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<blockquote data-quote="Kimo Lewis" data-source="post: 26474" data-attributes="member: 497">Impulse Responce correction on and off axisIt is possible to improve most loudspeaker&#039;s impulse response on and off axis with FIR correction.&nbsp; This is a major point of David Gunness&#039; paper ( <a href="http://fulcrum-acoustic.com/wordpres...ssing-2005.pdf" target="_blank">http://fulcrum-acoustic.com/wordpres...ssing-2005.pdf</a> ) which I made reference to in my first post, which you may not have read.&nbsp; The trick is to improve the &quot;worst&quot; direction.&nbsp; To be clear, the following quote is in reference to a cone loudspeaker, which typically has little directionality at 1000 hz (for 12&quot; speaker) and lower:&quot;The directionality of a loudspeaker also affects its transient response, but it is not a 2-port characteristic.&nbsp; Hence it cannot be corrected everywhere.&nbsp; However, the transient response can be modified in a way that produces greater consistency throughout the pattern.&nbsp; By improving the transient response in the &quot;worst&quot; direction, at the expense of the transient response in the &quot;best&quot; direction, the sound quality can be made more consistent over the breadth of the coverage pattern.&nbsp; This is exactly what has been implemented in the example shown.&nbsp; The off axis spectrogram, shown in figures 3.3.3 and 3.3.4, shows a degree of improvement similar to that observed on axis.&quot;Attached are more measurements of a product which improves the transient response of most speaker systems both on axis and 30 degrees off axis (60 deg bandwidth) with FIR correction.&nbsp; Information may be located here:<a href="http://www.musicanddesign.com/pubimages/UE-2-way.GIF" target="_blank">http://www.musicanddesign.com/pubimages/UE-2-way.GIF</a><a href="http://techtalk.parts-express.com/showthread.php?t=218580" target="_blank">http://techtalk.parts-express.com/showthread.php?t=218580</a>And here are two more self-powered monitor/FOH speaker systems which have jumped on the bandwagon, to correct impulse response using FIR:<a href="http://www.yamahaproaudio.com/products/speakers/dsr_series/" target="_blank">http://www.yamahaproaudio.com/products/speakers/dsr_series/</a><a href="http://www.dasaudio.com/index.asp?pagina=actualidad&amp;subpagina=2343&amp;c=125" target="_blank">http://www.dasaudio.com/index.asp?pagina=actualidad&amp;subpagina=2343&amp;c=125</a>[ATTACH]149673[/ATTACH]</blockquote>

[QUOTE="Kimo Lewis, post: 26474, member: 497"] Impulse Responce correction on and off axis It is possible to improve most loudspeaker's impulse response on and off axis with FIR correction. This is a major point of David Gunness' paper ( [URL]http://fulcrum-acoustic.com/wordpres...ssing-2005.pdf[/URL] ) which I made reference to in my first post, which you may not have read. The trick is to improve the "worst" direction. To be clear, the following quote is in reference to a cone loudspeaker, which typically has little directionality at 1000 hz (for 12" speaker) and lower: "The directionality of a loudspeaker also affects its transient response, but it is not a 2-port characteristic. Hence it cannot be corrected everywhere. However, the transient response can be modified in a way that produces greater consistency throughout the pattern. By improving the transient response in the "worst" direction, at the expense of the transient response in the "best" direction, the sound quality can be made more consistent over the breadth of the coverage pattern. This is exactly what has been implemented in the example shown. The off axis spectrogram, shown in figures 3.3.3 and 3.3.4, shows a degree of improvement similar to that observed on axis." Attached are more measurements of a product which improves the transient response of most speaker systems both on axis and 30 degrees off axis (60 deg bandwidth) with FIR correction. Information may be located here: [URL]http://www.musicanddesign.com/pubimages/UE-2-way.GIF[/URL] [URL]http://techtalk.parts-express.com/showthread.php?t=218580[/URL] And here are two more self-powered monitor/FOH speaker systems which have jumped on the bandwagon, to correct impulse response using FIR: [URL]http://www.yamahaproaudio.com/products/speakers/dsr_series/[/URL] [URL]http://www.dasaudio.com/index.asp?pagina=actualidad&subpagina=2343&c=125[/URL] [ATTACH=CONFIG]149673.vB5-legacyid=1194[/ATTACH] [/QUOTE]

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