Quote:
Originally Posted by keezzzz  Burn In is a myth, something between the ears.
When parts of a driver/speaker will loosen, then he is broken.
|
srsly?
Did you read the post linked above?
you have nothing but faith that a demonstratable occurance does not exist. I have faith that if you cross a busy street you wont get hit.
Quote:
Originally Posted by bangraman Gradual degradation of drivers by environmental and wearer effects (sweat, etc) affecting the sound is not a myth.
|
Did you look at the link either?
Who in their right mind touches speaker drivers?
Quote:
| In terms of long-term ownership, it could be argued that you should use a phone (on-head will have far more effect that an off-head continuous playback for reasons which should be obvious) to get the true flavour of it's long-term-use character. |
Indeed, I agree. "first kiss" impressions of even "burnt in" (or well used, if you want to take faith in the nonexistance of burnin)
Quote:
| As we know with some low-cost dynamic in-ear drivers, some give an accelerated example of this by degrading quite alarmingly with regular use, mainly through moisture absorption. The same, but to a lesser extent, happens with most headphones. |
can you post a reliable source for this?
Most low cost headphone drivers I know of are mylar or other plastics: materials not known for being particularly sensitive to water absorption.
Quote:
Originally Posted by murfy If burn in is due to a mechanical change why don't people find the sound continues to change due to any suspension plastic deformation? Wouldn't the changes continue after the 'burn in' period? They surely can't just suddenly stop?
|
Quote:
Originally Posted by aimlink I don't think anyone would propose that they stop. More that it's less than it is as when the material is brand new. So much less, that it's inaudible or of much less significance.
|
NO!
There are physical reasons that the "softening" stops after a certain point.
Think of a leather shoe. you get it and its very stiff. you wear it for a day or 2 and they begin to soften up a touch, a few more days and they soften some more. After a certain ammount of wear the shoe no longer gets any softer. You continue to wear your comfy leather shoes until the soles wear out. Have you ever worn out the LEATHER? The part that softens as you wear them.... maybe once out of 20 pr of shoes? Perhaps if the leather was exceptionally thin as on certain sporting equiptment. but how often really...
The thing everyone has experienced from the above example is work softening. Unless the work softening causes the material to be weakened excessively (which can be designed around if you have half of the knowledge necessary to design a shoe or headphone driver) The process of work softening continues to a certain point, after which it levels off and is farly constant for the life of the piece.
Work softening of plastics and rubber is similar to work softening leather in the regard that the material softens to a certain point and then more or less levels off, as can be seen in the data posted on the previous page.
The foam surrounds on speakers do not "wear out" from usage: speakers that are treated kindly (not tested for Xmax on a regular basis, such as may happen in a dance club...) last until the foam suronds rot out due to the natural degredation of the material. Guess what kiddies? It takes roughly the same ammount of time for foam surround on the shelf to crumble to dust as one in a speaker which is in constant use (within respectful limits)!
Quote:
Originally Posted by Seamaster After 5176 posts, you have not figured the wohle thing out yet? I suguest you should stop so much talking and start doing.
|
Doing what? I lack the means to scientifically measure a headphone in any repeatable way, and generally stay out of these discussions. I got into it for the express purpose of mocking you. I do believe in burnin as it is supported by measurements where non-burnin is not.
As it applies to headphones it should be farly easy to test, but nobody will listen to you. thats about where you are now, so I'd get to it.
Get 2 pr of identical NEW headphones.
Measure them both on a test jig fresh out of the box. Verify that FR graphs are within accepotable tollerances. Perhaps take 3 measurements alternating and average. Headphone measurements are subject to error based on placement on the test instruments after all.
put one back in the box as the control sample
run the other for 48 hours with white noise at ~72db.
repeat FR test
repeat for several weeks.
Publish your findings.
I am fairly confident that the test headphone (the one being burnt in) will change FR for a bunch of time but towards the end level off and clearly stabilize at its final FR.
What I am not sure about is whether the effect will be observable on all headphones.
One of the oft cited issues with burn in is that if the MFR burns the speakers (headphones) in for you he can easily state that the way a speaker sounds on day 1 is the way it sounds. For his product that is true, for anyone else's not so. It is a strong competitive advantage to a builder to have this under his belt.
Quote:
Originally Posted by Dustin The Wind I have a question- has anyone ever bothered to contact one of the engineers who designs headphones and asked THEM? It would seem that there is no better expert than the person who actually created the cans and had to take into consideration this "loosening" of the drivers. If it does exist, I'm sure that the engineers account for it when designing.
|
people have. It depends on the headphones.
Senn claims there is no burnin.
Well respected individuals have commented on the necessity of burn in for AKG's
John Grado burns his personal headphones in by hooking them up to a speaker amp and rocking them.
