Krakin Posted March 27, 2015 Report Share Posted March 27, 2015 If you're interested in acoustics, you should be if you are in a hobby of sound, I suggest looking for some books on the subject. I have a list somewhere on here of some of the places I've used that I'll try to find and link you to. Krakin's Home Dipole Project http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370 Krakin, are you some sort of mad scientist? I would have replied earlier, but I was measuring the output of my amp with a yardstick . . . What you hear is not the air pressure variation in itself but what has drawn your attention in the two streams of superimposed air pressure variations at your eardrums An acoustic event has dimensions of Time, Tone, Loudness and Space Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears, thus no formula can achieve a definite effect for every listener. Link to comment Share on other sites More sharing options...
Krakin Posted March 27, 2015 Report Share Posted March 27, 2015 http://www.stevemeadedesigns.com/board/topic/195541-scooters-trying-to-boost-his-knowledge-trying-to-learn-some-ish-subwoofer-talk/#entry2933891 Krakin's Home Dipole Project http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370 Krakin, are you some sort of mad scientist? I would have replied earlier, but I was measuring the output of my amp with a yardstick . . . What you hear is not the air pressure variation in itself but what has drawn your attention in the two streams of superimposed air pressure variations at your eardrums An acoustic event has dimensions of Time, Tone, Loudness and Space Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears, thus no formula can achieve a definite effect for every listener. Link to comment Share on other sites More sharing options...
bigsausagepizza Posted March 27, 2015 Report Share Posted March 27, 2015 http://www.stevemeadedesigns.com/board/topic/195541-scooters-trying-to-boost-his-knowledge-trying-to-learn-some-ish-subwoofer-talk/#entry2933891 Krakin dropping some science like usual! Great links as always. 2008 Subaru WRX STI K&N Typhoon Intake Invidia Polished Stainless 3" turbo back with cat Cobb Accessport Dyno tune from Kaizen Tuning 320awhp 330ft-lb awtq MTX 421D Sub amp American Bass SQ900 Highs/Mids amp Sundown Audio SD-2 10 D4 JL Audio XR653-CS 3-way Components 3sixty.2 Second Skin Damplifier Pro Custom fiberglass wheel well enclosure Transmission Line quasi-floor enclosure http://www.stevemeadedesigns.com/board/forum/13-member-rides-builds-show-off-your-whip-show-off-your-system/ Bill Fitzmaurice TLAH line-array hifi towers 9 Goldwood 4" mids (each) 12 Goldwood 1/2" tweeters (each) NAD 1020 Preamp MiniDSP 2x4 Balanced processor Thorens TD166mkII Turntable Hafler DH-200 Amplifier http://www.stevemeadedesigns.com/board/topic/192638-line-array-hifi-tower-build/ https://www.facebook.com/HolyMountainGlass Link to comment Share on other sites More sharing options...
sirhutson Posted March 27, 2015 Report Share Posted March 27, 2015 What are your goals in this build? If you are just wanting to sound good, then you really dont need to goto the extent of all that. But if you are trying to hit the highest numbers possible with what you have, then lets get started. ...what are you talking about? Don't give out bad advice if you don't know what you are talking about. Has nothing to do with hitting the highest numbers... OP it depends on your car and setup. When I say setup I mean the type of enclosure you are going to build. If you are building a vented enclosure I think box dimensions and port size/shape are more important than in a sealed enclosure. It is critical that you design a enclosure correctly when it comes to a vented enclosure, a sealed enclosure is more forgiving but often times does not yield the same type of bass characteristics. In a vented enclosure you have to "tune" the port to make sure you do not "unload" the subs, ie play them lower then their resonant frequency which would cause driver failure is done often or at certain power levels. A sealed enclosure does not have this characteristic and the cone is supported by air that is being moved by the cone so often times the only concern is that you size ir appropriately so that the sub can "breathe". I would recommend you go over to the basic car audio electronics website and read up a bit on enclosures and how to calculate different types. Not sure what the optimal type of enclosure for a VFL sub would be but my guess is that vented is going to be your best bet. Talk to your American Bass dealer because I bet they have a standard type enclosure that they recommend and would be tailored to their product that you could build. Theres also the torres calculator or worksheet, just search this forum for it which will help you get a cut list. Also JoeX sometimes will do designs for folks as well that could be a good resource. A well made box is going to take you a lot more then a couple of days but I guess that depends on the design, the more simple you go the faster it will be to fabricate. Also there a ton of people on here that build subwoofer enclosures and can help you. Ask around and PM them about prices. Most are extremely reasonable. Depending on the complexity, a simple enclosure is going to run you about $200 is someone else does it and thats on the extreme low end for one that is done right. I interpret the OP as asking how to figure out the acoustics of his car, not the acoustics of an enclosure. In which case the guy above is asking a very relevant question. really? well if thats the case then my bad. I am not saying asking what the goal is, is a bad question thats the first step. But everything in the post seemed to point to the box. When I think acousitics in a car I think the only way to "tune" it would be to deaden it really and measure that. Other than that you are going to be measuring reflections and possibly cancellation but thats it. It's all good man, I'm just saying my guess is sirhutson isn't giving bad advice, but possibly answering a different question than you. I re-read the OP and now I am even more confused to what he is actually asking. Yes, I am just asking what he is trying to accomplish. Not trying to give out bad advice. I wasnt sure if he was trying to build on a competition level or just build something thats easy and also sounds good. boss 1200 and a ipod nano. Link to comment Share on other sites More sharing options...
Krakin Posted March 27, 2015 Report Share Posted March 27, 2015 You need to worry about acoustics no matter the level of experience or what the end goal is. If you do some very simple things it makes so many things go either go away or so much simpler to deal with. The most basic way to mess with acoustics is to literally just change the position of your speakers and listen to it. Krakin's Home Dipole Project http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370 Krakin, are you some sort of mad scientist? I would have replied earlier, but I was measuring the output of my amp with a yardstick . . . What you hear is not the air pressure variation in itself but what has drawn your attention in the two streams of superimposed air pressure variations at your eardrums An acoustic event has dimensions of Time, Tone, Loudness and Space Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears, thus no formula can achieve a definite effect for every listener. Link to comment Share on other sites More sharing options...
Richard Ramkellawan Posted March 27, 2015 Author Report Share Posted March 27, 2015 also you posted in the wrong section, head over the subwoofer/enclosure section. What are your goals in this build? If you are just wanting to sound good, then you really dont need to goto the extent of all that. But if you are trying to hit the highest numbers possible with what you have, then lets get started. ok ,first off i am from trinidad ,west indies....yes it will be a light competing vehicle,its not a spl ,its a loudness 4-12" {with mids box outside} how we do it in trinidad.....so i want my bass to hit as hard as possible out side the vehicle Link to comment Share on other sites More sharing options...
Richard Ramkellawan Posted March 27, 2015 Author Report Share Posted March 27, 2015 hi guys,im new to this,i am building a subwoofer box in my van for 4- 12" american bass xd....my friend told me that before i build the box ,i need to measure the inside off the vehicle to find out the acoustics and ,how to tune my box.....is this true? if so, how do i go about in doing this ,is there a calculator or formula for doing this?, please guys help me,im trying to get this done in a few days,so anyone who can help,please do ,thanks...... here is a little list off my system ,each sub rated at 500rms @ dual 4...........4 subs -2000rms i will be giving the subs 3400 rms {soundstream tower 3400 @ .5.......i am looking for a hard bass 40-50 hz ,but can also play a little rap { rick ross } Link to comment Share on other sites More sharing options...
Richard Ramkellawan Posted March 27, 2015 Author Report Share Posted March 27, 2015 hi guys,im new to this,i am building a subwoofer box in my van for 4- 12" american bass xd....my friend told me that before i build the box ,i need to measure the inside off the vehicle to find out the acoustics and ,how to tune my box.....is this true? if so, how do i go about in doing this ,is there a calculator or formula for doing this?, please guys help me,im trying to get this done in a few days,so anyone who can help,please do ,thanks...... or also i would be building a slot port ....... Link to comment Share on other sites More sharing options...
Richard Ramkellawan Posted March 27, 2015 Author Report Share Posted March 27, 2015 What are your goals in this build? If you are just wanting to sound good, then you really dont need to goto the extent of all that. But if you are trying to hit the highest numbers possible with what you have, then lets get started. ...what are you talking about? Don't give out bad advice if you don't know what you are talking about. Has nothing to do with hitting the highest numbers... OP it depends on your car and setup. When I say setup I mean the type of enclosure you are going to build. If you are building a vented enclosure I think box dimensions and port size/shape are more important than in a sealed enclosure. It is critical that you design a enclosure correctly when it comes to a vented enclosure, a sealed enclosure is more forgiving but often times does not yield the same type of bass characteristics. In a vented enclosure you have to "tune" the port to make sure you do not "unload" the subs, ie play them lower then their resonant frequency which would cause driver failure is done often or at certain power levels. A sealed enclosure does not have this characteristic and the cone is supported by air that is being moved by the cone so often times the only concern is that you size ir appropriately so that the sub can "breathe". I would recommend you go over to the basic car audio electronics website and read up a bit on enclosures and how to calculate different types. Not sure what the optimal type of enclosure for a VFL sub would be but my guess is that vented is going to be your best bet. Talk to your American Bass dealer because I bet they have a standard type enclosure that they recommend and would be tailored to their product that you could build. Theres also the torres calculator or worksheet, just search this forum for it which will help you get a cut list. Also JoeX sometimes will do designs for folks as well that could be a good resource. A well made box is going to take you a lot more then a couple of days but I guess that depends on the design, the more simple you go the faster it will be to fabricate. Also there a ton of people on here that build subwoofer enclosures and can help you. Ask around and PM them about prices. Most are extremely reasonable. Depending on the complexity, a simple enclosure is going to run you about $200 is someone else does it and thats on the extreme low end for one that is done right. I interpret the OP as asking how to figure out the acoustics of his car, not the acoustics of an enclosure. In which case the guy above is asking a very relevant question. really? well if thats the case then my bad. I am not saying asking what the goal is, is a bad question thats the first step. But everything in the post seemed to point to the box. When I think acousitics in a car I think the only way to "tune" it would be to deaden it really and measure that. Other than that you are going to be measuring reflections and possibly cancellation but thats it. It's all good man, I'm just saying my guess is sirhutson isn't giving bad advice, but possibly answering a different question than you. I re-read the OP and now I am even more confused to what he is actually asking. Yes, I am just asking what he is trying to accomplish. Not trying to give out bad advice. I wasnt sure if he was trying to build on a competition level or just build something thats easy and also sounds good. ok ,first off i am from trinidad ,west indies....yes it will be a light competing vehicle,its not a spl ,its a loudness 4-12" {with mids box outside} how we do it in trinidad.....so i want my bass to hit as hard as possible out side the vehicle Link to comment Share on other sites More sharing options...
Richard Ramkellawan Posted March 27, 2015 Author Report Share Posted March 27, 2015 What are your goals in this build? If you are just wanting to sound good, then you really dont need to goto the extent of all that. But if you are trying to hit the highest numbers possible with what you have, then lets get started. ...what are you talking about? Don't give out bad advice if you don't know what you are talking about. Has nothing to do with hitting the highest numbers... OP it depends on your car and setup. When I say setup I mean the type of enclosure you are going to build. If you are building a vented enclosure I think box dimensions and port size/shape are more important than in a sealed enclosure. It is critical that you design a enclosure correctly when it comes to a vented enclosure, a sealed enclosure is more forgiving but often times does not yield the same type of bass characteristics. In a vented enclosure you have to "tune" the port to make sure you do not "unload" the subs, ie play them lower then their resonant frequency which would cause driver failure is done often or at certain power levels. A sealed enclosure does not have this characteristic and the cone is supported by air that is being moved by the cone so often times the only concern is that you size ir appropriately so that the sub can "breathe". I would recommend you go over to the basic car audio electronics website and read up a bit on enclosures and how to calculate different types. Not sure what the optimal type of enclosure for a VFL sub would be but my guess is that vented is going to be your best bet. Talk to your American Bass dealer because I bet they have a standard type enclosure that they recommend and would be tailored to their product that you could build. Theres also the torres calculator or worksheet, just search this forum for it which will help you get a cut list. Also JoeX sometimes will do designs for folks as well that could be a good resource. A well made box is going to take you a lot more then a couple of days but I guess that depends on the design, the more simple you go the faster it will be to fabricate. Also there a ton of people on here that build subwoofer enclosures and can help you. Ask around and PM them about prices. Most are extremely reasonable. Depending on the complexity, a simple enclosure is going to run you about $200 is someone else does it and thats on the extreme low end for one that is done right. I interpret the OP as asking how to figure out the acoustics of his car, not the acoustics of an enclosure. In which case the guy above is asking a very relevant question. really? well if thats the case then my bad. I am not saying asking what the goal is, is a bad question thats the first step. But everything in the post seemed to point to the box. When I think acousitics in a car I think the only way to "tune" it would be to deaden it really and measure that. Other than that you are going to be measuring reflections and possibly cancellation but thats it. measuring reflections and possibly cancellation , yes something like that.... Link to comment Share on other sites More sharing options...
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