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<blockquote data-quote="Ivan Beaver" data-source="post: 140799" data-attributes="member: 30">Re: Infocomm???The +/- spec on a sub does not really tell much in the terms of &quot;usability&quot;We never know where the low pass filter will be set is a particular situation, and the peaks can always be eqed down.It is simpler just to state the -dB pints, THAT is what is important.The reason we ONLY use 2.83V is that allows for easy comparison between boxes.&nbsp; The problem with &quot;switching voltages&quot; is that what is the voltage REFERENCED TO?Many refer to 2.83V=1 watt @ 8 ohms.&nbsp; HOWEVER-You DO NOT APPLY WATTS to a loudspeaker-ONLY voltage.&nbsp; The watts are the resultant of the applied voltage and the impedance.&nbsp; Since the impedance varies at different freq, the &quot;wattage&quot; will also.&nbsp; So the term &quot;watts&quot; is COMPLETELY WRONG, and then if you are trying to adjust voltages to make the &quot;Watts&quot; work out, then that can result in errors as well.In MANY cases the ACTUAL impedance is NOT the &quot;nominal&quot; impedance.&nbsp; ESPECIALLY when you start putting drivers on horns-as most of ours are.&nbsp; The ACTUAL impedance is often higher.&nbsp; So what voltage should be used them?&nbsp; The rated?&nbsp; the minmum-some sort of &quot;average&quot; (over what freq range?)?To keep it simple-we use only 2.83V.&nbsp; And by supplying the freq and impedance curves the user can easily figure out what THEY fell the cabinet is capable of.Of course we do not measure the subs with 2.83V-that is what they are referenced back to.We use 28.3 and measure at a distance of 10M.&nbsp; 28.3V is a 20dB gain, and 10M is a 20dB loss-so they &quot;equal&quot;.As far as I am concerned, the IMPORTANT thing about specs is to give the user the information they need to figure out how a particular product will perform.Many manufacturers rely on confusion and deception on what the numbers mean and where they come from.At least we supply the measurement condition and the measured responses, so you can make whatever adjustments you need to see about the suitability for a particular usage.Without this data-you can only &quot;hope&quot; that the product will perform as stated-many do not follow the &quot;simple numbers&quot;-EVEN when both are supplied.</blockquote>

[QUOTE="Ivan Beaver, post: 140799, member: 30"] Re: Infocomm??? The +/- spec on a sub does not really tell much in the terms of "usability" We never know where the low pass filter will be set is a particular situation, and the peaks can always be eqed down. It is simpler just to state the -dB pints, THAT is what is important. The reason we ONLY use 2.83V is that allows for easy comparison between boxes. The problem with "switching voltages" is that what is the voltage REFERENCED TO? Many refer to 2.83V=1 watt @ 8 ohms. HOWEVER-You DO NOT APPLY WATTS to a loudspeaker-ONLY voltage. The watts are the resultant of the applied voltage and the impedance. Since the impedance varies at different freq, the "wattage" will also. So the term "watts" is COMPLETELY WRONG, and then if you are trying to adjust voltages to make the "Watts" work out, then that can result in errors as well. In MANY cases the ACTUAL impedance is NOT the "nominal" impedance. ESPECIALLY when you start putting drivers on horns-as most of ours are. The ACTUAL impedance is often higher. So what voltage should be used them? The rated? the minmum-some sort of "average" (over what freq range?)? To keep it simple-we use only 2.83V. And by supplying the freq and impedance curves the user can easily figure out what THEY fell the cabinet is capable of. Of course we do not measure the subs with 2.83V-that is what they are referenced back to. We use 28.3 and measure at a distance of 10M. 28.3V is a 20dB gain, and 10M is a 20dB loss-so they "equal". As far as I am concerned, the IMPORTANT thing about specs is to give the user the information they need to figure out how a particular product will perform. Many manufacturers rely on confusion and deception on what the numbers mean and where they come from. At least we supply the measurement condition and the measured responses, so you can make whatever adjustments you need to see about the suitability for a particular usage. Without this data-you can only "hope" that the product will perform as stated-many do not follow the "simple numbers"-EVEN when both are supplied. [/QUOTE]

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