juan777 Posted July 29, 2014 Report Share Posted July 29, 2014 Let's forget about subs for a second, assume you have amazing subs that can play very low or high. How would you tune a Sub box to play very strong lows? I don't mean "How do you tune a box to a certain freq?" either, I mean "How can I design a box to play low?" I have heard "lots of port area" "less port area" "1 port" "Multiple ports" and many other contradicting answers. And for that matter how do you design a box for a strong high performance? Building tutorials and tips are welcome Once again, NOT ASKING HOW TO TUNE A BOX, this question is about box design and optimization. The L@zy Hoe 2005 Chevy Tahoe 2,500 Watts of Highs/Mids 4 10 midrange 4 6.5 midwoofers 4 Tweeters 6 Supertweeters 2 Lithium 80AH Batteries 24K Watts 4 Custom 18s Quad alt setup Rebuilt 250amp and 3 370s Interior work by Lone Star Auto Works The Build Log Like Loud Bass? Click Here! On 12/5/2014 at 8:06 PM, juan777 said: See yall there, I'll be the drunk Mexican with aviators on. On 12/6/2014 at 10:32 PM, boom50cal said: I did see Juan LMFAO! He REALLY WAS the drunk mexican with Aviators on! Link to comment Share on other sites More sharing options...
Kyblack76 Posted July 29, 2014 Report Share Posted July 29, 2014 !Million dollar question. If you could just whip one out , sketch uo style ,,you'd make good money. Test test test change change test rebuild seems my route. Guess I'm doing it all wrong. SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold Link to comment Share on other sites More sharing options...
hoit Posted July 29, 2014 Report Share Posted July 29, 2014 ^^^i'd say that's right on point, especially when working with 4ths and 6ths, so I hear...no matter how sweet it looks in design, you never really know till you slap it in there. 2007 Chevy Aveo Ls sedan 2 Sundown Xv2 on scv4k @ .5 ohm 2 pair RE XXX 6.5 components on sax200.4 @ 2 ohm Big Three, Three runs 1/0 power from front to back, 1 ground front to back Two runs ground from rear bank to chassis XS power d3100 upfront, 3 Odyssey 2150s in bank Singer 220 amp alt Link to comment Share on other sites More sharing options...
khinds94 Posted July 29, 2014 Report Share Posted July 29, 2014 Quick question. Normally when you tune a ported box it will peak higher than on paper or on win isd. Does this also occur in 4th order and 6th order boxes? I know in my car I wanted it to peak in the mid 30s. So I had to tune in the high 20s. 03 Sable LS AA mayhem 12" D2 Sundown ZV4 12" D1 Tantric HD 12" D2 Tantric SHD 12" D1 Sundown X12 V2 D2 2.5 cu net Sundown 2000d @ 1 ohm XS Power XP2000 Sky High Sound Deadener Sky High wire Stock alt Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted July 29, 2014 Report Share Posted July 29, 2014 Quick question. Normally when you tune a ported box it will peak higher than on paper or on win isd. Does this also occur in 4th order and 6th order boxes? I know in my car I wanted it to peak in the mid 30s. So I had to tune in the high 20s. The important thing to remember here is that the output from the box is not changed by being in your car. If you build a box with a moderate hump in output at 30 Hz, it is going to have that 30 Hz hump whether it is in your car, in your house, or out in the middle of a field. What changes is how your car effects that output (i.e. cabin gain). If your car naturally significantly boosts output at 40 Hz, its going to boost 40 Hz no matter what kind of box you have in there (though placement in the vehicle does have a big impact, along with other factors). This is why your car peaks higher than what your box is tuned to. What the box outputs and the acoustic effects of your car are both components that add together to determine what your car is going to end up sounding like. So to answer your question, if your car naturally has a peak at some frequency with a ported box it is going to have a similar peak with a 4th or 6th order bandpass as well, assuming they are in the same location as the ported box was. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
khinds94 Posted July 29, 2014 Report Share Posted July 29, 2014 Quick question. Normally when you tune a ported box it will peak higher than on paper or on win isd. Does this also occur in 4th order and 6th order boxes? I know in my car I wanted it to peak in the mid 30s. So I had to tune in the high 20s. The important thing to remember here is that the output from the box is not changed by being in your car. If you build a box with a moderate hump in output at 30 Hz, it is going to have that 30 Hz hump whether it is in your car, in your house, or out in the middle of a field. What changes is how your car effects that output (i.e. cabin gain). If your car naturally significantly boosts output at 40 Hz, its going to boost 40 Hz no matter what kind of box you have in there (though placement in the vehicle does have a big impact, along with other factors). This is why your car peaks higher than what your box is tuned to. What the box outputs and the acoustic effects of your car are both components that add together to determine what your car is going to end up sounding like. So to answer your question, if your car naturally has a peak at some frequency with a ported box it is going to have a similar peak with a 4th or 6th order bandpass as well, assuming they are in the same location as the ported box was. Thanks for the informative answer. Helped me out. 03 Sable LS AA mayhem 12" D2 Sundown ZV4 12" D1 Tantric HD 12" D2 Tantric SHD 12" D1 Sundown X12 V2 D2 2.5 cu net Sundown 2000d @ 1 ohm XS Power XP2000 Sky High Sound Deadener Sky High wire Stock alt Link to comment Share on other sites More sharing options...
juan777 Posted July 29, 2014 Author Report Share Posted July 29, 2014 What about in general? I have heard that you can get a box to play better lower if your port area is right around 12in per cuft maybe even less. The reasoning being that it will act a bit more like a sealed enclosure. Same concept seems to apply to enclosures that are designed for highs, not a lot of boxes are built for "highs" outside of burp boxes but I have heard some people will have port area in the 18in per cuft. Any truth to that? The L@zy Hoe 2005 Chevy Tahoe 2,500 Watts of Highs/Mids 4 10 midrange 4 6.5 midwoofers 4 Tweeters 6 Supertweeters 2 Lithium 80AH Batteries 24K Watts 4 Custom 18s Quad alt setup Rebuilt 250amp and 3 370s Interior work by Lone Star Auto Works The Build Log Like Loud Bass? Click Here! On 12/5/2014 at 8:06 PM, juan777 said: See yall there, I'll be the drunk Mexican with aviators on. On 12/6/2014 at 10:32 PM, boom50cal said: I did see Juan LMFAO! He REALLY WAS the drunk mexican with Aviators on! Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted July 30, 2014 Report Share Posted July 30, 2014 What about in general? I have heard that you can get a box to play better lower if your port area is right around 12in per cuft maybe even less. The reasoning being that it will act a bit more like a sealed enclosure. Same concept seems to apply to enclosures that are designed for highs, not a lot of boxes are built for "highs" outside of burp boxes but I have heard some people will have port area in the 18in per cuft. Any truth to that? The "port area per cube" rule is a very simplistic method for determining how much port to use. While it may get you in the ballpark sometimes, the problem with it is its an incomplete answer. Using the "port area per cube" rule a 12 mm xmax sub on 400 watts would use the same port as a 30 mm xmax sub on 3K watts as long as the box they went in had the same volume. Obviously that's not going to be ideal in one or probably both situations. For this reason building a box with 12 sq in per cube to hit low notes better is an equally incomplete methodology. Short answer: no there is not any truth to that, at least in my experience. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
juan777 Posted July 30, 2014 Author Report Share Posted July 30, 2014 So no way to tell without testing I guess. That's half the fun anyway! Thanks everyone The L@zy Hoe 2005 Chevy Tahoe 2,500 Watts of Highs/Mids 4 10 midrange 4 6.5 midwoofers 4 Tweeters 6 Supertweeters 2 Lithium 80AH Batteries 24K Watts 4 Custom 18s Quad alt setup Rebuilt 250amp and 3 370s Interior work by Lone Star Auto Works The Build Log Like Loud Bass? Click Here! On 12/5/2014 at 8:06 PM, juan777 said: See yall there, I'll be the drunk Mexican with aviators on. On 12/6/2014 at 10:32 PM, boom50cal said: I did see Juan LMFAO! He REALLY WAS the drunk mexican with Aviators on! Link to comment Share on other sites More sharing options...
ChatraN Posted July 30, 2014 Report Share Posted July 30, 2014 it's about compression, mass loading and containing all the air that our subs move in the most efficient way inside the cabin. Link to comment Share on other sites More sharing options...
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