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Why Do TEF Systems read 3-5 dB high ?
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<blockquote data-quote="Art Welter" data-source="post: 24038" data-attributes="member: 52"><p>Re: Why Do TEF Systems read 3-5 dB high ?</p><p></p><p></p><p> </p><p>Thanks Ivan,</p><p></p><p>The BFM chart appears to be measurements from 2006 and 2007 Tulsa sub shootouts. Although they do appear to have been “redrawn”, I spent hours comparing dozens of individual charts, they seem to be correct as far as representing those shootouts.</p><p></p><p>I’m aware of various measurement calibration issues at various sub shootouts, and the changes of cabinet and speaker types makes for a moving target.</p><p></p><p>I’m not sure which version of the TH- 215 was at the 2007 NYC sub shootout, there are two fairly different versions (size, weight, power ratings, impedance, frequency response) published from DSL, I did the comparison between the “flatter” version and the EV 2180, it was 2.5 dB off. Looking at the less flat version, the difference is minimal.</p><p></p><p>However, looking at the upper end of the TH-115 compared to the EV-2181 in the 2007 NYC shootout, the EV has about a dB more response at 100 Hz than the TH-115, yet on the outdoor chart you took around that time, compared to the EV published chart it looks to be 5 dB down from the TH-115 response.</p><p></p><p>That is a six dB difference between published and side by side in room comparisons, even with the known NYC room problems, that is hard to ignore.</p><p></p><p>I could point out more references, but it would be far easier to see if these differences are real if you have any straight A/B comparisons of any single unit production subs that have published frequency response charts to single DSL products, preferably measured outdoors.</p></blockquote><p></p>
[QUOTE="Art Welter, post: 24038, member: 52"] Re: Why Do TEF Systems read 3-5 dB high ? Thanks Ivan, The BFM chart appears to be measurements from 2006 and 2007 Tulsa sub shootouts. Although they do appear to have been “redrawn”, I spent hours comparing dozens of individual charts, they seem to be correct as far as representing those shootouts. I’m aware of various measurement calibration issues at various sub shootouts, and the changes of cabinet and speaker types makes for a moving target. I’m not sure which version of the TH- 215 was at the 2007 NYC sub shootout, there are two fairly different versions (size, weight, power ratings, impedance, frequency response) published from DSL, I did the comparison between the “flatter” version and the EV 2180, it was 2.5 dB off. Looking at the less flat version, the difference is minimal. However, looking at the upper end of the TH-115 compared to the EV-2181 in the 2007 NYC shootout, the EV has about a dB more response at 100 Hz than the TH-115, yet on the outdoor chart you took around that time, compared to the EV published chart it looks to be 5 dB down from the TH-115 response. That is a six dB difference between published and side by side in room comparisons, even with the known NYC room problems, that is hard to ignore. I could point out more references, but it would be far easier to see if these differences are real if you have any straight A/B comparisons of any single unit production subs that have published frequency response charts to single DSL products, preferably measured outdoors. [/QUOTE]
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