Reply to thread

Message

<blockquote data-quote="Buck" data-source="post: 8887631" data-attributes="member: 591582">I just always look at everything from the view of an organ pipe:[ATTACH=full]62325[/ATTACH]Distance is tuning.&nbsp; A transmission line type enclosure is based on the quarter wave that is the same as organ pipes that have one open end and one closed end.&nbsp; You can look at a whole vehicle this way, or the distance in between radiating surfaces, and how the distance changes phasing, like subwoofer distance from port opening.&nbsp; It happens in 3-D, but looking at it from a 2-d perspective can help with basic understanding and calculations.&nbsp; For example, you can look at the length of your whole cabin as the internal 1/4 length of the transmission line enclosure or of an organ pipe.&nbsp; Front firing in a trunk without sealing off for a ported enclosure can make the air in between the outside of the box and the inner trunk walls into its own enclosure that can be unintentionally &quot;tuned&quot; to cancel out wanted frequencies from your box.&nbsp; Visualization of sound in pipes or ports or t-lines, think like 1/4 wave tuning and standing waves:&nbsp;Lower frequency:[ATTACH=full]62333[/ATTACH]Higher frequency:[ATTACH=full]62334[/ATTACH][URL unfurl=&quot;true&quot;]https://resource.isvr.soton.ac.uk/spcg/tutorial/tutorial/Tutorial_files/Web-standing-pipe.htm[/URL]</blockquote>

[QUOTE="Buck, post: 8887631, member: 591582"] I just always look at everything from the view of an organ pipe: [ATTACH type="full"]62325[/ATTACH] Distance is tuning. A transmission line type enclosure is based on the quarter wave that is the same as organ pipes that have one open end and one closed end. You can look at a whole vehicle this way, or the distance in between radiating surfaces, and how the distance changes phasing, like subwoofer distance from port opening. It happens in 3-D, but looking at it from a 2-d perspective can help with basic understanding and calculations. For example, you can look at the length of your whole cabin as the internal 1/4 length of the transmission line enclosure or of an organ pipe. Front firing in a trunk without sealing off for a ported enclosure can make the air in between the outside of the box and the inner trunk walls into its own enclosure that can be unintentionally "tuned" to cancel out wanted frequencies from your box. Visualization of sound in pipes or ports or t-lines, think like 1/4 wave tuning and standing waves: Lower frequency: [ATTACH type="full"]62333[/ATTACH] Higher frequency: [ATTACH type="full"]62334[/ATTACH] [URL unfurl="true"]https://resource.isvr.soton.ac.uk/spcg/tutorial/tutorial/Tutorial_files/Web-standing-pipe.htm[/URL] [/QUOTE]

Verification