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<blockquote data-quote="Ivan Beaver" data-source="post: 137868" data-attributes="member: 30">Re: dB calculationsThe coupling effect of multiple speakers (and reflections off of walls/floor etc) is dependent on both the distance and the freq.The lower the freq the further away devices can be and still couple.&nbsp; As you go up in freq the distances get very small very quick.When talking about combfiltering (contrary to popular opinion) it is NOT the distance the devices are away from each other, but RATHER the difference in signal arrival from each of the devices to a particular location that matters.&nbsp; When you change locations, you have changed the difference in arrival times, therefore changing the combfiltering freq.&nbsp; Which (again contrary to popular opinion) are both ADDITIONS AND Subtractions.&nbsp; Of course the subtractions FAR outweigh the dB difference of the additions.&nbsp; The maximum addition will be 3dB will the maximum subtraction could be infinitely deep.As usual with MOST audio questions, the FIRST question should be &quot;At what freq?&quot;.&nbsp; Because all sorts of different things happen at different freq.The &quot;rules&quot; for 30Hz are completely different (in terms of additional speakers-boundaries etc) than at 2Khz.</blockquote>

[QUOTE="Ivan Beaver, post: 137868, member: 30"] Re: dB calculations The coupling effect of multiple speakers (and reflections off of walls/floor etc) is dependent on both the distance and the freq. The lower the freq the further away devices can be and still couple. As you go up in freq the distances get very small very quick. When talking about combfiltering (contrary to popular opinion) it is NOT the distance the devices are away from each other, but RATHER the difference in signal arrival from each of the devices to a particular location that matters. When you change locations, you have changed the difference in arrival times, therefore changing the combfiltering freq. Which (again contrary to popular opinion) are both ADDITIONS AND Subtractions. Of course the subtractions FAR outweigh the dB difference of the additions. The maximum addition will be 3dB will the maximum subtraction could be infinitely deep. As usual with MOST audio questions, the FIRST question should be "At what freq?". Because all sorts of different things happen at different freq. The "rules" for 30Hz are completely different (in terms of additional speakers-boundaries etc) than at 2Khz. [/QUOTE]

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