i got metered....

[PwnMaster]

3.66 will work, the main thing is your loosing some off your low end, but the box has a good gain and nice decent. I usualy try to get the cutoff freq lower but you should be all right.

THAT graph means nothing inside a car.

Im sorry.

 

[DarkFox 10+ year member]

That graph means nothing??? Thats one of the most important things man. YES, your car changes some of the acoustical response properties, but this graph is how the box itself responds. If you have a bad design from the start, it doesn't matter what car its going in.

This graph shows the box gives a smooth transition to the gain and to the decent slope. There is no odd peaks. Over all this box should be a little on the boomy side (not dropping as low as a SQ setup) but should be good sound and plenty loud for daily driving. You need to play with programs like this Pwnmaster, research the T/S parameters yourself, try some different enclosures in theory in the program, then build them yourself IRL to see how they respond to how you thought they would. Once you have done that, and have some actual information to contribute, (not just flaming this guy and everyone who tries to help him,) then come back and post in here. The way your going, your going to have a short life on these forums. Moderators don't take too kindly to people who never actually try to help, and just make problems in legitimate posts, with antagonistic responses.

 

[cocoleveo7686 10+ year member]

3.66 will work, the main thing is your loosing some off your low end, but the box has a good gain and nice decent. I usualy try to get the cutoff freq lower but you should be all right.

thanks for all the help...now what if i tune to between 32-34 will that work better? i dont meter alot...once in a great while, its mostly for daily, but i want something real loud

 

[DarkFox 10+ year member]

the problem is that the box is already pretty small. When you try to tune lower, you need to add length to the port. Length that subtracts more from the box volume. Larger box volumes make the subs move easier and the box more efficient, also, are much better suited for low frequencies.

Basically what I am getting at here is with the size and tuning its at now, you have pretty much reached a point of diminishing returns. To tune lower, you need longer port, takes more space, makes box smaller, cutting down your efficiency, making you not as loud. Make sense?

 

[DarkFox 10+ year member]

This should make it alot easier to understand what I am getting at.

Here you can see three plots.

The first plot (blue)(yours) starts its cutoff at about 35 Hz and has a max gain of about 2.2DB in the 62hz area with about a medium width peak. (slightly boomy in those freq.)

The second plot (yellow) is tuned a little lower in the space you got, resulting in a slightly smaller box also. you see even though it is tuned lower, 32hz, it actualy starts to cutoff before the first box. (this one is about 36.5). It has a max gain also of only about 1.6 and has a slightly wider peak, which would be slitly less boomy (though not as loud and not drop as low)

The third one is what I would idealy go for (I enjoy the more the SQ then the spl, though when I can I go for both.) This one is tuned to 31 HZ but because we also have box volume working for us its cutoff begins around 28 HZ. Its max gain is in fact only about 1.3 but has a very wide peak, so the sound will be smooth across that large elevated range, and the peak is also around 48HZ. Resulting in a box that will sound much louder in the low range bass. 12's dont have any problem in that mid range bass, so I'm not concerned there anyway. In a Ideal world, this is what I would go for.

EDIT: i realize that third box is hard to see, its 6.5 cubic feet

 

[ballstothewall 10+ year member]

*edit*

Didn't read correctly...

 

[cocoleveo7686 10+ year member]

This should make it alot easier to understand what I am getting at.

Here you can see three plots.

The first plot (blue)(yours) starts its cutoff at about 35 Hz and has a max gain of about 2.2DB in the 62hz area with about a medium width peak. (slightly boomy in those freq.)

The second plot (yellow) is tuned a little lower in the space you got, resulting in a slightly smaller box also. you see even though it is tuned lower, 32hz, it actualy starts to cutoff before the first box. (this one is about 36.5). It has a max gain also of only about 1.6 and has a slightly wider peak, which would be slitly less boomy (though not as loud and not drop as low)

The third one is what I would idealy go for (I enjoy the more the SQ then the spl, though when I can I go for both.) This one is tuned to 31 HZ but because we also have box volume working for us its cutoff begins around 28 HZ. Its max gain is in fact only about 1.3 but has a very wide peak, so the sound will be smooth across that large elevated range, and the peak is also around 48HZ. Resulting in a box that will sound much louder in the low range bass. 12's dont have any problem in that mid range bass, so I'm not concerned there anyway. In a Ideal world, this is what I would go for.

EDIT: i realize that third box is hard to see, its 6.5 cubic feet

so you think im better off tuning to like 31 hz instead of 35?

 

[DarkFox 10+ year member]

no, only if you have the air space to back it up, notice the one tuned to 31 hz (the white plot) is showing it in a 6.5 cubic foot box

 

[Notloud00 10+ year member]

ill remeasure again tomorrow and see if i can go a little bigger...

i dunno why everyone is sayin its not loud, if you heard my system you would htink its louder, my windshield flexes...not saying its the loudest system, but it sounds good...i bet half you havent sitten in a sentra spec with a system and heard it with over 140 dbs enless they have alot of subs

ur a tard

 

[IgnoreMe 5,000+ posts]

well arent you just a perfect perfect person. so, so does everybody else. or they go "weak" or FAIL. i am no diff.

i never said i was perfect, its just that you always tell people "im louder with less equipment haha" and shit like that.

your doing good for the equipment you have. try to be a little humble

 

[Notloud00 10+ year member]

i never said i was perfect, its just that you always tell people "im louder with less equipment haha" and shit like that.
your doing good for the equipment you have. try to be a little humble

ok thanks. i actually need to shoot a video of my cheap little setup hmmmm. also OP i wouldnt do less than 4 cubes for those l7's. i would sell them and put one 15 in there n the biggest box you can.//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

edit sry i meant l7's

 

[DarkFox 10+ year member]

Who is OP and who has r's?

 

[snb778 5,000+ posts]

Yeah get a 12 inch Mt
A member on here has 1 and is hitting 147 db with 3krms on TL

or Get a Fi BTL

WOW is there ever an FI-BTL boner on here!! What happened to the Almighty SI MAG!! That is where its at! or the TC3000

 

[IgnoreMe 5,000+ posts]

Who is OP and who has r's?

op = original poster

 

[DarkFox 10+ year member]

thanks ignoreme, was just wondering if he had mixed up threads when he was talking about the R's