudspeaker too hard when the surround is "stiff.

In my experience in professional sound reinforcement, in car audio, and in home theatre installations, there is truth to the rumor that allowing a break-in period for a brand new driver before using it in a critical listening situation DOES improve the sound quality.  It also, especially with mids and tweeters, does seem to increase the available SPL.  I have even heard improvements in subs, although not really that much since SQ improvements in sub-woofer frequencies is difficult to discern.  But I can tell you that subs seem to move much more freely after a break-in period, and that response time and SPL does seem to increase.

every company has their own reccomended "breaking in" time and will tell it to you upon request for your model

My question is why wouldn't you break in a sub.  I mean let's see if you break it in for a day then you have done something that could possible prevent blowing, distorting your subs.  Why wouldn't you just take the time,  maybe will make a different and maybe it won't, but it's better safe then sorry. Just my 2 cents