help designing enclosure

[socialstealth 0]

here is a pic of my trunk:

I have a 12'' DC lvl 4 sub. I drive a sedan.

I like to listen to a lot of pop rock // pop punk // metal music, some have fast bass drums//guitars

I think I'm going to go with some type of ported box, which should I go with? a slotted, vented, ported, or what?

Can anyone help me design a box for my subs? I also don't know which way to port it, towards the trunk?

I'd like to have the box toward the side of the trunk, so I can still fold down the back seat and access the trunk.

[Kanaworm$ 292]

here is a pic of my trunk:

a slotted, vented, ported, or what?

Slotted just means a slot (square) vent using 1 wall of your box. Ported is either a round or slot port.

[socialstealth 0]

here is a pic of my trunk:

a slotted, vented, ported, or what?

Slotted just means a slot (square) vent using 1 wall of your box. Ported is either a round or slot port.

Whats the difference between them? does one have any advantage over the other?

[Kanaworm$ 292]

I haven't heard an audible difference between the two. Depending on the design it's a 50/50 on preference. Advantage of Slot Port is you get the advatage of internal bracing but the enclosure will be bigger. Round Ports like the Aero Port you can mount on the outside of the box and gain more internal enclosure volume. I prefer slot vents.

[socialstealth 0]

I haven't heard an audible difference between the two. Depending on the design it's a 50/50 on preference. Advantage of Slot Port is you get the advatage of internal bracing but the enclosure will be bigger. Round Ports like the Aero Port you can mount on the outside of the box and gain more internal enclosure volume. I prefer slot vents.

what are double baffles, kerfed ports, etc ?

what would you suggest I do with the box?

[shizzzon 461]

basically, if you want ported but may not have enough port area to get optimal size port, go aeroports.

They do not require as much port area and can still be just as loud. However, if you got plenty of room for a slot port, then aeros aren't necessary.

[Kanaworm$ 292]

I haven't heard an audible difference between the two. Depending on the design it's a 50/50 on preference. Advantage of Slot Port is you get the advatage of internal bracing but the enclosure will be bigger. Round Ports like the Aero Port you can mount on the outside of the box and gain more internal enclosure volume. I prefer slot vents.

what are double baffles, kerfed ports, etc ?

what would you suggest I do with the box?

Take a look at Custom Fabricators (Pound That Sound, Audible Customs and Fisher Customs). They custom build enclosures and you can see the great work they do and also what a double baffle and Kerf Port look like.

[socialstealth 0]

I haven't heard an audible difference between the two. Depending on the design it's a 50/50 on preference. Advantage of Slot Port is you get the advatage of internal bracing but the enclosure will be bigger. Round Ports like the Aero Port you can mount on the outside of the box and gain more internal enclosure volume. I prefer slot vents.

what are double baffles, kerfed ports, etc ?

what would you suggest I do with the box?

Take a look at Custom Fabricators (Pound That Sound, Audible Customs and Fisher Customs). They custom build enclosures and you can see the great work they do and also what a double baffle and Kerf Port look like.

I looked through some of the fabricator's sections and did some google research, but I still have a question...

I've read that 'parallel sides' can cause 'standing waves'. Does this mean the sides should be angled? or would 45 degree corners solve this issue?

If not, What are the 45 degree corners for?

Any idea where I can find a formula for slotted kerfed tuning?

[Kanaworm$ 292]

45 degree corners help in bracing and to help with the airflow to the port openig. Not sure if there is a formula for calculating other than subtracting if from your internal volume and taken into account for port length. Kerf cuts take practice and a lot of it! Try 5/8 deep and space anywhere from 1/4" on up to find your desired radius.

[shizzzon 461]

u are scaring yourself... If you keep and keep on researching, you're gonna want an enclosure so pristine that you are gonna want it made into a perfect sphere.

It's not like if not everything is made just right that it's gonna be a failure.

It's nice to have the features, don't get me wrong, but it's also not necessary all the time either.

[socialstealth 0]

u are scaring yourself... If you keep and keep on researching, you're gonna want an enclosure so pristine that you are gonna want it made into a perfect sphere.

It's not like if not everything is made just right that it's gonna be a failure.

It's nice to have the features, don't get me wrong, but it's also not necessary all the time either.

to make a kerfed slot, cant you just cut the shape out several times, stack them, and glue the peices together? this would be stronger and thicker than just cutting slots in the wood, right?

how do you calculate a kerfed slot port tuning frequency?

[socialstealth 0]

is the perfect shape for an enclosure a sphere?

Would rounded internal edges be better than 45 degree angles? Just curious

[socialstealth 0]

the DC suggestions are:

ported: 1.5 ft3

SPL ported: 2.0 ft3

Whats the difference between ported and SPL ported? Will the 1.5 ported sound 'better' ? I'm guessing the 2.0 "SPL ported" throws all SQ out the window?

what frequency do you think I should tune the box to?

going to be run on an SAE1200 @ 1 ohm

i listen to punk pop rock

sedan

Edited September 30, 2009 by socialstealth

[Kanaworm$ 292]

the DC suggestions are:

ported: 1.5 ft3

SPL ported: 2.0 ft3

Whats the difference between ported and SPL ported? Will the 1.5 ported sound 'better' ? I'm guessing the 2.0 "SPL ported" throws all SQ out the window?

what frequency do you think I should tune the box to?

going to be run on an SAE1200 @ 1 ohm

i listen to punk pop rock

sedan

SPL ported would be a higher tuning frequency like 45hz or higher.

You could still do 2 cubic feet but tune it to 35hz and still remain musical. I would stay around the 35hz tuning for your musical tastes.

[jcarter1885 995]

the DC suggestions are:

ported: 1.5 ft3

SPL ported: 2.0 ft3

Whats the difference between ported and SPL ported? Will the 1.5 ported sound 'better' ? I'm guessing the 2.0 "SPL ported" throws all SQ out the window?

what frequency do you think I should tune the box to?

going to be run on an SAE1200 @ 1 ohm

i listen to punk pop rock

sedan

What goals are there for your system? Do you want a daily ground pounder or do you want an all out SPL system? Give us more infor to help you out, you know the rules.

[socialstealth 0]

the DC suggestions are:

ported: 1.5 ft3

SPL ported: 2.0 ft3

Whats the difference between ported and SPL ported? Will the 1.5 ported sound 'better' ? I'm guessing the 2.0 "SPL ported" throws all SQ out the window?

what frequency do you think I should tune the box to?

going to be run on an SAE1200 @ 1 ohm

i listen to punk pop rock

sedan

What goals are there for your system? Do you want a daily ground pounder or do you want an all out SPL system? Give us more infor to help you out, you know the rules.

Sorry I thought I mentioned it earlier,

its for a daily driver. I don't do any competitions at all. I simply want to feel the bass inside me

If I tune it @ 35 hz, does that mean anything BELOW 35 hz will sound like crap?

I've heard 32-33 hz is best for a lvl 4 dc sub.

I want to design my own box really.... how do I know how big to make the port? (i want a double kerfed slotted port)

[jcarter1885 995]

28-30Hz for sledgehammer, down-right ridiculous lows

30-35Hz for daily driving and good lows

35hz and higher more geared towards SPL

I would suggest between 30-35HZ for your tuning.

[socialstealth 0]

28-30Hz for sledgehammer, down-right ridiculous lows

30-35Hz for daily driving and good lows

35hz and higher more geared towards SPL

I would suggest between 30-35HZ for your tuning.

I want the vibrations to rattle my chest, does that mean I want it to be tuned low? I figure lower frequencies cause more vibrations, right?

Is the lvl 4 DC sub capable of being tuned to 30 hz? or would it damage it?

If I can I'd like to have some slight angles in my box, is there a formula for figuring out the tuning frequency for a slotted port? is it relative to length? to cubic feet inside the port?

[jcarter1885 995]

28-30Hz for sledgehammer, down-right ridiculous lows

30-35Hz for daily driving and good lows

35hz and higher more geared towards SPL

I would suggest between 30-35HZ for your tuning.

I want the vibrations to rattle my chest, does that mean I want it to be tuned low? I figure lower frequencies cause more vibrations, right?

Is the lvl 4 DC sub capable of being tuned to 30 hz? or would it damage it?

If I can I'd like to have some slight angles in my box, is there a formula for figuring out the tuning frequency for a slotted port? is it relative to length? to cubic feet inside the port?

Dude your gonna feel(rattles in your chest, whatever that means) no matter what you tune it ass. Once you get to a certain db level your body will feel what the subs putting out no matter the Hz level(just pick one and move on). Yes 30hz will work on that sub, just depens on your preference. The length determines the tuning frequency, height times width determines the port area in inches^2 (12-16in^2 per cubic foot of internal volume).

[socialstealth 0]

The length determines the tuning frequency, height times width determines the port area in inches^2 (12-16in^2 per cubic foot of internal volume).

The height of what X the width of what?

How do I figure out the port area? is the the height X the width of the entire box?

I found this formula:

Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463 x R

it says R (radius of port) = sq rt area / Pi

I assume it means the port area...which if I can figure out how to find that, I'll be golden

Is it bad if the port height is smaller than the rest of the box's height?

[socialstealth 0]

Can you tell me how to get the port area and how to plug it into this forumula (Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463 x R) using this as an example

http://img62.imageshack.us/img62/5149/175cubes32hz26sqin2rg.png

Edited October 1, 2009 by socialstealth