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Tuning frequency help
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<blockquote data-quote="Doxquzme" data-source="post: 8848766" data-attributes="member: 689267"><p>Their website indicates the following: Ported enclosure 4.5ft-6.5ft tuned @35hertz with 12-16sqaure inch of port area per cubic foot. That is for a standard ported bass reflex though, 4th order band pass is a whole different beast. If you are using a subsonic filter on your amp, set at at 10-20Hz, you could tune as low as 25 (assuming the subsonic xover is a 12db slope). Fs is right around that point and as a rule, I don’t usually tune lower than the resonate frequency of the driver. If you have the ability to add length to the port, temporarily, you could simply start at say 35Hz, tape on couple of inches and listen. At some point you will decide which is best to your ears. Once you have found what you like, then install the port permanently. the12volt.com has some good calculators that will allow you to determine the frequency the temp extensions are playing at. I would not go much below the resonate frequency though, say 23Hz at the lowest. Many people find that they actually prefer the punch at 35-45Hz as opposed to shear low end. I've run these specs through bass box pro and it indicates (as does the mfg’s site) around 35Hz. Any lower (an extended bass configuration tuned to let’s say 25Hz) and you start getting cone displacement (MM/Hz) power issues and the extended bass frequency comes at the cost of wasted power. I see about a 25% to 50% drop in usable power input levels before distortion kicks in at that frequency, so low end at the cost of higher volume, can’t have both. Keep in mind that in a car, you probably won’t know or be able to actually realize the difference between 25Hz and 35Hz, the sound wave is just too long. People outside will notice it better than you can in the car. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="Doxquzme, post: 8848766, member: 689267"] Their website indicates the following: Ported enclosure 4.5ft-6.5ft tuned @35hertz with 12-16sqaure inch of port area per cubic foot. That is for a standard ported bass reflex though, 4th order band pass is a whole different beast. If you are using a subsonic filter on your amp, set at at 10-20Hz, you could tune as low as 25 (assuming the subsonic xover is a 12db slope). Fs is right around that point and as a rule, I don’t usually tune lower than the resonate frequency of the driver. If you have the ability to add length to the port, temporarily, you could simply start at say 35Hz, tape on couple of inches and listen. At some point you will decide which is best to your ears. Once you have found what you like, then install the port permanently. the12volt.com has some good calculators that will allow you to determine the frequency the temp extensions are playing at. I would not go much below the resonate frequency though, say 23Hz at the lowest. Many people find that they actually prefer the punch at 35-45Hz as opposed to shear low end. I've run these specs through bass box pro and it indicates (as does the mfg’s site) around 35Hz. Any lower (an extended bass configuration tuned to let’s say 25Hz) and you start getting cone displacement (MM/Hz) power issues and the extended bass frequency comes at the cost of wasted power. I see about a 25% to 50% drop in usable power input levels before distortion kicks in at that frequency, so low end at the cost of higher volume, can’t have both. Keep in mind that in a car, you probably won’t know or be able to actually realize the difference between 25Hz and 35Hz, the sound wave is just too long. People outside will notice it better than you can in the car. ;) [/QUOTE]
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