輸出W數點計.
小第不材, 好多野都比返老師.現有以下問題, 請各位幫忙解答.
以 LX-72 為例, 我見佢個spec 寫輸出為 180W x 7ch (6ohms),
甘我想問係當係 8ohms 時, 7ch, 每 ch 輸出應係幾多呢, 唔知係點計呢.
因我見Y記會用 8ohms 顯示, 如 3900, 會係 185W x 7ch (8ohms), 共1295W
但P記就用 6ohms 顯示, 所以唔知點去比較呢.
有錯請指正.
先多謝. may be there should be mesurement for it , but i think u should focus on your ear because each company have their own measure way , the testing equimentwas different as well , how can u compare base on different test. 佢話 180 W x7, 其實取巧既, AV amp 多數計 PMPO (peak music power output 咁上下).. 即係突然一短好短時間可以出到幾大 power, 呢個 power 唔係連續既, 要真係連續出就要睇 RMS Power...e+ d 貴價話出到二百幾三百火 per channel, 11 channel 加埋成三千幾火, 如果真係咁堅, 13A fues 都會燒埋....
加上, 唔同牌子 PMPO 計法唔同, 所以唔同牌子 spec 比又係無意思....
答番你既問題先, 純粹物理上 RMS 或 DC 計法:
P=V*V/R, P=180, R= 6... 咁 V就係 32volt 左右... 即係你 6 ohm load 下俾出 32 V 就會有 180W... 咁 8 ohm 又代番入去 P=32*32/8... P= 135W....
數就係咁計, 但我可以話計來其實無乜特別意思.... 佢話 180 W x7, 其實取巧既, AV amp 多數計 PMPO (peak music power output 咁上下).. 即係突然一短好短時間可以出到幾大 power, 呢個 power 唔係連續既, 要真係連續出就要睇 RMS Power...e+ d 貴價話出到二百幾三 ...
kennethtcp 發表於 2009-10-8 21:56 http://www.post76.com/discuss/images/common/back.gif
thank you.....{:6_182:}
原來係冇嘜意思既.
thank you.....{:6_182:}
原來係冇嘜意思既.
ricoy288 發表於 2009-10-9 09:34 http://www.post76.com/discuss/images/common/back.gif
同系列比咪有囉, 唔同牌子, 唔同系列比黎都無乜特別意思, 你睇 d integrated amp 100W x2 已經係高檔野, AV amp 寫 150Wx7 係入門級咋...
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