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Why Do TEF Systems read 3-5 dB high ?
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<blockquote data-quote="Phil Lewandowski" data-source="post: 24855" data-attributes="member: 44"><p>Re: Why Do TEF Systems read 3-5 dB high ?</p><p></p><p></p><p> </p><p>Thanks Silas, yeah right above is the easy one, but sense the audience with flown subs is usually at a much lower angle than 90 degrees to the subs in relation to the ground, I have always been wondering how much output is really lost by flown subs, since I thought it wouldn't be much at all, but curious about putting some actual numbers to it.</p><p></p><p>Sense it seems that "complete cancellation" right above is already down is around 45hz, so then that would seem that as the angle gets lowered to say 45 degrees in relation to the ears, sub, and ground, it seems like the frequency that would be affected would go up, as the distance between the floor bounce and ears gets shorter?</p><p></p><p>{edit} So with a quick sketch, it seeming like it is reasonable to think that in the real world there is going to be a whole bunch of floor bounces reaching the ears at different times, meaning you are creating a bunch of different triangles to figure out what the difference in time arrival is?</p><p></p><p>Or will there only be a small area of distance in front of the listener that there bounce would have the correct angle to bounce to the listener's ears? (This is all assuming a pretty flat and hard surface in front of the listener, no raked seating, balcony, etc.)</p><p></p><p>{edit 2} Doing a little calculation, it seems like my last assumption could be wrong, sense, if the listener and flown subs are still; you can move the point along the floor in front of the listener and the total distance traveled of the reflected wave to the listener's ears seems to add up to the same, while the direct sound of course stays the same.</p><p></p><p></p><p>Thanks,</p><p>Phil</p></blockquote><p></p>
[QUOTE="Phil Lewandowski, post: 24855, member: 44"] Re: Why Do TEF Systems read 3-5 dB high ? Thanks Silas, yeah right above is the easy one, but sense the audience with flown subs is usually at a much lower angle than 90 degrees to the subs in relation to the ground, I have always been wondering how much output is really lost by flown subs, since I thought it wouldn't be much at all, but curious about putting some actual numbers to it. Sense it seems that "complete cancellation" right above is already down is around 45hz, so then that would seem that as the angle gets lowered to say 45 degrees in relation to the ears, sub, and ground, it seems like the frequency that would be affected would go up, as the distance between the floor bounce and ears gets shorter? {edit} So with a quick sketch, it seeming like it is reasonable to think that in the real world there is going to be a whole bunch of floor bounces reaching the ears at different times, meaning you are creating a bunch of different triangles to figure out what the difference in time arrival is? Or will there only be a small area of distance in front of the listener that there bounce would have the correct angle to bounce to the listener's ears? (This is all assuming a pretty flat and hard surface in front of the listener, no raked seating, balcony, etc.) {edit 2} Doing a little calculation, it seems like my last assumption could be wrong, sense, if the listener and flown subs are still; you can move the point along the floor in front of the listener and the total distance traveled of the reflected wave to the listener's ears seems to add up to the same, while the direct sound of course stays the same. Thanks, Phil [/QUOTE]
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