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In Reply to: Dumbest test ever! (10 seconds break in ... compared with 20 hours break-in!) posted by Richard BassNut Greene on April 13, 2007 at 07:31:21:
including the results from other designers. There are other published findings that are totally consistent. Or maybe you just are happier being a troll, regardless of what others who are far more knowledgeable and experienced than you demonstrate?
Follow Ups:
I can't find anything in the report that equates the mechanical measurements with actual changes in sound. My apologies if I've overlooked this. The numbers presented mean very little to me in the context of this discussion.The report also mentions that the greatest contributor to speaker burn in is from the electrical burn in, the majority of which is from the burn in of capacitors.
So given this report, my question would be how long does it take a capacitor to burn in?
and the xovers are designed around optimal driver parameters. If those params are different because the driver is new, the xovers won't work as designed, which will certainly affect the sound.
I'll try to explain what I think happens, and how it affects the sound. I'll limit my remarks to the measured driver params listed, not the electronic components that Danny mentions, as those changes are harder to measure.
The fs of a driver is related to its lower frequency limit. If a driver is driven below its fs, distortion rises very rapidly with declining frequency. A higher fs in a new also means that there will be a reduction in the LF output of the driver, and at a given frequency below the fs, there will be higher distortion.
The xovers are designed to deliver energy in a defined and fixed band, with usually a fairly shallow rollof at the ends of the band. With a new driver, with a higher fs the lower part of the xover band will be feeding more energy below the fs of the new driver that xover section is feeding. That means higher distortion at the bottom of the driver's range. As the driver fs drops with use, more and more of the xover band will cover the (expanding) driver's sweet spot.If it is a woofer, this will change the balance of the whole system, making it subjectively brighter overall, with constricted bass. The bass will also exhibit higher distortion, as more power is going to it below its (temporary) higher fs.
For mids and tweeters with high pass filters, the effects are the same, but of course they manifest themselves at the low end of the mid or tweeter range, as aberrations in the lower midrange and low to mid treble.Xover design theory hasn't changed substantially in decades. Xovers are designed around driver params so that each driver is operating in its sweet spot. If the driver params shift, that driver sweet spot will shift as well.
There is no magic or fuzzy thinking at work here, just the application of loudspeaker engineering basics.
I can dig all of that, but it still tells me nothing about how truly audible the changes are in a normal listening environment.
nt
To that end, for the sake of this discussion, the report is rather meaningless.
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