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<blockquote data-quote="Mark_ab" data-source="post: 35194" data-attributes="member: 541433">&quot;Standing waves are often a result of reflections of some sort and happen when a sound wave &quot;lingers&quot; in the listening area by being bounced off of reflective surfaces. They can cause frequency cancellations, freq response abnormalities, harshness, distortions, and deceptive location cues in the &quot;Up-front-bass&quot; and imaging department just to name a few. The same principles apply to standing waves that apply to reflections in general. BUT! Standing waves mostly occur INSIDE enclosures,whereas reflections often occur OUTSIDE enclosures. As with &quot;inside-enclosure&quot; reflections, the rear wave of the speaker tries to disperse into an open area. But, since the air space in the enclosure is finite, the sound wave encounters abnormal airspace resistance AND/OR reflects off the walls. This can cause the sound wave to slow down or simply bounce around in the enclosure until it loses its energy.&quot;&quot;I know there has been some debate lately on the topic &quot;to polyfill or not to polyfill&quot;, but I believe strongly that ALL sealed enclosures can realize the benefits of using loosely stuffed polyfill throughout the interior. Polyfill serves to dissipate the rear sound waves of the speaker cones and hinders the chance of reflections and standing waves re-striking the cone. This results in greater detail resolution and the elusive &quot;clean&quot; sub bass, absent of artifacts and &quot;sloppy sound&quot;. Polyfill is also known to make subs seem like they are in a bigger enclosure, but I believe the rear wave dissipation character of the stuff is responsible for the phenomenon. I&#039;d like to see someone research the effects of polyfill inside sub enclosures to see if I am right. I believe I am. &quot;(<a href="http://www.elitecaraudio.com/article.php?sid=22" target="_blank">http://www.elitecaraudio.com/article.php?sid=22</a> by Audionutz)That&#039;s where I got it from, although I probably wrote down something completely different than he was saying. Ah well.</blockquote>

[QUOTE="Mark_ab, post: 35194, member: 541433"] "Standing waves are often a result of reflections of some sort and happen when a sound wave "lingers" in the listening area by being bounced off of reflective surfaces. They can cause frequency cancellations, freq response abnormalities, harshness, distortions, and deceptive location cues in the "Up-front-bass" and imaging department just to name a few. The same principles apply to standing waves that apply to reflections in general. BUT! Standing waves mostly occur INSIDE enclosures, whereas reflections often occur OUTSIDE enclosures. As with "inside-enclosure" reflections, the rear wave of the speaker tries to disperse into an open area. But, since the air space in the enclosure is finite, the sound wave encounters abnormal airspace resistance AND/OR reflects off the walls. This can cause the sound wave to slow down or simply bounce around in the enclosure until it loses its energy." "I know there has been some debate lately on the topic "to polyfill or not to polyfill", but I believe strongly that ALL sealed enclosures can realize the benefits of using loosely stuffed polyfill throughout the interior. Polyfill serves to dissipate the rear sound waves of the speaker cones and hinders the chance of reflections and standing waves re-striking the cone. This results in greater detail resolution and the elusive "clean" sub bass, absent of artifacts and "sloppy sound". Polyfill is also known to make subs seem like they are in a bigger enclosure, but I believe the rear wave dissipation character of the stuff is responsible for the phenomenon. I'd like to see someone research the effects of polyfill inside sub enclosures to see if I am right. I believe I am. " ([URL="http://www.elitecaraudio.com/article.php?sid=22"]http://www.elitecaraudio.com/article.php?sid=22[/URL] by Audionutz) That's where I got it from, although I probably wrote down something completely different than he was saying. Ah well. [/QUOTE]

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