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View Full Version : Does this RL-i8 box plan look ok?



ItalynStylion
12-13-2006, 09:38 PM
This is the first box I have ever tried to design. The sub is going to be an Rl-i8 which the site says needs 0.6cubes sealed. Does that mean 0.6 without the sub in it or X-(sub driver volume)=0.6?
I'm guessing that I will go with sealed since I want the best SQ and also because tuning a port on a box that small would be hell for me :crazy:

Will this box design work?
Is is going to be a ***** to build?

This picture is the end of the box on both sides. I chose .75in MDF in the drawing, that is what most of you guys use right? The surface area of what will become the airspace once depth is added, is 0.411 cubic feet. Which means it will have to be 1.46 feet long to get the .6 volume I want. What about those overhangs where the 11inch piece and the two 3 inch pieces meet, is that a problem?
http://i17.photobucket.com/albums/b75/ItalynStylion/SubStuff/FaceBoardPic.gif

This is what it will look like solid, with the sub in the large face in the front...
http://i17.photobucket.com/albums/b75/ItalynStylion/SubStuff/FaceboardExtrudedPic.gif

What do you guys think?

Trey803
12-13-2006, 09:40 PM
Sure but if you cut the whole according to the drawing you are going to have major problems . Im guessing you did not mean to make the cirlce so big.

Pyro_By_Nature
12-13-2006, 09:41 PM
I think you should switch programs.

ItalynStylion
12-13-2006, 09:45 PM
That circle is just a reference for 3D view, it has nothing to do with the object at all. Sort of a cross airs if you will...

ItalynStylion
12-13-2006, 09:48 PM
Like this....the circle here is exact and to scale where the sub will go
http://i17.photobucket.com/albums/b75/ItalynStylion/SubStuff/FacewithCircle.gif

ItalynStylion
12-13-2006, 09:51 PM
At first I was worried about the magnet hitting the back of the box but I took some measurements and I checked the clearance for the magnet and it will fit just fine.

Acoustically is the design poor in any way?
I really need everyones help here...

supa_c
12-13-2006, 09:52 PM
its sealed, doesnt make a difference

Trey803
12-13-2006, 09:53 PM
Ive heard sqaure gives the best sq. My opinion......in a sealed box a normal person would not be able to hear the difference in the shape.

PV Audio
12-13-2006, 10:15 PM
You actually want to stay away from cube shaped enclosures unless you have beveled edges.

Rattlebrain
12-13-2006, 10:35 PM
Don't mean to jack the tread but what if you had the Patience and ability to make a round enclosure, would it work/sound Better?

ItalynStylion
12-13-2006, 11:15 PM
As far as carpeting the box when I'm done building it do I use some type of glue or staples?

Links to good info appreciated...I enjoy a good insightful read

supa_c
12-13-2006, 11:17 PM
Neither
Rubber Cement

ItalynStylion
12-13-2006, 11:36 PM
Neither
Rubber Cement

Ahh, I should have guessed. Any particular brand that is favored or are they all pretty much the same?

supa_c
12-13-2006, 11:49 PM
basically all the same stuff

ItalynStylion
12-13-2006, 11:53 PM
Ok, this feels like it might be a dumb question but I need to know...
When carpeting a box near the sub's hole opening, do you go right to the edge? I guess what I'm trying to ask is; should there be carpet between box and the lip on the sub? Seems like it would make a less than air tight seal...

I'm in the process of trying to find a good, "how to carpet an enclosure" thread but failing...

mattmcss
12-13-2006, 11:57 PM
I usually go to the edge of the hole, and just screw through the carpet.

mattmcss
12-13-2006, 11:58 PM
http://www.bcae1.com/carpetenclosure.htm

supa_c
12-14-2006, 12:02 AM
i always trim right around the opening, so the carpet is right at the edge

ItalynStylion
12-14-2006, 11:40 AM
My first question still hasn't been answered. Is the volume X-(sub driver volume)=0.6 or do you build a .6 box then stick the sub in?

Also...polyfill, yay or nay?

LeofromtheH
12-14-2006, 11:45 AM
heres' a good link for carpet/vinyl covering

http://www.splbassx.com/forums/index.php?showtopic=2657

supa_c
12-14-2006, 02:00 PM
My first question still hasn't been answered. Is the volume X-(sub driver volume)=0.6 or do you build a .6 box then stick the sub in?

Also...polyfill, yay or nay?
Usually you account for the driver displacements in the overall plan.
Poly fill is one of those personal preference things. With that large of an enclosure you probably wont need any but its so cheap to try it out.

ItalynStylion
12-14-2006, 03:11 PM
How would I find out how much the sub displaces so I can account for it?

docutech
12-14-2006, 03:17 PM
How would I find out how much the sub displaces so I can account for it?

It is in your subs T/S parameters Vas= x.xx

ItalynStylion
12-14-2006, 03:44 PM
The soundsplinter website has this....
----------------------
T/S Parameters
Single 4 ohm

Qts: 0.217
Qes: 0.235
Qms: 2.798
Fs: 25.7 Hz
Re: 3.78
Ls: 2.022 mH
Lp: 3.859 mH
Rp: 3.786
Dia:
(% shift) 160 m
44.7 %
Vas: 23.44 L
Mms: 92.47 g
Cms: 412.8 u
Bl: 15.51 T*m
n0: 163.8 m
SPL: 84.14 dB
Sd: 0.020 m^2
RMS: 300 watts
Xmax: 18.3 mm
-----------------------
That converted into Cubic Feet is 0.828 so I'm assuming I need to create a box that's 0.828 cubic feet big? Can anyone confirm this? If thats the case its not a big deal I will just increase the length of the box to up the volume.

sqhertz
12-14-2006, 04:16 PM
You actually want to stay away from cube shaped enclosures unless you have beveled edges.

?
most the sealed enclosures ive had were cubed....

maldecido33
12-14-2006, 04:55 PM
he means 12"x12"x12"

there can be issues with standing waves

sqhertz
12-14-2006, 04:59 PM
he means 12"x12"x12"

there can be issues with standing waves


dont mean to jack thread but is that 'there CAN be' or 'there WILL be'?
is there a 'perfect' shape/dimension for a sealed box?

docutech
12-14-2006, 05:05 PM
sealed is sealed, doesnt matter if the box is square or rectangular. The only variable will be the application of its use. Some people cant fit a cube in their vechicle so a narrower rectangular shape is desired for a better fit.

sqhertz
12-14-2006, 05:21 PM
sealed is sealed, doesnt matter if the box is square or rectangular. The only variable will be the application of its use. Some people cant fit a cube in their vechicle so a narrower rectangular shape is desired for a better fit.



hah. i knew i shouldnt of asked.

docutech
12-14-2006, 05:26 PM
hah. i knew i shouldnt of asked.

:hitbrick:

ItalynStylion
12-14-2006, 05:55 PM
dont mean to jack thread but is that 'there CAN be' or 'there WILL be'?
is there a 'perfect' shape/dimension for a sealed box?

Its fine with me if you jack the thread if you answer the question that I had...

If not then I'll send a hit-man to your house;)