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- 03.08.2006
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I "A burning issue" viser Keith Howard til en USHER test CD: Ultimate Stereo Hearing and Equipment Refresher. I avsnittet om Burn-In står dette:
Burn-in
It is by no means universally accepted that all hi-fi benefits from being 'burned in'. In the case of products such as cables and CD players it sounds at best questionable, and although it can be shown that many amplifiers do in fact stabilise over the first few seconds, or perhaps minutes, of operation as they reach thermal equilibrium it's still not obvious how tens or hundreds of hours of use could make a substantial difference to their performance, as many claim. In the absence of any technical evidence for this (if you have some, please let us know!) it is not possible to discount the possibility that what's really getting 'burned in' is the listener's ear, as he/she becomes accustomed to the sound of the new component and comes both to regard it as 'normal' and to extract the most information from it. Or of course there could be a combination of effects going on.
However, loudspeaker burning in is a much more prosaic matter. The suspension of the great majority of dynamic loudspeaker drivers is relatively unsophisticated and although it has been developed to the point where it works well it does not have completely stable characteristics over time. Generally, it stiffens up over the years, which makes the bass resonance of the driver rise. This has all kinds of sonic effects, including increased distortion and frequency response anomalies. USHER track 25, 'loudspeaker shakedown', simply gives the bass driver a good stretch to exercise the suspension and relieve some of its stiffness. This is completely irrelevant with full-range panel drivers such as electrostatics and may have little or no effect with some conventional (dynamic) drivers, but in general it can be surprisingly useful with many speakers. A few minutes (just put the track on repeat - we didn't want to waste space on the disc by devoting ages to something so simple) every six months is a useful general workout. Do pay attention to the preceding track for level setting as overdoing things is not a good idea. However, if you listen out for sounds of distress it's unlikely you'll come anywhere near damage levels. You can just as easily damage things by playing music too loud and we won't be held liable!
Burn-in
It is by no means universally accepted that all hi-fi benefits from being 'burned in'. In the case of products such as cables and CD players it sounds at best questionable, and although it can be shown that many amplifiers do in fact stabilise over the first few seconds, or perhaps minutes, of operation as they reach thermal equilibrium it's still not obvious how tens or hundreds of hours of use could make a substantial difference to their performance, as many claim. In the absence of any technical evidence for this (if you have some, please let us know!) it is not possible to discount the possibility that what's really getting 'burned in' is the listener's ear, as he/she becomes accustomed to the sound of the new component and comes both to regard it as 'normal' and to extract the most information from it. Or of course there could be a combination of effects going on.
However, loudspeaker burning in is a much more prosaic matter. The suspension of the great majority of dynamic loudspeaker drivers is relatively unsophisticated and although it has been developed to the point where it works well it does not have completely stable characteristics over time. Generally, it stiffens up over the years, which makes the bass resonance of the driver rise. This has all kinds of sonic effects, including increased distortion and frequency response anomalies. USHER track 25, 'loudspeaker shakedown', simply gives the bass driver a good stretch to exercise the suspension and relieve some of its stiffness. This is completely irrelevant with full-range panel drivers such as electrostatics and may have little or no effect with some conventional (dynamic) drivers, but in general it can be surprisingly useful with many speakers. A few minutes (just put the track on repeat - we didn't want to waste space on the disc by devoting ages to something so simple) every six months is a useful general workout. Do pay attention to the preceding track for level setting as overdoing things is not a good idea. However, if you listen out for sounds of distress it's unlikely you'll come anywhere near damage levels. You can just as easily damage things by playing music too loud and we won't be held liable!
