
Which one is better..?
takeone4345 wrote:
看了一下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.


takeone4345 wrote:
thxman.tw wrote:
1.就理論原理與實務技術,運用 Outdoor ground plane measurement 之法,1m測距、2m測距、3m測距 何有錯哉?

thxman.tw wrote:
2.就理論原理與實務技術,運用 Outdoor ground plane measurement 之法的 ANSI/CEA-2010 其對測距之原文為 『Measurement distance shall be at least 1 m』,安有錯乎?

thxman.tw wrote:
3.就理論原理與實務技術,運用 Outdoor ground plane measurement 之法,於http://www.myav.com.tw/bbs/showthread.php?s=&threadid=20445568&perpage=12&pagenumber=35 串中,為何鄙人提出不宜採1米測距去測量與比較?

thxman.tw wrote:
4.就理論原理與實務技術,運用 Outdoor ground plane measurement 之法,於 頻響之惑--秦朝 BQ3115D(https://www.mobile01.com/topicdetail.php?f=348&t=5430737)中,秦朝 BQ3115D 的創建者違反了哪些理論原理與實務技術的錯誤?

thxman.tw wrote:
PS.
倘對理論原理與實務技術皆所未明,東拼西湊、斷章取義、亂截亂言一通,不僅站不上巨人之肩,惟係巨人腳下之塵土,就識者明者以觀,此自大之語夜郎爾!此滑稽之為丑角爾!


takeone4345 wrote:
thxman.tw wrote:
1.對上問之回答竟如此,是自曝爾對 Outdoor ground plane measurement 的理論原理與實務技術不明,僅會亂截、亂貼一通。
thxman.tw wrote:
1.建議takeone4345兄 把Outdoor ground plane measurement 理論原理理明。
2.建議takeone4345兄 把Outdoor ground plane measurement 實務技術操作熟明。
3.建議takeone4345兄 把ANS/CEA-2010的歷史輪廓理明。
4.建議takeone4345兄 把ANS/CEA-2010的規範原文讀明、理明,非僅就網路網文亂拼亂湊亂言。

thxman.tw wrote:
2.對第4問之誤不明,那更何能侃論 Outdoor ground plane measurement 的理論原理與實務技術。

thxman.tw wrote:
3.鄙上之PS所闡係人世道之理,無特定人,更無人身攻擊,自對號而坐者,心虛底不足!!!
thxman.tw wrote:
4.若 takeone4345先生 對 Outdoor ground plane measurement 之法有一定之認知,請就駕 頻響之惑--秦朝 BQ3115D(https://www.mobile01.com/topicdetail.php?f=348&t=5430737),依理論原理與實務技術道明其誤,以宴饗眾燒友、網友,功德無量。

thxman.tw wrote:
5.建議takeone4345兄 許多事物若不理明而胡言亂語,恕在下直言,不僅自誤誤人之虞,恐自損陰德。

takeone4345 wrote:
一個理論的價值..在於理論本身不能自相矛盾..
