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<blockquote data-quote="ciaonzo" data-source="post: 6539214" data-attributes="member: 607015"><p>I modeled for both "flat" and output-oriented but mbrooky beat me to the punch for the output numbers. His results matched mine nearly perfectly so I just modeled what he posted instead and created an overlay plot so you can compare the two. The bluish color is the "flat" model and will cater to a better balance for music purposes. The magenta color is the output model will provide more impact and will suit hip-hop nicely. It will have a higher group delay but nothing grotesque. I come from the school of anything higher than 10milliseconds above 40Hz is undesirable so this one just sneaks in there. Both are good models and it will come down to personal taste. Somewhat flat in-car response is achieved with 2cu.ft. @30Hz, 31.5sq.in. of vent area (I modeled with 14 x 2.25) with 43.25" of length. A minimal amount of lining on the walls but do not inhibit airflow for the vent. I did not bother with a drawing because I assume you know how to figure for volume and displacements. I rarely bother with a drawing, truthfully.</p><p></p><p>The six graphs illustrate the following;</p><p></p><p><strong>Upper left</strong> - normalized frequency response (generic in-car transfer function applied)</p><p></p><p><strong>Upper right</strong> - group delay</p><p></p><p><strong>Middle left</strong> - vent velocity with 2000 watts of power input (both are great)</p><p></p><p><strong>Middle right</strong> - acoustic power, this helps you visualize the thermal and mechanical limits.</p><p></p><p><strong>Lower left</strong> - excursion with 2000 watts of power input</p><p></p><p><strong>Lower right </strong>- impedance curve</p><p></p><p><a href="http://i704.photobucket.com/albums/ww43/ciaonzo/Temp/mendon.jpg" target="_blank">http://i704.photobucket.com/albums/ww43/ciaonzo/Temp/mendon.jpg</a></p></blockquote><p></p>
[QUOTE="ciaonzo, post: 6539214, member: 607015"] I modeled for both "flat" and output-oriented but mbrooky beat me to the punch for the output numbers. His results matched mine nearly perfectly so I just modeled what he posted instead and created an overlay plot so you can compare the two. The bluish color is the "flat" model and will cater to a better balance for music purposes. The magenta color is the output model will provide more impact and will suit hip-hop nicely. It will have a higher group delay but nothing grotesque. I come from the school of anything higher than 10milliseconds above 40Hz is undesirable so this one just sneaks in there. Both are good models and it will come down to personal taste. Somewhat flat in-car response is achieved with 2cu.ft. @30Hz, 31.5sq.in. of vent area (I modeled with 14 x 2.25) with 43.25" of length. A minimal amount of lining on the walls but do not inhibit airflow for the vent. I did not bother with a drawing because I assume you know how to figure for volume and displacements. I rarely bother with a drawing, truthfully. The six graphs illustrate the following; [B]Upper left[/B] - normalized frequency response (generic in-car transfer function applied) [B]Upper right[/B] - group delay [B]Middle left[/B] - vent velocity with 2000 watts of power input (both are great) [B]Middle right[/B] - acoustic power, this helps you visualize the thermal and mechanical limits. [B]Lower left[/B] - excursion with 2000 watts of power input [B]Lower right [/B]- impedance curve [URL="http://i704.photobucket.com/albums/ww43/ciaonzo/Temp/mendon.jpg"]http://i704.photobucket.com/albums/ww43/ciaonzo/Temp/mendon.jpg[/URL] [/QUOTE]
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