posted
Ok, here's the deal. I am a junior in highschool and there is a science fair in my town coming up in the spring. I want to do a project based on gaining the highest spl in my truck. I know it sounds corny, but it is not just going to be a simple project. I was thinking of proving ideas and concepts using some cool research tools and getting some good graphs of in-box impedance rises, box placement, transfer functions, and other stuff like that. Anyone have any ideas on where to start? I really want to get some good props for car audio and try to show the usefulness of the sport and hopefully get some help from some of the record holders to draw some attention to the sport. Maybe I could get some pictures of the Beast and Mike's van to gain people's interest. I hope that I don't get some closed-minded judge like officer doofy off that TLC show judging my project.
Any suggestions on sites that have technical information? I need equations or charts so I can get an idea of what I need to test.
[ 11-26-2001: Message edited by: Beebs ]
-------------------- Infiniti Qx4: Pioneer P930 H/U, Epic150, MTX8100d, 2 Alpine TypeR 12 SVC's with 1.28cuft tuned to 31hz, JL XR6.5 components (JL 300/4)/VR6 Coaxials (Other half of 300/4) F/R, 1 Farad Stinger HPM Cap, 2 Optima Red-Tops (Soon to be 3), 0/1 Gauge Stinger Wire, All Stinger HPM Fuses and Fuseholders, Cold Air Intake, HKSuv Sport Exhaust, Ignition System
slight start for cancellation pics, wavelengths, and horn box calculations
-------------------- "Those who give up liberty for the sake of security deserve neither liberty nor security" - Benjamin Franklin
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Elemental Designs
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--------------------------------- Loud...it's when you can see the ground move, it's when you have to force yourself to breath, it's when the rest of the world ceases to exist.
posted
Thanks for the links. I don't think I am going to do a horn box, because I am probably going to have to build multiple boxes, and I don't to have to deal with horns. Anyways, I need to find an o'scope, an oscillator, a distortion analyzer, and a good multimeter. Any recommendations? I have no idea what to look for in an o'scope, distortion analyzer or oscillator. I might be able to pick some stuff off e-bay or borrow some from school if they have anything.
-------------------- Infiniti Qx4: Pioneer P930 H/U, Epic150, MTX8100d, 2 Alpine TypeR 12 SVC's with 1.28cuft tuned to 31hz, JL XR6.5 components (JL 300/4)/VR6 Coaxials (Other half of 300/4) F/R, 1 Farad Stinger HPM Cap, 2 Optima Red-Tops (Soon to be 3), 0/1 Gauge Stinger Wire, All Stinger HPM Fuses and Fuseholders, Cold Air Intake, HKSuv Sport Exhaust, Ignition System
148db's at 45hz... Posts: 239 | From: Mobile, Alabama | Registered: Mar 2001
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posted
Basically the objective is to design the highest spl in my vehicle... I will try and make it very efficient and use several "test" boxes to find the highest SPL possible. I am probably going to graph my transfer function, port gain, in-box impedance, and distortion %'s. My goal is the highest SPL possible (w/o building a wall or something to crazy), so I need every advantage I can get. This project is going to be great because I can get props from school and do what I need to do anyways. Hopefully, I will conduct the testing using two alpine type-r 15's and two mtx 8100d's.
-------------------- Infiniti Qx4: Pioneer P930 H/U, Epic150, MTX8100d, 2 Alpine TypeR 12 SVC's with 1.28cuft tuned to 31hz, JL XR6.5 components (JL 300/4)/VR6 Coaxials (Other half of 300/4) F/R, 1 Farad Stinger HPM Cap, 2 Optima Red-Tops (Soon to be 3), 0/1 Gauge Stinger Wire, All Stinger HPM Fuses and Fuseholders, Cold Air Intake, HKSuv Sport Exhaust, Ignition System
148db's at 45hz... Posts: 239 | From: Mobile, Alabama | Registered: Mar 2001
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posted
uhhh heh with those 15s and those amps you wont need to worry where you put em i just finished a 3/4 10 cube ported wall, with the same subs and amps and can you say SICKKKKKKK.... i cant even sit in the car
-------------------- Clarion DRX9675Rz MTX 81000D Alpine Type-R 12's in one sick box Infinity reference Crossfire BMF Components Alpine MRV-F407 Posts: 197 | From: Pittsburgh, PA, USA | Registered: Aug 2000
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posted
I know that , but that doesn't really help me with my project... I am going to have to give a bunch of graphs of what makes the system louder, for instance, port location, box location, box size, port size, in-box impedance, and other wierd stuff. I am just trying to design an extremely "efficient" set-up.
-------------------- Infiniti Qx4: Pioneer P930 H/U, Epic150, MTX8100d, 2 Alpine TypeR 12 SVC's with 1.28cuft tuned to 31hz, JL XR6.5 components (JL 300/4)/VR6 Coaxials (Other half of 300/4) F/R, 1 Farad Stinger HPM Cap, 2 Optima Red-Tops (Soon to be 3), 0/1 Gauge Stinger Wire, All Stinger HPM Fuses and Fuseholders, Cold Air Intake, HKSuv Sport Exhaust, Ignition System
148db's at 45hz... Posts: 239 | From: Mobile, Alabama | Registered: Mar 2001
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posted
I would be perfectly willing to give you a hand with this, but I'd also like to get Colin, JC and Dank with me as well.. Anybody interested in doing a correspondance for this project?
ShadowStar
-------------------- You can't build a reputation for what you're GOING to do.. But you can build one for TALKING about it!
It's all about knowledge, love and respect.
Posts: 2578 | From: Somewhere In the Northeast | Registered: May 1999
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posted
Thanks!!! I really haven't done to much testing, but that is really the reason I choose this project. I will probably be able to get my parents to help sponsor me with all the wood I will need and maybe some other stuff. I 3 o'scopes at the school. I don't know anything about them though, other than the fact that one is accurate up to 10volts which I don't think will help. The other two are >50mhz's. I just need all of the little tips that will probably be beneficial along with box design. I don't have to do it right the first time because I plan on building about 3+ boxes with different sizes, and sub/port layouts.
-------------------- Infiniti Qx4: Pioneer P930 H/U, Epic150, MTX8100d, 2 Alpine TypeR 12 SVC's with 1.28cuft tuned to 31hz, JL XR6.5 components (JL 300/4)/VR6 Coaxials (Other half of 300/4) F/R, 1 Farad Stinger HPM Cap, 2 Optima Red-Tops (Soon to be 3), 0/1 Gauge Stinger Wire, All Stinger HPM Fuses and Fuseholders, Cold Air Intake, HKSuv Sport Exhaust, Ignition System
148db's at 45hz... Posts: 239 | From: Mobile, Alabama | Registered: Mar 2001
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posted
hey guys- if there is going to be some collaboration between you, i would like to suggest something. this site http://www.efmax.co.uk/box.htm gives a pretty good description on what is involved in designing the RIGHT box with the right subwoofer and is FULL of graphs. however, it leaves much to be desired. I think that if you can stretch this short tutorial into ten times its size, than it would be the most complete ground up tutorial on speaker enclosure design i have ever seen. explain terminology and concepts pretty much from the ground up and i think you can something incredible work. fully understanding ported enclosures is a good start for any audiophile...
Posts: 1467 | From: eureka, ca | Registered: Aug 2001
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quote:Originally posted by stabmaster: hey guys- if there is going to be some collaboration between you, i would like to suggest something. this site http://www.efmax.co.uk/box.htm gives a pretty good description on what is involved in designing the RIGHT box with the right subwoofer and is FULL of graphs. however, it leaves much to be desired. I think that if you can stretch this short tutorial into ten times its size, than it would be the most complete ground up tutorial on speaker enclosure design i have ever seen. explain terminology and concepts pretty much from the ground up and i think you can something incredible work. fully understanding ported enclosures is a good start for any audiophile...
Erskine's a good guy, I've been round to his place to learn how to desing bandpass boxes which is quite interesting.
I may try to do some sort of tutorial over Xmas if I can find the time.
-------------------- *hmm need to think of a new sig*
quote:Originally posted by bullseye17: uhhh heh with those 15s and those amps you wont need to worry where you put em i just finished a 3/4 10 cube ported wall, with the same subs and amps and can you say SICKKKKKKK.... i cant even sit in the car
Hey, how do those subs handle the power? I don't want to have to ship them back after about a week of bumpin. If the DVC's don't work, I can always just run SVC's with 1 mtx 8100d. Do you work at CC?
-------------------- Infiniti Qx4: Pioneer P930 H/U, Epic150, MTX8100d, 2 Alpine TypeR 12 SVC's with 1.28cuft tuned to 31hz, JL XR6.5 components (JL 300/4)/VR6 Coaxials (Other half of 300/4) F/R, 1 Farad Stinger HPM Cap, 2 Optima Red-Tops (Soon to be 3), 0/1 Gauge Stinger Wire, All Stinger HPM Fuses and Fuseholders, Cold Air Intake, HKSuv Sport Exhaust, Ignition System
quote:Originally posted by Beebs: Ok, here's the deal. I am a junior in highschool and there is a science fair in my town coming up in the spring. I want to do a project based on gaining the highest spl in my truck. I know it sounds corny, but it is not just going to be a simple project. I was thinking of proving ideas and concepts using some cool research tools and getting some good graphs of in-box impedance rises, box placement, transfer functions, and other stuff like that. Anyone have any ideas on where to start? I really want to get some good props for car audio and try to show the usefulness of the sport and hopefully get some help from some of the record holders to draw some attention to the sport. Maybe I could get some pictures of the Beast and Mike's van to gain people's interest. I hope that I don't get some closed-minded judge like officer doofy off that TLC show judging my project.
Any suggestions on sites that have technical information? I need equations or charts so I can get an idea of what I need to test.
[ 11-26-2001: Message edited by: Beebs ]
Before anybody can help you, and believe me, you can learn a lot from the people here, you need to tell us what your possibilities are. How big of a box? How much power? What kind of truck? There are a lot of trade offs with different setups. You can learn a lot from software, but it will not really work in your car. Tell us what direction you want to go, then we can tell you more from there.
Posts: 1259 | From: Fullerton. CA ,USA | Registered: Oct 1999
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-------------------- there is no use to get pigs to fly if they have to roast on telephone wires Posts: 16 | From: Australia 5006 | Registered: Sep 1999
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posted
Ok, here's the deal. I ordered my subs and amps yesterday (alpine type-r 15's and two mtx 8100d's) and I am getting my wiring put in some time after christmas (0/1 gauge, breakers, two more red-tops). I have an infiniti qx4, which is the same as a nissan pathfinder. I don't want to do a wall, and I have about 7 cubes to work with without the box going up to the rear windows(ss1-2 nw). I can make a box the will go bigger, but I would have to fold down my back seats. Right now, my subs get loudest at 47hz in a sealed box (1.25ft^3 for each driver) with the windows up. I hope I got it all.
[ 12-13-2001: Message edited by: Beebs ]
-------------------- Infiniti Qx4: Pioneer P930 H/U, Epic150, MTX8100d, 2 Alpine TypeR 12 SVC's with 1.28cuft tuned to 31hz, JL XR6.5 components (JL 300/4)/VR6 Coaxials (Other half of 300/4) F/R, 1 Farad Stinger HPM Cap, 2 Optima Red-Tops (Soon to be 3), 0/1 Gauge Stinger Wire, All Stinger HPM Fuses and Fuseholders, Cold Air Intake, HKSuv Sport Exhaust, Ignition System
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