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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Re: "most of it occurs in the first 24-48 hours of playing time" = a gross exaggeration not supported by data posted by asull on November 10, 2006 at 09:18:04:
The real question is if driver parameter changes are audible after initial use.Initial use is usually at the speaker factory during QC testing.
No one tests break-in audibility with a controlled listening test ... but brand new cone drivers often have weak bass. And we know T/S parameters will permanently change 5-10% after some break-in time.
But we also know T/S parameters will temporarily change 5-10% every day we use speakers during the first 5-10 minutes of use when the voice coils are heated up.
It's strange that audiophiles don't report how bad their speakers sound during the first 5-10 minutes of use every day ...
... yet the same people claim they easily hear 5-10% driver parameter changes over 20 hours, or even over 100 hours, when their speakers were new.
Why is it that 5-10% driver parameter changes over 100 hours are claimed to be audible ... while identical percentage driver parameter changes over 5-10 minutes seem inaudible?
Some audiophile fantasy involved here?
The second question is how long the permanent driver changes are audible.
The engineer at the web site you referenced seems to have an agenda:
-- He wants to convince people that audible break-ineffects happen over dozens of hours of use.So he does a 10 second test ... and then imediately skips to a 20 hour test!!!
The right answer is that one or two hours of heavy use are required for almost all the measurable permanent T/S changes to a typical driver (whether these changes are audible is still in question).
But there is no break-in test done for any time period between 10 seconds and 20 hours -- so this methodology allows the engineer to support his pre-existing conclusion.
The very tiny T/S parameter changes after 20 hours may be within the tolerances of the measuring instruments. They are not going to be audible.
The engineer also makes some measurements when voice coils are cool and others when voice coils are hot. These measurements combine driver break-in effects with driver warm-up effects = a poor methodology.
I'm not sure how many hours are required for voice coils to cool off to room temperature for measurements, so I can't comment on the time he allows the voice coils to cool off.
If an engineer has an agenda, it's easy to select a test methodology to support his agenda.
That's exactly what happened here.
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,
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Richard BassNut Greene
My Stereo is MUCH BETTER than Your Stereo
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Follow Ups
- Dishonest engineer with an agenda (does a 10 second break-in test then jumps all the way to a 20 hour break-in test !) - Richard BassNut Greene 10:01:36 11/10/06 (4)
- Re: Dishonest engineer with an agenda (does a 10 second break-in test then jumps all the way to a 20 hour break-in test - asull 10:52:21 11/10/06 (3)
- The term "Dishonest" is entirely appropriate - Soundmind 18:12:15 11/10/06 (2)
- Re: The term "Dishonest" is entirely appropriate - asull 19:16:27 11/10/06 (1)
- a 10 second break-in test followed by a second measurement after 20 hours break in ... is either dishonest, or stupid - Richard BassNut Greene 10:28:11 11/11/06 (0)
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