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Burn in time, myth or fact???

Discussion in 'Sound Science' started by sonoman, Jan 9, 2006.
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  1. dhruvmeena96
    Burn in only effect the decay, so a very good and tight response set will not get any better and very decayinsh won't get better.


    What burn in does is make the decay smoother overall so it sound more even on acoustic pressure.


    Some iem can change drastically, some will not.

    Some people will not hear change even after parameter shift and some hear even after no changes...
     
  2. Humblepie
    Okay, lets get back to physics here. Decay is based of the physics principle of objects in motion tend to stay in motion. When the voice coil returns to neutral, the sound is meant to stop at that moment. Unfortunately, the driver cone, being a flexible material, is going to continue some micro movements. Think of it like hitting a tuning fork. Striking the fork causes it to oscillate which causes it to continue oscillating until friction through the air force it to stop. This is why if you hit a tuning fork in an absolute vacuum it will oscillate for a much longer time. Of course in a vacuum you won't hear the oscillations as there is no air for make sound waves from, but that is a different matter.

    The rigidity of the cone directly affects the decay as well as as how fast to neutral the voice coil can return to. The voice coil itself also wants to stay in motion and doesn't like to be forced to stop or change direction like any other piece of matter (or anti matter) in the universe. So two factors act upon the decay response. Burn in technically does NOT positively affect decay at all. That doesn't mean it can't "sound" better with burn in, but decay is never affected positively by burn in. Burn in will increase the decay as the diaphragm coating breaks down and the voice coil loosens up a bit due. There is some minor loosening sometimes due to reduced friction in the voice coil assembly directly but so very minor it's almost immeasurable.

    As I said, burn in is literally wear and tear on the whole driver assembly's moving parts which is the cone and voice coil for a dynamic driver. Nothing more and nothing less. The only audible differences caused by this is the coating material on the cone breaking down and allowing the cone to become looser in its response to more movement directions coming from the voice coil. This will cause increase decay and distortion and increased low end response. Again the amount of changes, and how fast those changes occur at all depends on the construcioon and materials used when making the speaker driver. This is literally basic physics and engineering I'm explaining here.
     
    dhruvmeena96 likes this.
  3. tomb
    I believe in burn-in. Why? Because the headband loosens up and ear pads compress over time. Running the headphones with pink noise sitting on a desk does nothing.
     
    bfreedma and dhruvmeena96 like this.
  4. dhruvmeena96
    I said the same thing, it smoothens up the valley of decays. Well you can check that out in non reflecting room. The wear and tear of driver effects decay. The suspension stiffness reduction also effect decay.

    It is just that you won't get a change from extremely tight decay driver or extremely loose decay driver.

    Something near critical dampened driver shows major difference when suspe soon stiffness is eased due to burn and the sound decay is smoothened too...

    Well dips in decay graph are elevated showing less dented and peaky decay response

    The sound smoothens out after decay and this is proven fact.


    I haven't heard anything sounding harsher after decay.


    Why some people claim tightening up of response is that our brain perceive that decay simpler to calculate compared to decay with dips and peaks. So brain processing time reduces, making sound perceiving a little faster and tighter(this only happens in items and headphone).

    Speaker burn in experience only tells more rumble and better resolved mids....


    Bro... You are right but I have done my research... I was intern at sonion, so I got all that knowledge from there.
     
  5. dhruvmeena96
    LoL....true
    But, first check the impedance graph, point out the impedance peaks of your setup first..

    Burn your device with those frequency.... Only that effects.


    Pink noise is a log noise consisting all frequency and is lengthy process as you have to drive at lower volume because it can crack and damage your drivers.

    Burn in means nothing but loosening of driver parts where they are stiff.

    If you burn your device, you only reach the ideal companies reference mark..


    Burn in effects over damped drivers.

    If your impedance shows 45hz and 6khz.. Take those two sample tone and use them to burn it.

    The driver will burn quicker and reducing stiffness from there will lead to extension to lower and higher side..


    Fs can be lowered by 8hz and peak frequency can be smoothened out....


    That's all

    pink noise are for those who can't measure their impedance graphs.
     
  6. 329161
    Thats Not the point.
     
    up late likes this.
  7. Beagle
    Can you also explain why "burn-in" is always seen as positive and never negative? Like, if a headphone was great right out of the box with just the sound you wanted, and then broke in and got smoother or warmer or brighter and you didn't want that to happen?
     
    BobG55 likes this.
  8. up late
    too late for that i'm afraid. the point you are missing or ignoring is this topic has been raised repeatedly in threads and discussed ad nauseam for as long as i can remember. the appropriate forum for this interminable discussion is the sound science forum - not this one.
     
    Last edited: Jun 7, 2018
  9. SilverEars
    In order to be fact, there must be supporting evidence.

    Of course we have the right to believe what we want, but also good to question what is going on as well. Because one may think their perception is absolute reality.
     
    Last edited: Jun 6, 2018
  10. kman1211
    Well I experienced burn-in/break-in turning things for the worse on more than one headphone, but one stood out. The K240 Studio/MKII, it always seemed to gain horrible treble sharpness after break in which wasn't that bad when new, this was the case with 3 different pairs.
     
    Last edited: Jun 6, 2018
  11. Humblepie
    I can give my opinion on that, but I don't believe burn in is always beneficial to the sound at all. My explanation previously about what burn in is, being normal wear and tear that can cause sound changes, is purely a physics fact based explanation of what it is. Now as for why many like the sound after broken in and not before, that is a pure conjecture opinion there. As @dhruvmeena96 pointed out, sometimes the burn in will cause the response to be less peaky and smoother sounding with faster transitions in the music. It does introduce extra harmonic distortion though as well, which many people are probably unintentionally used to hearing and liking. It's not the same level of distortion as when some person puts a 500 watt walmart sub in their hatchback ricer and cranks the volume to the max. It's a resonance distortion that to many people used to hearing would sound natural to them if they are used to hearing that. At least that is what I think. There is also the whole head burn in thing where people get used to something over time. Also the real effect when it comes to people is when someone buys something, they WANT to like whatever it is they bought usually.
     
  12. dhruvmeena96
    Well there are proofs on speaker driver and subwoofers. There are no proof for iem, earbuds or headphone though.

    Due to constant movement, parts of driver goes into molecular exhaustion.


    But new age drivers are very advanced compared to old age lowthers like driver.


    Actually when we say pink noise, it was actually a burn method for everyone and you cannot expect a result with it that's why I wrote a custom way of burning(which still cannot be 100% accurate technically).

    Burn in is flattening the peaks of driver in frequency impedance graphs to ideal level.


    First get to know about the frequency which is having higher impedance. Sort of peak, burn that frequency and parameters will start moving towards ideal parameters.

    First 24hrs are quickest and we reach to ideal value faster.

    But my suggestion is maximum 50hrs of burn. Not more than that as it is wasting of time. If thing sounds same after 50hrs then there is no use of burning it.

    (This process has to be continuous and at a volume where clipping doesn't exist, sort of safe limit volume for independent frequency)

    Pink noise etc takes huge time as all freq are playing in a noise format so we have to keep low volume for driver safety
     
  13. dhruvmeena96
    [​IMG]

    [​IMG]


    See burn in effects the response.


    I don't think it is a myth anymore.

    Just that extremely advanced diaphgram or rigid one takes forever to burn...
     
  14. bfreedma

    Any background info on how that test was done, particularly whether the IEM was kept inserted in the measuring device the entire time?

    Also just noticed that the tests were done at very different volume levels - the first test appears to be done with a signal about 40db louder than the second. I'm skeptical that the controls were in place here to support the assertion that this single example is "proof of burn in".
     
  15. bigshot
    Do you think that when they burned in, the overall level dropped 40dB?

    I don't.
     
    Beagle likes this.
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