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<blockquote data-quote="Ivan Beaver" data-source="post: 137959" data-attributes="member: 30">Re: dB calculationsI would argue that a large majority of manufacturers do NOT provide sensitivity vs freq plots.&nbsp; Some provide freq-but there is no reference to sensitivity-the vertical scale is just in dB from a 0 line.&nbsp; And what IS that 0 line? The rated sensitivity?&nbsp; Something else?And I guess my biggest &quot;gripe&quot; is that when a manufacturer shows a sensitivity and freq response plot-yet the &quot;simple numbers&quot; are very wrong when compared to that same graph. I have seen them 15-20dB OFF (especially in low end of the freq response simple number).&nbsp; That is the whole subject of a paper I am working on about how to read and understand spec sheets and what &quot;games&quot; are often played.&nbsp; And the &quot;major players&quot; are not immune to doing this <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f641.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":(" title="Frown&nbsp; &nbsp; :("&nbsp; data-smilie="3"data-shortname=":(" />So a person who does not have a graph (or understand how to read it) takes the &quot;simple numbers&quot; and &quot;compares&quot; it to products that have legit specs and makes a very uninformed decision.&nbsp; But that is EXACTLY what those manufacturers are counting on-and it works (for getting sales).&nbsp; But does not help the consumer.</blockquote>

[QUOTE="Ivan Beaver, post: 137959, member: 30"] Re: dB calculations I would argue that a large majority of manufacturers do NOT provide sensitivity vs freq plots. Some provide freq-but there is no reference to sensitivity-the vertical scale is just in dB from a 0 line. And what IS that 0 line? The rated sensitivity? Something else? And I guess my biggest "gripe" is that when a manufacturer shows a sensitivity and freq response plot-yet the "simple numbers" are very wrong when compared to that same graph. I have seen them 15-20dB OFF (especially in low end of the freq response simple number). That is the whole subject of a paper I am working on about how to read and understand spec sheets and what "games" are often played. And the "major players" are not immune to doing this :( So a person who does not have a graph (or understand how to read it) takes the "simple numbers" and "compares" it to products that have legit specs and makes a very uninformed decision. But that is EXACTLY what those manufacturers are counting on-and it works (for getting sales). But does not help the consumer. [/QUOTE]

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