Tuning a box to a low frequency while maintaining specified dimensions =S
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Silver Member Username: J_c_wheeler8Columbus, IN United States Post Number: 490 Registered: May-06 | Hey guys, the only way I know to tune a box is type in my info on ecoustics and let that spit out my box dimensions. Is there a way to almost work in reverse? Given a box roughly 36"x14.5"x16" is there a way to adjust the port length only to tune a box lower? Make it longer, make it shorter, what can i do? My trunk is small, and these dimensions are the best I can work with. Is there a formula to calculate box frequency? |
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Silver Member Username: TheweaselSteamboat springs, Colorado U.S. of A Post Number: 728 Registered: Mar-06 | not sure what you're looking for but this site works well http://www.carstereo.com/help2/Articles.cfm?id=31 |
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Gold Member Username: WingmanaliveA pic is worth 1000 posts!! Post Number: 6404 Registered: Jun-06 | You can add damping material to increase the box's calculated volume to compensate for lack of space or design limitations/mistakes. I believe it adds 10%-15%. Not much to work with. Not to mention if it's a slot ported box you'll have to tear the box apart to even get to lengthen it if you can. |
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Gold Member Username: InsearchofbassPost Number: 5037 Registered: Jun-04 | actually 30 to 40 percent...take a look http://web.archive.org/web/20020808224043/integra.cyberglobe.net/caraudio/resour ces/fiberfill/ |
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Gold Member Username: InsearchofbassPost Number: 5038 Registered: Jun-04 | there this one works http://web.archive.org/web/20020808224043/integra.cyberglobe.net/caraudio/resour ces/fiberfill/ |
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Gold Member Username: WingmanaliveA pic is worth 1000 posts!! Post Number: 6405 Registered: Jun-06 | Wow. I've always read/heard a 15% gain was all you could get. However all that polyfill reduces the option of lengthening the port. I bet alot of guys wish they knew that^^^ b4 redesigning their boxes...... |
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Silver Member Username: J_c_wheeler8Columbus, IN United States Post Number: 492 Registered: May-06 | It is possible for me to make a new box, but how much of that fiberfill should I add if my box is roughly 47HZ now and I want it to be 33HZ. |
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Silver Member Username: J_c_wheeler8Columbus, IN United States Post Number: 494 Registered: May-06 | say there is a 25% gain from my box, this still doesnt tell me what my new frequency would be? How would I figure this? |
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Gold Member Username: WingmanaliveA pic is worth 1000 posts!! Post Number: 6407 Registered: Jun-06 | If you add the 25% to the box's volume then calculating the tuning is the same. Assume the new volume and use ^^^ Rob's calculator to determine port size/length. If you have to adjust it's size/length to keep or change your tuning so be it. Like I said, have fun if the slot interfears with all the poly. Sometimes there's only so much you can do. |
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Gold Member Username: InsearchofbassPost Number: 5039 Registered: Jun-04 | in the case of a ported box id use the sheets not the loose stuff of course |
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Gold Member Username: WingmanaliveA pic is worth 1000 posts!! Post Number: 6408 Registered: Jun-06 | Or confetti. That would look cool flying out the port! |
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Gold Member Username: InsearchofbassPost Number: 5041 Registered: Jun-04 | LOL |
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