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發表於 2018-1-7 00:52:35
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本帖最後由 takeone 於 2018-1-7 00:54 編輯
看了CEA-2010主要推廣者brent butterworth的頁面,發現很詭異的事...
http://www.brentbutterworth.com/cea-2010-measurement-manual.html
節錄一段:
MEASUREMENT DISTANCE
The distance from the microphone to the subwoofer under test has been the subject of some controversy. The original CEA-2010 document specified a distance of 1 meter or greater, but most of the people doing subwoofer output measurements were measuring at 2 meters, to incorporate a better blend of the contributions of all radiating devices (drivers, ports, passive radiators). The new CEA-2010A standard was changed to accommodate this concern, but the new document specifies a minimum test distance of 3 meters. In my opinion, 3 meters seems unnecessarily far because it is unlikely to significantly improve the incorporation of all radiating elements, while it reduces the signal-to-noise ratio of the measurement. I don’t know of anyone doing CEA-2010 who is using 3 meters as the measuring distance.
誇張...
真是受不了,要不然我根本懶得去了解
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