Originally Posted by WallyWest
Not entirely myth.
A brand new driver does take time to break in. Epoxy is used in the construction of most drivers, to hold the spider together.
Ever done loudspeaker driver assembly? The most common adhesive that is used to assemble speakers, particularly surrounds and spiders is probably PVA. PVA generally sets to something that is too flexible to crack.
For example: http://www.enjoythemusic.com/diy/110...ker_refoam.htm
"Normal glue sold with speaker surrounds is PVA, and is non-toxic and water based." The spider is just a second surround.
When you first start using the driver the spider is fairly stiff, but over time the epoxy develops a spider web pattern (haha) of tiny cracks that loosen things up.
I've heard this myth before: Micro-cracks. The story used to be that playing digitally mastered LPs caused micro cracks to form in turntable platters. Next!
Bottom line is the T/S parameters of most drivers are measurably different after break in. Sometimes by a large margin.
Let's say that T/S parameters do change when a driver is first operated for whatever reason. Where does that happen? Again, ever been in a factory where they assemble speaker systems? Do you know how much testing of drivers and systems takes place as part of normal assembly? Do you understand that this testing is often some of the most torturous use that the speaker driver ever gets in its entire life?
So how should you break in your speakers?
Let the factory do it for me? ;-)
Just use them, there's no magic CD you need to play. I might avoid driving them to really high levels right off the start, but that's even debatable. You may or may not notice the changes as they break in, but there's nothing you need to do differently during that period.
Hmm just like your dad broke in the engine in his 1955 Oldsmobile...
Also, the few people I have talked to about this in the speaker building business actually run their speakers in the factory for 40+ hours before shipping them out. They don't want people hearing the changes and thinking something's wrong. I don't know how widespread this practice is, probably doesn't happen for cheaper speakers, but it's possible your speakers are already broken in when you unpack them.
Now you finally tell the same story I just told above. What these people don't want is DOA or infant mortality. The rest is romanticism. DOA is not romantic. Break-in does sound romantic. And, the myth worked! Look at how many audiophiles believe in it!
The myth of component break in is most frequently spread by audio salesmen, and the benefit to them is that the new equipment sticks for the full 30 day in-home trial. Don't like your new turntable/CD player/amplifier/speakers? Just wait for them to break in! ;-)