Frequency response +4 -8 dB 27 - 20,000 Hz Sensitivity 5 W

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Frequency response +4 -8 dB 27 - 20,000 Hz
Sensitivity 5 W
灵敏度怎么写得5W，难道可以折合成DB吗

xiao9118

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以前的古董箱灵密度怎么标明W啦

澳門客

　古董舊箱都是用db標示效率，但是並非1m/1w，是EIA制，即EIA SENSITIVITY RATING  XXdb，EIA制的意思是在1mw/30 feet（英尺）測量得到的响度db
　如果把EIA制換算現代1m/1w就是加上49db，見外國有討論區，看
　問：
　Anybody remember how to covert the old EIA loudspeaker sensitivity rating to SPL at 1W at 1M? For example, what would an old rating of 45 dB be in today's terms?
　Make that RETMA sensitivity rating. How to convert from the old RETMA rating to the current kind?
　各位仁兄，有無人記得如何把舊EIA揚聲器的靈敏度等級轉為SPL在1W在1M？例如，將舊45db在今天的SPL是多少？
　作出這樣的RETMA靈敏度等級。如何從舊RETMA等級轉換為當前樣？
　答：
　1mW at 30ft to 1W at 1M
　Add 30dB for the 1W
　Add 19dB for the 1M
　45dB + 30dB + 19dB = 94dB

澳門客

所以我上次都答過，樓主你是否看漏了，Sensitivity 5 W或之後有寫多數db，或者你拍張照片上來看看

xiao9118

参数：
Beovox M70 Passive Loudspeakers Product Specifications
Type: 6304 (to May 1978)
Continuous load 70 W
Music load 120 W
Impedance: 4 - 8 ohms
Frequency response: +4 -8 dB 27 - 20,000Hz
Sensitivity: 5 W
Gross volume: 39.1 litre

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就这么写得