IH8PunkRok Posted January 10, 2009 Report Share Posted January 10, 2009 so im trying to figure out tuning of enclosures. i know there are calculators and stuff out there but i dont care. i want to know why when a tube is longer the resultant frequency is lower. does it have to do with the physical wavelength of a tone? (found out a 20 hz wave is 17m long!) is that why t-lines sound so good and have such good output? dont be afraid to get technical im ready for this Quote -Matt2005 Dodge Magnum RTJVC KD-AVX1 2 PPI S580.2 Obsidian Audio ST1 Horn Tweeters PRV 8MB450s Audio Legion 3500.1D 2 RE MT 18s 360 ah LiFePO4 BatterySHCA 2/0 155.2 @ 29 hzKicker CVR 15's buildDD 3512e buildMini T-Line Build(6) 8s BuildNightshade 15s Wall BuildMagnum AB XFL 12s BuildNewest Magnum Build Link to comment Share on other sites More sharing options...
HHR Ed Posted January 10, 2009 Report Share Posted January 10, 2009 It does have to do with the physical length of a wave. 20hz is 56ft long and you can figure on wave portions. Like half and quarter. Also has to do with the volume of air sitting in the tube or port or whatever it is. and the impedance of the air mass. The more mass, the harder to move so with a given amount of energy, the mass will move slower than having less mass. Get what I am saying? Quote Ed Lester ShowtimeSPL Host Showtime Electronics Video MarketingMy old Build Loghttp://www.stevemead...08/#entry511451http://www.youtube.com/showtimespl 5 time dB Drag Finalist Last ride 2007 HHR, current dB 153.5 and bass race 149.4 dB. 153.0 dB on music New Ride, 2008 HHR SS. Build under way. Loudest score ever = 171dB 2009 dB Drag Racing, North American Points Champion Link to comment Share on other sites More sharing options...
IH8PunkRok Posted January 10, 2009 Author Report Share Posted January 10, 2009 yea i get it cept for the mass part. u sayin less air takes less power to transfer the energy out of the box right? Quote -Matt2005 Dodge Magnum RTJVC KD-AVX1 2 PPI S580.2 Obsidian Audio ST1 Horn Tweeters PRV 8MB450s Audio Legion 3500.1D 2 RE MT 18s 360 ah LiFePO4 BatterySHCA 2/0 155.2 @ 29 hzKicker CVR 15's buildDD 3512e buildMini T-Line Build(6) 8s BuildNightshade 15s Wall BuildMagnum AB XFL 12s BuildNewest Magnum Build Link to comment Share on other sites More sharing options...
banginAltima Posted January 10, 2009 Report Share Posted January 10, 2009 It does have to do with the physical length of a wave.20hz is 56ft long and you can figure on wave portions. Like half and quarter. Also has to do with the volume of air sitting in the tube or port or whatever it is. and the impedance of the air mass. The more mass, the harder to move so with a given amount of energy, the mass will move slower than having less mass. Get what I am saying? So why do I hear a lot of people say "oh I get better numbers when its cold"?? I think to myself, that they only think they do... Quote If you build it, db's will come... NSPL World Record Holder Trunk 0-1800 watts---147.9 with 1722 clamped watts @ 40Hz(9-20-09). Competition Only Record Holder Trunk 0-500 watts---148.1 2006 Nissan Altima 3.5 SE Currently Rebuilding.... My 150db Plus Trunk Build I do box designs. [benH] 6:24 pm: clipping doesn't really hurt subs [benH] 6:24 pm: being an idiot is what blows subs Link to comment Share on other sites More sharing options...
HHR Ed Posted January 10, 2009 Report Share Posted January 10, 2009 yes, less air volume will take less energy but also at a higher frequency. so if you have an enclosure and want to raise your tuning, you can simply reduce the internal volume. Think of it like this. Your buddys car broke down and he needs a push, so he steers and you get to shoven. Its flat ground and its only a CRX so its pretty easy to move and you can get it up to a pretty fast pace. Now your other buddy broke down too but he has a 1979 Chevy Suburban. How easy will it be to push that and how fast can you push it? Quote Ed Lester ShowtimeSPL Host Showtime Electronics Video MarketingMy old Build Loghttp://www.stevemead...08/#entry511451http://www.youtube.com/showtimespl 5 time dB Drag Finalist Last ride 2007 HHR, current dB 153.5 and bass race 149.4 dB. 153.0 dB on music New Ride, 2008 HHR SS. Build under way. Loudest score ever = 171dB 2009 dB Drag Racing, North American Points Champion Link to comment Share on other sites More sharing options...
AI James Posted January 10, 2009 Report Share Posted January 10, 2009 So why do I hear a lot of people say "oh I get better numbers when its cold"??I think to myself, that they only think they do... its kinda the same as a cold air intake colder air is less dense therefore flowing more freely it makes sense scientifically Quote Link to comment Share on other sites More sharing options...
HHR Ed Posted January 10, 2009 Report Share Posted January 10, 2009 So why do I hear a lot of people say "oh I get better numbers when its cold"??I think to myself, that they only think they do... yeah most only think they do. Now your car and enclosure frequency response will change when air temp, density, and humidity changes. So most people dont change their frequency they play to compensate so they do a lower number. In stormy cold weather I play 42hz, in clear warm weather I play 46 hz, and do the same number Quote Ed Lester ShowtimeSPL Host Showtime Electronics Video MarketingMy old Build Loghttp://www.stevemead...08/#entry511451http://www.youtube.com/showtimespl 5 time dB Drag Finalist Last ride 2007 HHR, current dB 153.5 and bass race 149.4 dB. 153.0 dB on music New Ride, 2008 HHR SS. Build under way. Loudest score ever = 171dB 2009 dB Drag Racing, North American Points Champion Link to comment Share on other sites More sharing options...
banginAltima Posted January 10, 2009 Report Share Posted January 10, 2009 (edited) yes, less air volume will take less energy but also at a higher frequency. What about playing around 40Hz? Sorry for the hi-jack... Edited January 10, 2009 by banginAltima Quote If you build it, db's will come... NSPL World Record Holder Trunk 0-1800 watts---147.9 with 1722 clamped watts @ 40Hz(9-20-09). Competition Only Record Holder Trunk 0-500 watts---148.1 2006 Nissan Altima 3.5 SE Currently Rebuilding.... My 150db Plus Trunk Build I do box designs. [benH] 6:24 pm: clipping doesn't really hurt subs [benH] 6:24 pm: being an idiot is what blows subs Link to comment Share on other sites More sharing options...
banginAltima Posted January 10, 2009 Report Share Posted January 10, 2009 its kinda the same as a cold air intakecolder air is less dense therefore flowing more freely it makes sense scientifically Hmmm.. the colder the more dense?? Quote If you build it, db's will come... NSPL World Record Holder Trunk 0-1800 watts---147.9 with 1722 clamped watts @ 40Hz(9-20-09). Competition Only Record Holder Trunk 0-500 watts---148.1 2006 Nissan Altima 3.5 SE Currently Rebuilding.... My 150db Plus Trunk Build I do box designs. [benH] 6:24 pm: clipping doesn't really hurt subs [benH] 6:24 pm: being an idiot is what blows subs Link to comment Share on other sites More sharing options...
AI James Posted January 10, 2009 Report Share Posted January 10, 2009 yea i got that backwards Quote Link to comment Share on other sites More sharing options...
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