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<blockquote data-quote="Ivan Beaver" data-source="post: 82559" data-attributes="member: 30">Re: Loudspeaker SensitivityI am not aware of ANY manufacturer that uses the 1 watt method.NOW BEFORE anybody gets excited-many STATE that it is based on 1 watt.&nbsp; But it is NOT.&nbsp; It is based on the voltage at the rated impedance (2.83V for 8 ohm 2 volt for 4 ohm etc) that it was tested at.If they REALLY put 1 watt into the loudspeaker-then the applied voltage would be all over the place (due to the impedance not being constant)-so the freq response would be even more ragged than it is now.And besides we DON&#039;T use POWER amplifiers to drive speakers.&nbsp; YES they are called that-but in reality they are just VOLTAGE amplifiers.&nbsp; They take a given input voltage and apply a certain amount of gain to it.&nbsp; The power is the result of the applied voltage into the loudspeaker load.&nbsp; As long as you stay below the maximum output-then the voltage coming out of the amp will be the same-no matter what impedance loudspeaker is hooked to it.If it were a true &quot;power amp&quot;, then the voltage would change with different impedance loads.Yes I may be getting &quot;picky&quot;, but it is important to realize the differences.For what it is worth-Danley uses the applied voltage (2.83V) for sensitivity.&nbsp; It doesn&#039;t matter the impedance.&nbsp; Because that is what you are applying-voltage NOT power.And just to throw a little more fuel on the fire.&nbsp; The rated impedance is not always the actual impedance-or an average.For example the Danley TH115.&nbsp; It is rated at 4 ohms-but the ACTUAL impedance that it should be &quot;rated&quot; at is 5 ohms.HOWEVER it is amazing how many people are confused by anything other than 2-4-8-16 ohms.&nbsp; So if we calculated the voltage to be applied for a 4 ohm load-and then applied it to a 5 ohms load-the measured output would be lower than if it was calculated for 5 ohms.Origionally the Sh50 was rated at 6 ohms-because that was what it should be rated at.&nbsp; I was getting tons of calls asking what kind of amp to use-because people could not find a spec for a 6 ohm amp.So we changed the rated impedance to 4 ohms and the phone calls stopped.Many people simply don&#039;t understand the voltage-power-impedance relationships.&nbsp; And that is part of audio 101.&nbsp; As is being able to read a basic spec sheet and understand what it means.I am not talking about Heyser spirals here-but a basic response curve and what it really means.</blockquote>

[QUOTE="Ivan Beaver, post: 82559, member: 30"] Re: Loudspeaker Sensitivity I am not aware of ANY manufacturer that uses the 1 watt method. NOW BEFORE anybody gets excited-many STATE that it is based on 1 watt. But it is NOT. It is based on the voltage at the rated impedance (2.83V for 8 ohm 2 volt for 4 ohm etc) that it was tested at. If they REALLY put 1 watt into the loudspeaker-then the applied voltage would be all over the place (due to the impedance not being constant)-so the freq response would be even more ragged than it is now. And besides we DON'T use POWER amplifiers to drive speakers. YES they are called that-but in reality they are just VOLTAGE amplifiers. They take a given input voltage and apply a certain amount of gain to it. The power is the result of the applied voltage into the loudspeaker load. As long as you stay below the maximum output-then the voltage coming out of the amp will be the same-no matter what impedance loudspeaker is hooked to it. If it were a true "power amp", then the voltage would change with different impedance loads. Yes I may be getting "picky", but it is important to realize the differences. For what it is worth-Danley uses the applied voltage (2.83V) for sensitivity. It doesn't matter the impedance. Because that is what you are applying-voltage NOT power. And just to throw a little more fuel on the fire. The rated impedance is not always the actual impedance-or an average. For example the Danley TH115. It is rated at 4 ohms-but the ACTUAL impedance that it should be "rated" at is 5 ohms. HOWEVER it is amazing how many people are confused by anything other than 2-4-8-16 ohms. So if we calculated the voltage to be applied for a 4 ohm load-and then applied it to a 5 ohms load-the measured output would be lower than if it was calculated for 5 ohms. Origionally the Sh50 was rated at 6 ohms-because that was what it should be rated at. I was getting tons of calls asking what kind of amp to use-because people could not find a spec for a 6 ohm amp. So we changed the rated impedance to 4 ohms and the phone calls stopped. Many people simply don't understand the voltage-power-impedance relationships. And that is part of audio 101. As is being able to read a basic spec sheet and understand what it means. I am not talking about Heyser spirals here-but a basic response curve and what it really means. [/QUOTE]

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