Sub Angle in a 2000 Tib
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Adding a little more clearification here, the picture in number one would more so represent something in the higher frequency range such as a tweeter and it is unidirectional and in tweeters it DOES matter. Once you get into subs it does not make quite as much difference in hearing them but like Dan said, you will DEFINITELY be able to feel the difference.
I might be a little off here but I am thinking that a 40Hz note takes around 30 feet to completly form. Think of this as a wave in the ocean. A wave starts at a flat point rises all the way up to the peak the all the way down to it's trough or bottom then back to flat. That is equivilent to one "cycle" of the waves. Sound waves work the same way. So in that respect for a 40Hz note to make one full cycle, it takes around 30ft. That is why a sub will sound better or worse when the box is fired into different directions.
As for band pass boxes you would do the same with the port, aiming wise, considering it is a fourth order box.
Here is a break down of orders:
1st order - free air or baffle board
2nd order - sealed box
3rd order - ported box
4th order - sealed chamber firing into a
ported chamber, sub in between.
5th order - same as 4th with some type of
equalization
6th order - ported chamber firing into a
ported chamber
7th order - same as 7th with some type of
equalization
There are other types as well but I am not going to go into those right now.
As for you 3rd picture that is called (3rd order or ported) iso baric loading and one of the subs would be wired out of phase. Basically the enclosure size can be reduced by half but it is less efficeint than a stand alone sub.
Also if anyone is interested in some pics, I went to the IASCA World Finals this past weekend and I have around 50 - 60 pics of some cars. I also heard the World SPL record holding vehicle. It belongs to Alma Gates and hits in the neighborhood of 179db. eek.gif eek.gif Need less to say, LOUD!!!
Jaws, if you see anything I missed or need correction on feel free.
[ October 26, 2001: Message edited by: Tunez ]
I might be a little off here but I am thinking that a 40Hz note takes around 30 feet to completly form. Think of this as a wave in the ocean. A wave starts at a flat point rises all the way up to the peak the all the way down to it's trough or bottom then back to flat. That is equivilent to one "cycle" of the waves. Sound waves work the same way. So in that respect for a 40Hz note to make one full cycle, it takes around 30ft. That is why a sub will sound better or worse when the box is fired into different directions.
As for band pass boxes you would do the same with the port, aiming wise, considering it is a fourth order box.
Here is a break down of orders:
1st order - free air or baffle board
2nd order - sealed box
3rd order - ported box
4th order - sealed chamber firing into a
ported chamber, sub in between.
5th order - same as 4th with some type of
equalization
6th order - ported chamber firing into a
ported chamber
7th order - same as 7th with some type of
equalization
There are other types as well but I am not going to go into those right now.
As for you 3rd picture that is called (3rd order or ported) iso baric loading and one of the subs would be wired out of phase. Basically the enclosure size can be reduced by half but it is less efficeint than a stand alone sub.
Also if anyone is interested in some pics, I went to the IASCA World Finals this past weekend and I have around 50 - 60 pics of some cars. I also heard the World SPL record holding vehicle. It belongs to Alma Gates and hits in the neighborhood of 179db. eek.gif eek.gif Need less to say, LOUD!!!
Jaws, if you see anything I missed or need correction on feel free.
[ October 26, 2001: Message edited by: Tunez ]
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Tunez, pretty good no correction needed. But I will now try to simplify this even more (maybe a bad move on my part). A sub makes a wave larger than say a 6 1/2, 6x9 etc.. to put it into a visual think of a chick with a size D chest now take a couple of her bras and put them side by side one right side up and one upside down and up and then down no take this as a size of a bass wave. Now right below take a girls bra that has an A size chest and repeat the same thing with her bras this represents the wave of a 6x9, 6 1/2 etc...As you can see the D's are bigger than the A's.being the A wave is smaller it will get to your ear first because it takes less time for the frequency to travel and form. By positioning the subs to the back it gives the wave more room to produce the sound wave and make the sound more efficent.but keep in mind the bigger the sub the longer it takes the sound wave to produce. As far as your interior speakers you can fake your hearing to beleive it is all coming from the center of the car by angleing the speakers in you car but that is another story I will explain if you want me too. As far as poly fill goes what everyone said is correct it is used to correct the internal volume of the box but what is left out is that if poly fill is needed the box is not built to spec for your subs and you don't want to try to correct it by filling it up with poly fill. Yes it could make it sound better if you just buy any run of the mill box to put your subs in but it might also hurt the sound. The best thing you can do to make the box not to sound hollow inside is to first caulk all the joints and then dynomat the whole interior of the box. This will seal any air leaks in the box that you might have and give the inside some more stability. What do think Tunez did I make it better or worse lol.
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From: Texas
Vehicle: Custom Wagon
Hey guys I think in so ways you miss understood what I was saying. I know what the poly fill is for and the basic setup stuff. I was asking more to Heliosdesign. Since he said that aiming speakers didn't make a difference.
I know what the poly fill is for and the basic setup stuff. I was asking more to Heliosdesign. Since he said that aiming speakers didn't make a difference.
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YEAH BABY!!! . But on a serious note it does make a difference how you angle your subs, Angle them to the back of the car if the box is to big aim them towards the roof this will give the bass wave more time to mature you could face it to the front it will still sound good but not as strong as the other two ways the first (to the back) being the better of the three.
. But on a serious note it does make a difference how you angle your subs, Angle them to the back of the car if the box is to big aim them towards the roof this will give the bass wave more time to mature you could face it to the front it will still sound good but not as strong as the other two ways the first (to the back) being the better of the three.
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Joined: Oct 2001
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From: Nashua, NH
Vehicle: 01 Tiburon
Hi there...new member...
I dunno if this helps (and i'm not an expert techie on sound dynamics) but I've got a boomin system runnin in my tib. Full amp supply to all 8 speakers, including cap. I started out with a sealed box for my two 10" polk audios, but then upgraded to a ported box, and it's like night and day. That extra air allows for a lot of sound and power to go thru--the kind that makes your seat and hair vibrate. I think placement does make a difference. Subs do need to bounce off things. Proof? Just open the trunk and crank it versus it closed. And I've noticed more UMPH when the subs are facing the rear.
Not an expert, but hope that helps. Sounds awesome in my car.
-the Richman
I am gonna be building a box for 3 12in. Autotek subs this winter, and wondering whether I should have them face out or up. I currently have 2 now facing upwards. THey sound pretty good, but I am lookin for optimum sound (BASS). Any suggestions would be greatly appreciated.[/QB][/QUOTE]
I dunno if this helps (and i'm not an expert techie on sound dynamics) but I've got a boomin system runnin in my tib. Full amp supply to all 8 speakers, including cap. I started out with a sealed box for my two 10" polk audios, but then upgraded to a ported box, and it's like night and day. That extra air allows for a lot of sound and power to go thru--the kind that makes your seat and hair vibrate. I think placement does make a difference. Subs do need to bounce off things. Proof? Just open the trunk and crank it versus it closed. And I've noticed more UMPH when the subs are facing the rear.
Not an expert, but hope that helps. Sounds awesome in my car.
-the Richman
I am gonna be building a box for 3 12in. Autotek subs this winter, and wondering whether I should have them face out or up. I currently have 2 now facing upwards. THey sound pretty good, but I am lookin for optimum sound (BASS). Any suggestions would be greatly appreciated.[/QB][/QUOTE]
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Thanks you guys! You all reconfirmed what I thought all along. As for deck and amp, I have a Clarion Pro Audio Z series with the 6 disk changer, and a Kicker Impulse 230.2 2 channel amp, max power of 1500 watts, but having 2 ohm subs, I cant take advantage of that power.
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Basicly you want to keep from causing Phase cancellation in your sound waves.
if your are going to point them back you need to keep them close to the back as possible.
sound waves travel in all directions from a subwoofer.
the farther they are away from the rear of the vehicle the more phase cancellation you will get.
if you want to point the subs forward, you almost have to put a wall in your vehicle to make it sound right.
the sound waves will travel forward and back from the subs, when the sound wave bouncing off the rear of the vehicle catches up to the sound wave traveling forward, you want them to be as close in phase as possible.
I hope this makes some sense?
smile.gif
if your are going to point them back you need to keep them close to the back as possible.
sound waves travel in all directions from a subwoofer.
the farther they are away from the rear of the vehicle the more phase cancellation you will get.
if you want to point the subs forward, you almost have to put a wall in your vehicle to make it sound right.
the sound waves will travel forward and back from the subs, when the sound wave bouncing off the rear of the vehicle catches up to the sound wave traveling forward, you want them to be as close in phase as possible.
I hope this makes some sense?
smile.gif