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View Full Version : Audioque and RE box calculator QUESTIONS



Bass911
12-13-2009, 08:07 PM
I fully understand how Audioque wants their boxes designed. What I don't understand is when you input these figures in the RE box calculator the box is tuned to 32-33Hz? I know this calculator is pretty accurate from experience. You can input most manufacturers specs in that calculator, and most are dead on or only off by 1-3Hz for the tuning. Audioque says the box will be at 40Hz, RE says 33Hz. Maybe this is why people think AQ hits the lows so hard or maybe this calculator is no good for AQ subs? I'm making one for 2 Sdc2.515's. The box I'm going with is 8.5cu ft. and 136 sq. port area. Can anyone help me out?

deathpenalty18
12-13-2009, 08:13 PM
u can tuned it to 33hz it will hit low. mine is tuned to 34 and its perfect! but i wouldnt tuned to 40hz unless ur doing mostly comps and barley daily. i would prob tuned this somewhere inbetween 35-37 hz

fasfocus00
12-13-2009, 08:19 PM
i've built boxes for AQ subs tuned to ~38hz and they hit low and hard as well as building boxes for other brands and keeping tuning to ~34hz with similar results. I have found that the RE calculator is slightly off by like ~2hz especially and even more for most others b/c those ppl don't take into the account sub displacement which will raise your tuning another 1-2hz depending on subs.

Bass911
12-13-2009, 08:20 PM
u can tuned it to 33hz it will hit low. mine is tuned to 34 and its perfect! but i wouldnt tuned to 40hz unless ur doing mostly comps and barley daily. i would prob tuned this somewhere inbetween 35-37 hz

I know I could tune lower, but I don't believe that RE calculator is off by that much. If I tune lower and put those specs in, the box will tuned to 27Hz with the RE box calculator. What box program do you use?

Bass911
12-13-2009, 08:24 PM
i've built boxes for AQ subs tuned to ~38hz and they hit low and hard as well as building boxes for other brands and keeping tuning to ~34hz with similar results. I have found that the RE calculator is slightly off by like ~2hz especially and even more for most others b/c those ppl don't take into the account sub displacement which will raise your tuning another 1-2hz depending on subs.

But do you fully understand what I am saying? Audioque says the box is tuned to 40Hz, but when you put in in the RE box calculator it shows it to be tuned to 33Hz. I don't feel right making this box if I don't know what it is exactly tuned too?

deathpenalty18
12-13-2009, 08:25 PM
I know I could tune lower, but I don't believe that RE calculator is off by that much. If I tune lower and put those specs in, the box will tuned to 27Hz with the RE box calculator. What box program do you use?

i use re calculator too seems to work fine . just of buy 1-2hz. dont make the box tuned to 27 thats way to low bring it up to 30 at the very lowest if u wanna hit the lows and be loude as **** then tune it to 32 hz

Bass911
12-13-2009, 08:36 PM
i use re calculator too seems to work fine . just of buy 1-2hz. dont make the box tuned to 27 thats way to low bring it up to 30 at the very lowest if u wanna hit the lows and be loude as **** then tune it to 32 hz

But it's off by 7Hz if you make the box like Audioque wants it made.

fasfocus00
12-13-2009, 08:38 PM
But do you fully understand what I am saying? Audioque says the box is tuned to 40Hz, but when you put in in the RE box calculator it shows it to be tuned to 33Hz. I don't feel right making this box if I don't know what it is exactly tuned too?

maybe you don't fully understand. if the RE calculator is off by 1-2hz and it says it's tuned to 32hz that puts it's actual tuning to 34hz and you are not accounting for the displacement of the sub that will increase your tuning ~2hz to around 36hz. honestly you are making wayyy to big of a deal about the tuning frequency. if you're off by a couple hz it's fine and you will not be able to hear the difference as the ear cannot distinguish direction or tone of sounds below 100hz. when you're off by 8-10hz than you'll notice subtle differences but nothing too major unless it's from 40hz-50hz or 50hz to 60hz.

SicAudio
12-13-2009, 08:43 PM
and everyone thinks i am nuts for saying re calc is off for anything but re subs lol. Even Greg at RE will tell u it was designed for RE subs specifically so you need to account for that or use BBP 6

Bass911
12-13-2009, 09:18 PM
maybe you don't fully understand. if the RE calculator is off by 1-2hz and it says it's tuned to 32hz that puts it's actual tuning to 34hz and you are not accounting for the displacement of the sub that will increase your tuning ~2hz to around 36hz. honestly you are making wayyy to big of a deal about the tuning frequency. if you're off by a couple hz it's fine and you will not be able to hear the difference as the ear cannot distinguish direction or tone of sounds below 100hz. when you're off by 8-10hz than you'll notice subtle differences but nothing too major unless it's from 40hz-50hz or 50hz to 60hz.

I'm not making a big deal! I'm talking about a 7Hz difference. I've never cared about a 2hz difference, and according to Dj the displacement was already figured in there. I can build it just like AQ wants, but it seems like its not the tuning they say?

bromo
12-13-2009, 09:57 PM
What are the dimensions of the box?

bromo
12-13-2009, 09:58 PM
and everyone thinks i am nuts for saying re calc is off for anything but re subs lol. Even Greg at RE will tell u it was designed for RE subs specifically so you need to account for that or use BBP 6

I fail to see how the calculator can tell the difference between a re sub and a different manufactures sub.

d-REW
12-13-2009, 10:06 PM
just build like dj said and will be fine he uses a diiferant cal and i trusted his more then re's and my box turned out good.

Bass911
12-13-2009, 10:12 PM
What are the dimensions of the box?

I can tell you, but it doesn't matter what Aq box you put in that calculator. It will be off by 6-7hz. AQ says to multiply your cubic feet of what you want the box to be by 16, and that gives you the port area. Go to the calculator and you'll see. 8.5cu ft. x 16 = 136sq port area. Put these numbers in from top to bottom in the red fields.

49
18
25.5
25.5
0.75
8.25
0

You'll end up with 8.5cu ft. and 136 of port area. The calculator will give you all the dimensions at the bottom. Can you find my mistake?

Bass911
12-13-2009, 10:19 PM
just build like dj said and will be fine he uses a diiferant cal and i trusted his more then re's and my box turned out good.

That's what I'll do, but I've built more boxes using the RE box calculator. Some tuned high and some tuned low and they turned out pretty good. I just noticed this for the first time with this AQ build. The rest were only off by 1-2hz.

d-REW
12-13-2009, 10:21 PM
yeah i has same prob when he gave me my measurements but it worked out fine.

bromo
12-13-2009, 10:27 PM
I can tell you, but it doesn't matter what Aq box you put in that calculator. It will be off by 6-7hz. AQ says to multiply your cubic feet of what you want the box to be by 16, and that gives you the port area. Go to the calculator and you'll see. 8.5cu ft. x 16 = 136sq port area. Put these numbers in from top to bottom in the red fields.

49
18
25.5
25.5
0.75
8.25
0

You'll end up with 8.5cu ft. and 136 of port area. The calculator will give you all the dimensions at the bottom. Can you find my mistake?


There is no mistake the calc is wrong but not as much as you think. From my calculations I came up with 8.82ft^3 @ 32.5 Hz before sub displacement.

Bass911
12-13-2009, 10:31 PM
There is no mistake the calc is wrong but not as much as you think. From my calculations I came up with 8.82ft^3 @ 32.5 Hz before sub displacement.

Yeah, but are AQ subs supposed to be tuned that low? I thought they needed higher tuning?

SicAudio
12-13-2009, 10:41 PM
I fail to see how the calculator can tell the difference between a re sub and a different manufactures sub.

because when Greg did the Calculator he adjusted the parameters to accomadate an RE sub not an AQ sub or any other sub. call and ask him yourself.

Bass911
12-13-2009, 10:45 PM
because when Greg did the Calculator he adjusted the parameters to accomadate an RE sub not an AQ sub or any other sub. call and ask him yourself.

No need to call! I believe you that's why I'll just do it like Dj said.

fasfocus00
12-13-2009, 10:46 PM
I can tell you, but it doesn't matter what Aq box you put in that calculator. It will be off by 6-7hz. AQ says to multiply your cubic feet of what you want the box to be by 16, and that gives you the port area. Go to the calculator and you'll see. 8.5cu ft. x 16 = 136sq port area. Put these numbers in from top to bottom in the red fields.

49
18
25.5
25.5
0.75
8.25
0

You'll end up with 8.5cu ft. and 136 of port area. The calculator will give you all the dimensions at the bottom. Can you find my mistake?

alright based on what you gave, according to RE you're at 8.545 cubes tuned to 33hz without sub displacement. I am using my calculator for this and am coming up with 9.597 cubes tuned to ~37hz before sub displacement. don't know what the deal is with the net displacement but as stated the tuning frequency is off by a few.

SicAudio
12-13-2009, 10:52 PM
yeah DJ is a great guy he knows better than anyone so you are in good hands :)

nice workup fasfocus it just further proves the point.

sub-FATHER
12-13-2009, 11:00 PM
http://www.mobileinformationlabs.com/HowTo-1Woofer-Box-CAL%20Port%20lenth%201.htm

http://www.the12volt.com/caraudio/boxcalcs.asp#por

try others and then see which ones are about the same and then decide.

SicAudio
12-13-2009, 11:05 PM
good idea tweeker ;)

bromo
12-13-2009, 11:25 PM
because when Greg did the Calculator he adjusted the parameters to accomadate an RE sub not an AQ sub or any other sub. call and ask him yourself.

of course he'll say that, why would he want you to use his calculator for other subs. Ive seen the same flash based calculator on other sites and it still had the same problems. He did nothing to the program.

bromo
12-13-2009, 11:27 PM
alright based on what you gave, according to RE you're at 8.545 cubes tuned to 33hz without sub displacement. I am using my calculator for this and am coming up with 9.597 cubes tuned to ~37hz before sub displacement. don't know what the deal is with the net displacement but as stated the tuning frequency is off by a few.

Better recalculate that.

Bass911
12-13-2009, 11:36 PM
How do I do the math for moving the port to the middle for a common chamber box?

fasfocus00
12-13-2009, 11:48 PM
Better recalculate that.

sure, why don't you do so as well b/c the box before any displacements is 10.89 cubes and the port displacement is ~1.6 cubes.
10.89
-1.60
=9.29 cubes

SicAudio
12-13-2009, 11:52 PM
you dont have tocalculate for where the port is just the port itself. posistion is pretty irrelevant.

bromo learn math or gtfo i do boxes for a living as well as alot of other **** and re calc is wrong period.

bromo
12-14-2009, 12:02 AM
you dont have tocalculate for where the port is just the port itself. posistion is pretty irrelevant.

bromo learn math or gtfo i do boxes for a living as well as alot of other **** and re calc is wrong period.

did you even do the math? doesnt sound like it or else you need learn basic math your self. I'm not doubting it is wrong.

Bass911
12-14-2009, 12:05 AM
you dont have tocalculate for where the port is just the port itself. posistion is pretty irrelevant.

bromo learn math or gtfo i do boxes for a living as well as alot of other **** and re calc is wrong period.

It will change the internal volume if I move the port to the middle instead of just keeping it on the left or right side? Something has to be adjusted because you're using 2 pieces of wood for the port instead of 1 piece?

fasfocus00
12-14-2009, 12:08 AM
It will change the internal volume if I move the port to the middle instead of just keeping it on the left or right side? Something has to be adjusted because you're using 2 pieces of wood for the port instead of 1 piece?

the actual port volume does not change and the displacement of a 3/4" piece of mdf that is 16.5" long is not significant enough to change your tuning freq by more than 1hz.

Bass911
12-14-2009, 12:15 AM
the actual port volume does not change and the displacement of a 3/4" piece of mdf that is 16.5" long is not significant enough to change your tuning freq by more than 1hz.

Are you telling me to move it to the middle by just throwing another piece mdf 16.5x16 and leaving the width the same?

SicAudio
12-14-2009, 12:16 AM
^^^
Exactly

and no bromo i did not do the math because i have more than 20 times already for other posts similar to this. even times to know that it is off on anything but RE subs.

fasfocus00
12-14-2009, 12:17 AM
Are you telling me to move it to the middle by just throwing another piece mdf 16.5x16 and leaving the width the same?

if you keep the port the same size with the same dimensions than yes that is exactly what I'm telling you. how else could this be accomplished?

SicAudio
12-14-2009, 12:18 AM
Are you telling me to move it to the middle by just throwing another piece mdf 16.5x16 and leaving the width the same?

it is only .114cf for that 16.5x16x .75 port piece

bromo
12-14-2009, 12:21 AM
What you guys are forgetting to do is account for the corner of the box as it becomes part of the port. Why don't you tell me the volume of this pic it is his dimensions all you have to do is multiply the area by internal height and you have internal volume.
http://i152.photobucket.com/albums/s193/bromojr/Forum%20Junk/CAARG.png

924 X 16.5 = 15246
15246 / 1728 = 8.822916667

Bass911
12-14-2009, 12:29 AM
if you keep the port the same size with the same dimensions than yes that is exactly what I'm telling you. how else could this be accomplished?

I know how to do it, but didn't know how much it would throw the tuning off? Aq says it will be at 40hz, but I'd rather it be 35hz. Adding that mdf will probably make it 41hz?

fasfocus00
12-14-2009, 12:30 AM
What you guys are forgetting to do is account for the corner of the box as it becomes part of the port. Why don't you tell me the volume of this pic it is his dimensions all you have to do is multiply the area by internal height and you have internal volume.
http://i152.photobucket.com/albums/s193/bromojr/Forum%20Junk/CAARG.png

924 X 16.5 = 15246
15246 / 1728 = 8.822916667

you just proved to the world that you don't know what you're talking about. so you telling me and this forum that the space behind the port is considered part of the port and should not be taken into account for the box's internal volume?

SicAudio
12-14-2009, 12:31 AM
you account for the port after gross volume. vb of a box is after port and subs not before. so i didnt "forget" anything at all and i think fasfocus already said the measurement dimensions, i didnt verify it because I know he has been around long enough to do the simpl math required. if you want me to really do that i would be happy to

fasfocus00
12-14-2009, 12:32 AM
I know how to do it, but didn't know how much it would throw the tuning off? Aq says it will be at 40hz, but I'd rather it be 35hz. Adding that mdf will probably make it 41hz?

okay, so we can get this thread finished. your max dimension are 18" tall, 49" width, 25.5" depth and you want to tuning around 38-40hz. where do you want your subs and port placed?

Bass911
12-14-2009, 12:34 AM
What you guys are forgetting to do is account for the corner of the box as it becomes part of the port. Why don't you tell me the volume of this pic it is his dimensions all you have to do is multiply the area by internal height and you have internal volume.
http://i152.photobucket.com/albums/s193/bromojr/Forum%20Junk/CAARG.png

924 X 16.5 = 15246
15246 / 1728 = 8.822916667

You might as well finish what you started and visually move it to the middle for me?:D

SicAudio
12-14-2009, 12:35 AM
I facepalmed and peed my pants i laughed so hard at Bromo and his "NEW IMPROVED BOX MATH" lulz.

Bass911
12-14-2009, 12:36 AM
okay, so we can get this thread finished. your max dimension are 18" tall, 49" width, 25.5" depth and you want to tuning around 38-40hz. where do you want your subs and port placed?

Subs and port back, common chamber with port in the middle because it will help brace the box little better with the port in the middle.

fasfocus00
12-14-2009, 12:38 AM
Subs and port back, common chamber with port in the middle because it will help brace the box little better with the port in the middle.

what subs you running?

Bass911
12-14-2009, 12:38 AM
I facepalmed and peed my pants i laughed so hard at Bromo and his "NEW IMPROVED BOX MATH" lulz.

What's exactly is wrong about his math?

SicAudio
12-14-2009, 12:39 AM
You might as well finish what you started and visually move it to the middle for me?:D

lol you sure you want that idiot to do it? lol
fas will hook u up dude hes got it in the bag ;)

Bass911
12-14-2009, 12:40 AM
what subs you running?

2 Sdc2.515's

SicAudio
12-14-2009, 12:41 AM
What's exactly is wrong about his math?

he is saying the space at the end of the port is not part of the vb of the box and that it is part of the port which on a box that size will throw the tuning way way way off.

bromo
12-14-2009, 12:43 AM
you just proved to the world that you don't know what you're talking about. so you telling me and this forum that the space behind the port is considered part of the port and should not be taken into account for the box's internal volume?


I facepalmed and peed my pants i laughed so hard at Bromo and his "NEW IMPROVED BOX MATH" lulz.

So when you guys do designs and the port bends around the corners you still add the corners volume into the total box volume. Interesting.

SicAudio
12-14-2009, 12:45 AM
his port doesnt bend idiot you stop calculating port at the end of the port.

SicAudio
12-14-2009, 12:47 AM
the port just happens to be 8.25 from the back wall becuz u have to keep it the same distance from a wall as the width is, as a minimum which happens to be 8.25 even if the port is round it is the same thing a 4" port should be no closer than 4" to any wall of the box or it affects the tuning.

fasfocus00
12-14-2009, 12:49 AM
box: 18Hx49Wx24D
port: 16.5Hx7.5Wx18D

that puts your box at ~8.58 cubes net tuned to ~39hz after all displacements.

Bass911
12-14-2009, 01:07 AM
box: 18Hx49Wx24D
port: 16.5Hx7.5Wx18D

that puts your box at ~8.58 cubes net tuned to ~39hz after all displacements.

Like this? Do you think it should be tuned a little lower?

http://i425.photobucket.com/albums/pp337/jirving88/100_0604.jpg

bromo
12-14-2009, 01:52 AM
the port just happens to be 8.25 from the back wall becuz u have to keep it the same distance from a wall as the width is, as a minimum which happens to be 8.25 even if the port is round it is the same thing a 4" port should be no closer than 4" to any wall of the box or it affects the tuning.

That is not the same with this slot port, your using 3 of the boxes walls to make up the port. It carries around the corner in this instance. If it ended greater then 8.25" away from the back wall then you account for the corner in the volume.

fasfocus00
12-14-2009, 02:01 AM
Like this? Do you think it should be tuned a little lower?

http://i425.photobucket.com/albums/pp337/jirving88/100_0604.jpg

no, the dimensions I gave you are pretty much what DJ would recommend for you.

SicAudio
12-14-2009, 02:05 AM
That is not the same with this slot port, your using 3 of the boxes walls to make up the port. It carries around the corner in this instance. If it ended greater then 8.25" away from the back wall then you account for the corner in the volume.

then in that case the " corner " as you call it is still only .114cf less vb the wood is still only .75 thick lol making the "corner" 3/4" lol wow

you really need to read the cookbook just throw out everything you know about boxes and start all over. i plugged the dimensions into 3 dif calculators and bbp6 and fasfocus is dead on the money. you are taking the port wall thing way to literal in this case.

Bass911
12-14-2009, 10:03 AM
no, the dimensions I gave you are pretty much what DJ would recommend for you.

Are you saying no to my drawing or no to it shouldn't be tuned lower?

mazdakid
12-14-2009, 12:01 PM
I agree with bromo. It doesn't make sense to say the re calculator is off for all subs except for re subs. The numbers you put into that calc have nothing to do with any specs on the subs

mazdakid
12-14-2009, 12:05 PM
You don't get to pick what sub you're using on the re calculator, and all the re subs don't have the same specs so how can you say its wrong for other subs but not re subs?

mlstrass
12-14-2009, 12:33 PM
make the port 21" long if you want to tune to 35Hz, but 38Hz will be fine with those subs in 8.5cubes net. I've built a few just like that for the SDC's and they pound the lows...

Bass911
12-14-2009, 01:51 PM
make the port 21" long if you want to tune to 35Hz, but 38Hz will be fine with those subs in 8.5cubes net. I've built a few just like that for the SDC's and they pound the lows...

Check yo PM!

mlstrass
12-14-2009, 01:58 PM
pm answered...

fasfocus00
12-14-2009, 02:02 PM
Are you saying no to my drawing or no to it shouldn't be tuned lower?

no to being tuned lower

newdude
12-14-2009, 05:53 PM
fasfocus I must be using same calculator as you that is what I am coming up with

Blue Fury
12-16-2009, 12:22 AM
Sic, you really believe the RE calculator is designed JUST for RE subs because the guy said so?

Here: That guy obviously works with RE, so he knows what he's talking about. Thus, it must be true.

I am obviously myself, so I know what I'm talking about when I tell you about myself. I am 12 feet tall and weight 1000 lbs. Since I said that about me, it must be true to you.



See what I'm getting at? I want you to consider how it could be possible for this calculator to work only for RE subs. The only way is if there are factors included with every calculation. What could these factors be? Linear, logarithmic, or whatever, they would HAVE to influence the output of the sub. If they didn't, the calculator is wrong by percentage relating to each factor. If the factors do exist, they should be noted on the RE site with the description of each sub wouldn't they?

I really don't see how the calculator could only work for an RE sub. I need some convincing other than 'he said so' because I'll just tell you that I'm 12 feet tall again.

s_c
12-16-2009, 01:28 AM
alright based on what you gave, according to RE you're at 8.545 cubes tuned to 33hz without sub displacement. I am using my calculator for this and am coming up with 9.597 cubes tuned to ~37hz before sub displacement. don't know what the deal is with the net displacement but as stated the tuning frequency is off by a few.

check the math for the box he stated it's not 9.597 cuft more like 8.92cuft this is with port displacement and the point 42 will be made up with the subs displacement so the box volume is closer to 8.5 cuft

outside dimension 49x 25.5 x 18 minus 1.5 from all sides to get 47.5w x 16.5hx 24L. this is the inside dimension if using 3/4 inch stock
port 8.25w x16.5h x i used 21L inch long just a guesstimate before tuning 16.5x9.75x21 multiply those to gather then divided by 1728 to get 1.9555cuft minus this from the box of a 10.88cuft box yields 8.92 cuft you must be using the out side as the inside dimensions lmao.and it yielding a bigger box like 9.597


here is the math i use to figure ports just encase you want to check the other calculators out this one does not use t/s speaks to calculate box if this gives any one a hint


Ported boxes



Letters used in formulas as follows
Av or area of vent or Port area=pie time radius squared of a 3 inch port which =7 x1 or just 7 for this formula do not use round port of like 3 and 4 inch it will throw off formula use the pie time radius of port to get those by 1 inch
vb or volume of box =cubic inches for this formula has to be cubic inches can be gotten from width time height times length can divide this by 1728 to get cubic feet for manufacture specks
lv equal length of vent in inches
fb equals tuning frequency


We use the formula above like so we do this first and write it down av(1.84time ten to the eight power )then hit equals and write it down
Next we take vb(lv+.823squae root of av ) take those to answers after written down and divide by each other and add it in the square root of this part like so .159 square root of answer = tuning frequency
General rules to ported boxes
The port must not be a ratio greater then a 9:1 area
Must not use more then plus or minus 20%of manufacture specks for their boxes of what they perform best in.
The port must be measure down the center line and a correction factor of .5 time h must be added in the h is from hxwxL of a port
fomula for area lxhxw/1728

Blue Fury
12-16-2009, 03:24 PM
:wave:

Bass911
12-16-2009, 04:25 PM
Yall thought it was over? Do this math for common chamber with port in the middle? Straight port, no L.

Top&Bottom- 49 x 24
Back- 49 x 16.5
Port- 18.375 x 16.5(x2)
Left&Right sides- 22.5 x 16.5(x2)
Front- 20.375 x 16.5(x2)

s_c
12-16-2009, 09:56 PM
Yall thought it was over? Do this math for common chamber with port in the middle? Straight port, no L.

Top&Bottom- 49 x 24
Back- 49 x 16.5
Port- 18.375 x 16.5(x2)
Left&Right sides- 22.5 x 16.5(x2)
Front- 20.375 x 16.5(x2)

looks like 39.09 hertz to me. me my self does not like to tune high like in the 40+ region and that is very close to it. i like hitting the low notes in the 35 to about 18 hertz. i also do not use the extra volume for displacements some times you will get that one sub that just does not like the bigger boxes. put it this way you may have to rebuild if it sounds like cone fluttering crap cause you added in to much volume and a short port but this is how you got to learn it's trial and error to find out were you like it. if you need more help just say some thing.

Bass911
12-16-2009, 11:11 PM
looks like 39.09 hertz to me. me my self does not like to tune high like in the 40+ region and that is very close to it. i like hitting the low notes in the 35 to about 18 hertz. i also do not use the extra volume for displacements some times you will get that one sub that just does not like the bigger boxes. put it this way you may have to rebuild if it sounds like cone fluttering crap cause you added in to much volume and a short port but this is how you got to learn it's trial and error to find out were you like it. if you need more help just say some thing.

That's how Audioque says it's supposed to be tuned and it will still hit the lows.

s_c
12-17-2009, 12:11 AM
all i can say is if it does not sound right then do not leave them in it. that why i say there is a exception. you got two of the bad things i do not do in one box. now if your sub only has about 9 mm of x max i would tell you not to put it in that box most of the time subs with small x-max don't like big boxes. and the cone flutters and bats the voice coil around and sounds like crap. if the company is calling for it there is a reason might be that the box will make the sub spike a little higher and make the sub louder. like earlier all you can do is just trial and error till you get it right.

SicAudio
12-17-2009, 12:20 AM
That is not the same with this slot port, your using 3 of the boxes walls to make up the port. It carries around the corner in this instance. If it ended greater then 8.25" away from the back wall then you account for the corner in the volume.

reread this and think again stupid u have contradicted proven math and urself about 6 times alone just in this thread just shut the fuc k up now lolz

s_c
12-17-2009, 01:36 AM
reread this and think again stupid u have contradicted proven math and urself about 6 times alone just in this thread just shut the fuc k up now lolz

dude chill no need to get hostile over a stinking post. i think he is right on what he is saying for one he is suggesting to tune lower which is correct to do and secondly if you tune lower. you will have to add in the corner of and a plus .5 times 8.25 because of the fact air is moving in and out of the port so the port is further past were it stops no matter what. they talk about this at jl audio under tutorials. like he said it has to be a min of 8.25 from all side's including speakers cause this will make the port seem longer. that one is on rockfordfosgate.com subtitle of : "were to place your port" under the tab at top woofer box wizard. like so

http://www.rockfordfosgate.com/scripts/rightnow.cfg/php.exe/enduser/std_adp.php?p_faqid=26


it’s lv(eff) at link below
http://mobile.jlaudio.com/support_pages.php?page_id=165

Bass911
12-17-2009, 02:09 AM
S_c check yo PM

bromo
12-17-2009, 04:43 AM
reread this and think again stupid u have contradicted proven math and urself about 6 times alone just in this thread just shut the fuc k up now lolz

Your comprehension skills are terrible let alone your attitude.

Blue Fury
12-17-2009, 05:52 PM
I have a black belt in math. I don't want to read the whole thing cause I thought this was just about the RE calculator being racist.

Cliffs of the box details and exactly what is being disagreed on.

J31Rob
12-17-2009, 05:54 PM
u can tuned it to 33hz it will hit low. mine is tuned to 34 and its perfect! but i wouldnt tuned to 40hz unless ur doing mostly comps and barley daily. i would prob tuned this somewhere inbetween 35-37 hz

you're soooo ******* wrong dude lol.

bromo
12-17-2009, 07:30 PM
I have a black belt in math. I don't want to read the whole thing cause I thought this was just about the RE calculator being racist.

Cliffs of the box details and exactly what is being disagreed on.

http://www.caraudio.com/forum/showpost.php?p=6815876&postcount=37

Basically he doesnt think you add the extra length of the corner when ending a slot port in the corner. Instead he adds the corners volume into total box volume and calculates.

Blue Fury
12-17-2009, 11:50 PM
Logic tells me that the air will continue to behave as a port-sized block for a certain distance proportional to the port width. This would have to mean that this volume cannot be included in the internal volume. Right? The only way to include the corner as internal volume would be to stop the defined routine air movement part of the port with, say, a plate over the port end. But maybe I'm wrong

I wish I could give some definite input but I'm not familiar enough with this particular part.

Pr1m3
12-18-2009, 01:55 AM
Well I'm not gonna debate whos right blah blah blah.

However, Bromo, I was looking at the picture of the box you posted and noticed you missed something very important if that corner is to be considered part of the box.

So I recreated it.
http://img695.imageshack.us/img695/4678/box1e.jpg

If you look at the corner, this is gonna throw off your tuning a good amount.
http://img695.imageshack.us/img695/2047/box2e.jpg

What do you think?

Bass911
12-19-2009, 08:37 PM
nevermind:)