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"Прогрев" АС - правда или вымысел?

Chesky Records

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chesky

06-10-2005 20:46:43

Возьмем быка за яйца:
http://groups.google.com/group/rec.audio.high-end/msg/7d26f5cc57ffd849?q=author:DPierce%40world.std.com+and+speaker+break+in&hl=en&lr=&ie=UTF-8&rnum=1
Товарисч (Richard Pierce) измерил несколько тысяч (!) динамиков и делится своими знаниями (!) по сабжевому вопросу.

Chesky Records

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chesky

06-10-2005 20:52:37

Идем дальше:
http://hometheaterhifi.com/forum/archive/index.php/t-1555.html

Цитата

David Clark, an AES Fellow presented "Precision Measurement of Loudspeaker Parameters", which was published in the March, 1997. Abstracting from that paper is the following quote:
"5.1 Break-In"

"A break-in process is recommended. Drive-unit storage may cause the diaphragm suspension to drift away from its normal or in-use position. Break-in, with the drive-unit axis in the in-use orientation (usually horizontal), restores the normal diaphragm position. The recommended procedure pneumatically stretches the suspension to one excursion extreme, then the other and continues to alternate, decreasing the excursion each time until x is at zero. This process can be completed in less than 1 min."

Mr. Clark also indicated that drivers which had been stored face-up or face-down sometime need 1 minute of pink noise to restore the original center position. This could also be accomplished by a few strokes of the suspension which many manufacturers do routinely when the speaker is at the end of the assembly line. This suggests that most speakers, are in fact broken in when you get them.

Вот тут лежит упоминаемая выше статья D.Clark'a:
http://www.tkhifi.com/datablade/dlcpaper.pdf

[small]Отредактировано: 07-10-2005, 08:10[/small]

Chesky Records

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chesky

06-10-2005 20:58:34

Еще из этого же источника:
http://hometheaterhifi.com/forum/archive/index.php/t-1555.html

Цитата

Further work has been performed by Tom Nousaine who has measured speaker parameters pre and post break-in as well as having conducted controlled listening tests. He has found that the Fs of the speaker falls however that is offset by a rise in Vas. Both these parameters were related to the changes in compliance that occurred. During the playing or excercising if you will of the speaker both the spider and the surround become more compliant (they move easier if you will). Additional measurements on samples of identical drivers indicated that the changes that occured pre and post breakin on a single driver were smaller than the variations within a particular lot of drivers. Since there are manufacturing tolerances for drivers this indicates that whatever changes are that occur are smaller than those of manufacturing tolerances. This further indicates that the net effect of speaker breakin is nada, nothing, zilch, forget about it, etc.

In one experiment, Nousaine used a driver that was said to need 48 hours of break-in. Placing the driver in a 1.5 cubic foot box, he found the system resonance to be 53 Hz before break in. After 48 hours the resonance was 49 Hz. After a few minutes rest, the resonance had gone back to 51 Hz. The following morning it was back to 53 Hz. This indicates that whatever small changes that occur in a driver's characteristics during playback comeback to their original state after rest.

Chesky Records Пользователь Сообщений: 332	chesky #4 06-10-2005 21:05:00 А тут можно посмотреть графики, цифры "до" и "после" прогрева: http://www.audioholics.com/techtips/audioprinciples/loudspeakers/SpeakerBreakIn.php http://www.audioholics.com/techtips/audioprinciples/loudspeakers/SpeakerBreakIn2.php

Chesky Records

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chesky

06-10-2005 21:12:04

Статья Tom Nousaine "Audio's Top Urban Legend":
http://bruce.coppola.name/audio/BurnInLegend.pdf

Цитата
So do the speakers break in once we get the home? Hell, no. And we should be thankful for this. I'd worry about the manufacturer who'd let a product leave his factory before he'd verified its final performance. If breaking in is truly needed, it should be done at the factory.

http://forums.audioholics.com/forums/archive/index.php/t-539.html

Цитата
I had many entertaining discussions with Dr. Floyd Toole on speaker break in and he also concurred it was pretty much a baseless myth which dealt more with listener breakin than speaker break in.

[small]Отредактировано: 07-10-2005, 11:27[/small]

ТорСион ***** Пользователь Сообщений: 10214	ni-kola #6 06-10-2005 21:33:11 а в двух словах по русски??)))

Сергей Пользователь Сообщений: 9850	hochmann #7 06-10-2005 21:38:44 на 4 а вот коменты почему все-таки люди слышат разницу )) http://www.audioholics.com/news/editorials/loudspeakerbreakinmechanical.php

Сергей Пользователь Сообщений: 9850	hochmann #8 06-10-2005 21:42:44 на 6 что пока я прочитал (п.4) - он нихрена не намерял... нашел 5% разницу в параметрах динамиков читаю дальше [small]Отредактировано: 06-10-2005, 21:45[/small]

ТорСион ***** Пользователь Сообщений: 10214	ni-kola #9 06-10-2005 21:45:34 эт я тожа прочел)).. я уже и конец посмотрел--в Байкал таки нассали..но химсостав -- для ПРИГОДНОСТИ к употреблению воды оттуда-НЕ изменился)))

Chesky Records

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chesky

#10

06-10-2005 21:47:20

7
А где ты там нашел

Цитата
коменты почему все-таки люди слышат разницу ))