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lpsrt
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Registered: ‎03-21-2010
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Recommended Box, or Measurment sizes

Hey guys, just bought 2 12" Subs and and Amp and was going to build a sealed enclosure for it. Im new to car audio and dont really know much on how to build one. It has a recommended enclosure size of 48.6L

Here are the specs for it http://insigniaproducts.com/products/car/NS-P2000.html.

Thanks guys!

 

~Lorenzo

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lpsrt
Posts: 15
Registered: ‎03-21-2010
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Re: Recommended Box, or Measurment sizes

Also need help with one thing. I Opened up the box and the subs and notcied there was no wiring on the subs to attach them to the amp. I bought an amp kit with it as well yesturday. It comes with 18 guage speaker wire. Would i use the for the subs? Also there attach togethere the wire for the speaker do i split them or something? and then how will i attach them to the sub.

Thanks!

 

~Lorenzo

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Stu
Posts: 876
Registered: ‎07-11-2007
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Re: Recommended Box, or Measurment sizes

48.9L?? Do you have any idea how large that is?

 

There are many free tools out there that will help to build you a box. Google is your friend :smileywink:

But to do that, you need to know a few things. What material do you plan on building your box out of is the big one. MDF is the popular choice, or fiberglass for a more custom box. MDF is heavy and solid, which is great, but generally takes up more space because of all the straight edges. Fiberglass is usually more expensive because of the time and effort put into making one, but can be customized to pretty well anything..

 

Either way, search Google for some info on calculating a proper box size - Im not sure if you can get all the proper specs you need from those Insignia subs though.. But I didn't really take a close look through the manual, just a quick glance.

 

As for your wiring question, yeah, its no surprise theres no wiring to hook the sub up to the amp, no sub comes with that - that I have ever seen anyways. The wire from your amp kit should do just fine though. I dont really understand what you mean when you say they are attached together? I'd assuming the two subs are connected inside the box with one output on the outside of the box?

 

From what the manual says, they are 8 ohms each, which means in parallel (which I would assume they are wired), they would provide a 4 ohm load to the amp. The amp provides 200 watts per channel. If there is only one output from the box, connect it to the Bridged outputs, and if there is two outputs from the box, use one for each output on the box. 

-Stu

MECP Certified Advanced Installer
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lpsrt
Posts: 15
Registered: ‎03-21-2010
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Re: Recommended Box, or Measurment sizes

I was thinking of making the box out of MDF. Its going to be sealed and they recommend 1.48 FT/3 for sealed box volume. Alos no the sub are not attached together they are seperate. The wires are that came in he kit but im guessing tat you just pul them way from eachoher and u have 2 sperate wires. Also im planning on running the 2 subs on the amp it came with so  wont run it bridged. Im just wondering how to wire the subs aswell. With the box the manua came with some dimensions but i dont know if those are measuments for  box or just for te ubs.

Thanks!

 

~Lorenzo

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Stu
Posts: 876
Registered: ‎07-11-2007

Re: Recommended Box, or Measurment sizes

Ok, if thats the specs for the subs then go by them, still seems to be a little bit larger then it needs to be, but I guess every sub is different. For the speaker wire, you would put wire from each sub to one of the two terminals on the amp - and the other sub to the other terminals.

 

What were the measurements the manual gave you?

 

What type of vehicle is this going to go into? Did you have a shape or any specific size you were looking to build it?

 

I would start by measuring the width, and the height of your trunk (if a sedan) and use that as a starting block. One thing you need to think of as well, especially with a sedan, is if you build a large box, you want to make sure it will bit in the trunk opening or through the backseat if it folds down!!! No point in building a box that wont even fit in the car lol

 

So once you have those measurements, your going to have to do some math to figure out the rest of the sizes you will need for your box. When doing this, remember you want the internal volume, not the external volume. So if you are going to use 3/4" MDF, take 3/4" off each side when measuring internal volume.

 

Remember internal volume = length x width x height.

 

1.43cubic feet, is 17.76 cubic inches, which gives an internal volume of 5,601.81658 cubic inches - so that is what you will want to use when determining the final box size.

 

There are plenty of full guide out there to help you cut the wood and put the box together, try out google to find a full tutorial on building a box from start to finish. The hardest part is getting your measurements right for your own vehicle.

 

Good luck!

-Stu

MECP Certified Advanced Installer
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lpsrt
Posts: 15
Registered: ‎03-21-2010
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Re: Recommended Box, or Measurment sizes

The measurments the manual gave me is this

Mounting Depth-6.02 inches (153mm)

Total Depth-6.69 inches (170mm)

Overall Diameter-12.4 Inches (315mm)

Mounting hole diameter (cutout)-11.02 inches (280mm)

Weight-12.10 lb. (5.5 kg)

Recommended enclosure size-48.6L

 

The car this is going in is a 1997 ford escort lx sedan

 

I did a calculator on the box volume and dis 48.6l and it came back as 1.716 ft/3

 

I did some dimensions on a calculator for the box and i did

width-28"

height-15.5"

depth-9.5"

and the box came to 1.717 ft/3

So i was thinking of using that with 3/4 MDF.

 

 

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Stu
Posts: 876
Registered: ‎07-11-2007
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Re: Recommended Box, or Measurment sizes

So yeah, those specs are indeed for the sub. You'll need to know the mounting hole diameter for when you cut out the hole in the box. Sounds like you have a good grasp of what you are doing, I hope it turns out well for you. Make sure you use lots of glue, you dont want any air leaks!

-Stu

MECP Certified Advanced Installer
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