Reply to thread

Message

<blockquote data-quote="n2audio" data-source="post: 3452979" data-attributes="member: 540940">So I&#039;m planning for a single ported 12&quot; sub enclosure for the trunk of the new contour.&nbsp; Temporarily I&#039;ll just use one of my trusty Pyramid 1295US&#039;s, but if things go well I&#039;m going to spend a few bux on an Opti1232D so I&#039;m using those T/S numbers.&nbsp; 90sq/10splLanzar&#039;s recommendation for &quot;large ported&quot; is 1.8cf, 3&quot; port 6&quot; long with a tuning freq of about 36.&nbsp; Those numbers produce a pretty ugly graph in winISD, and excessive port velocity.&nbsp; There&#039;s a +4db peak at 44hz, f3&#039;s about 30.I get a good (close to flat) curve with a 2.2cf net enclosure (~2.6 gross), 2x8&quot; port, 24.74&quot; long, tuned at 26.26 seems really low -&nbsp; gives me an F3 of about 24 (ssf would be at about 30).&nbsp; I&#039;ll rarely listen to anything much below 40, but to get well into the 30&#039;s and still have some SPL would definitely do something for the wow factor.Do the graphs ever match up to the real world?&nbsp; Is there any sort of recipe to get decent sound out of a ported enclosure in a trunk?&nbsp; Should the sub face the backseat or the rear of the car? (the port will fire out the side)<img src="http://img.photobucket.com/albums/v637/Liquid_force/enclsketch.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

[QUOTE="n2audio, post: 3452979, member: 540940"] So I'm planning for a single ported 12" sub enclosure for the trunk of the new contour. Temporarily I'll just use one of my trusty Pyramid 1295US's, but if things go well I'm going to spend a few bux on an Opti1232D so I'm using those T/S numbers. 90sq/10spl Lanzar's recommendation for "large ported" is 1.8cf, 3" port 6" long with a tuning freq of about 36. Those numbers produce a pretty ugly graph in winISD, and excessive port velocity. There's a +4db peak at 44hz, f3's about 30. I get a good (close to flat) curve with a 2.2cf net enclosure (~2.6 gross), 2x8" port, 24.74" long, tuned at 26. 26 seems really low - gives me an F3 of about 24 (ssf would be at about 30). I'll rarely listen to anything much below 40, but to get well into the 30's and still have some SPL would definitely do something for the wow factor. Do the graphs ever match up to the real world? Is there any sort of recipe to get decent sound out of a ported enclosure in a trunk? Should the sub face the backseat or the rear of the car? (the port will fire out the side) [IMG]http://img.photobucket.com/albums/v637/Liquid_force/enclsketch.jpg[/IMG] [/QUOTE]

Verification