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<blockquote data-quote="Johnny Drama" data-source="post: 2129746" data-attributes="member: 554719">My view on the matter...(Someone correct me if I am wrong)Efficiency is the measure of 1w/1m not 2.83v or whatever(that would be sensitivity IIRC). Now with that laid down, efficiency will also change with the note measured at.If Sub A has an 89db efficiency with 1w/1m at 50hzSub B has an 87db efficiency with 1w/1m at 40hzIf you take the IB situation as talked about in this thread. At 50hz sub A &quot;should&quot; be louder. At 40hz however, sub B &quot;may&quot; be louder depending on the actual efficiency of A at that note. Therefor you can not say that A will &quot;always&quot; be louder.During a competition or even on music you wont be able to say that sub A will always be louder at every level or note. If your car and/or box peaks where sub B has the highest efficiency over sub A, again you can not say that A will &quot;Always&quot; be louder.Finally, As with anything in the audio world. Actual power, efficiency, and all other parameters of any equipment will change in car, in house, in the box, power, and with any change to the environment such as, but not limited to heat or voltage.</blockquote>

[QUOTE="Johnny Drama, post: 2129746, member: 554719"] My view on the matter...(Someone correct me if I am wrong) Efficiency is the measure of 1w/1m not 2.83v or whatever(that would be sensitivity IIRC). Now with that laid down, efficiency will also change with the note measured at. If Sub A has an 89db efficiency with 1w/1m at 50hz Sub B has an 87db efficiency with 1w/1m at 40hz If you take the IB situation as talked about in this thread. At 50hz sub A "should" be louder. At 40hz however, sub B "may" be louder depending on the actual efficiency of A at that note. Therefor you can not say that A will "always" be louder. During a competition or even on music you wont be able to say that sub A will always be louder at every level or note. If your car and/or box peaks where sub B has the highest efficiency over sub A, again you can not say that A will "Always" be louder. Finally, As with anything in the audio world. Actual power, efficiency, and all other parameters of any equipment will change in car, in house, in the box, power, and with any change to the environment such as, but not limited to heat or voltage. [/QUOTE]

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