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View Full Version : Design for Tuans Custom 15" sub thats going to get 3800rms Daily from a T30001bd



SHiZNiLTi
05-02-2007, 08:51 PM
So I just bought this HUGE 15" sub with a superior 3 points of cooling and a 4" Coil that will take 3-4k rms daily very easily. This is absolutely not a production model sub (yet) and costs a whole lot to build. It's extremely heavy and has very good motor strength.

Pics simply don't do it justice....

http://www.teamtoxicbass.com/~tuan/Pictures/BigSPL15_1.jpg


Anyways I need to get a box made by Friday night.

I'm thinking about doing a CRX style box around 4 cuft tuned to 38hz.

This is what I've come up with so far...

4.5 cuft tuned at 38hz with 81sq.in. of port area:

box: 34" wide x 24" deep x 15" tall

port: 32.5" wide x 2.5" tall

I'm going to use resin and half a PVC pipe as a form to make a perfectly round smooth corner in the corner of the box where the back of the port is. Hopefully this will cut down on any type of port noise that may be caused by the small height of the port that is only 2.5" tall. I'm also going roundover with my router every edge that need it.

http://img106.imageshack.us/img106/5932/45cuft1gi2.jpg

http://img163.imageshack.us/img163/1752/45cuft4ix3.jpg

Please give me any ideas on a design that you think will be good for this sub.

BTW it's going into the blazer in my sig.

lilmaniac2
05-02-2007, 08:54 PM
any more pics?

60ndown
05-02-2007, 09:04 PM
few braces and your good 2 go.

SHiZNiLTi
05-02-2007, 10:51 PM
No more pics as of now, but the sub should be here this Friday and I will take a bunch of really hi-detail shots then.

Ok so back to critiquing this design....

There's a few issues that I'd like some feedback on.

1: Im at 81sq.in. of port area. Is this too much for my sub in this 4.5 cuft box? I allways thought you should do 12sq.in. of port per cuft. With that rule I should be around 54sq.in.

2: The port is very narrow, only 2.5" tall. Are there any negative side effects of having the port this narrow in comparison to a standard wider vertical port?

3: Should I redo the design making the port vertical along the side of the box instead of having it horizontal along the bottom?

4: Where would you add bracing.

lilmaniac2
05-02-2007, 10:52 PM
i would make the port about 2-3 inches shorter and pour resin in that back corner making it a curve

Calikid
05-02-2007, 10:54 PM
make the port bigger, or else port noise FTL :crap:

SHiZNiLTi
05-02-2007, 10:57 PM
i would make the port about 2-3 inches shorter and pour resin in that back corner making it a curve
That sounds like a good idea, I plan on doing that and using a 6" diameter PVC pipe as a mold that will form the resin in a perfect curve.

Question though, how long does that much resin take to harden? and does anyone know where to find pics of this being done? I remember seeing a build here with a snake port and he poured resin using this PVC pipe as a mold for all 6 port bends.

SQBubble
05-02-2007, 10:59 PM
No more pics as of now, but the sub should be here this Friday and I will take a bunch of really hi-detail shots then.

Ok so back to critiquing this design....

There's a few issues that I'd like some feedback on.

1: Im at 81sq.in. of port area. Is this too much for my sub in this 4.5 cuft box? I allways thought you should do 12sq.in. of port per cuft. With that rule I should be around 54sq.in.

2: The port is very narrow, only 2.5" tall. Are there any negative side effects of having the port this narrow in comparison to a standard wider vertical port?

3: Should I redo the design making the port vertical along the side of the box instead of having it horizontal along the bottom?

4: Where would you add bracing.

rule of thumb is 16sq.inch each cu.ft, 81sq.inch should be ok, little bit more would be better IMO

btnhfan
05-02-2007, 11:00 PM
APX motor?

tommyk90
05-02-2007, 11:06 PM
Now, IMO.

81 square inches is TOO much port area. For a daily driving enclosure I would do something more like 50-60 square inches of port area.

Also, I don't like those port dimensions either. Having a port that wide, with that little height could cause some serious port turbulence and port noise.

To correct that and get efficient airflow, I would do a port that follows the HEIGHT of the box, rather than the WIDTH (a vertical port as you put it). This would let the port be wider thus reducing port shuffling/port noise and would let you knock down the port area to get sufficient tuning.

Kenny Pollock
05-02-2007, 11:09 PM
I'm with Tommy on this one :) Also, what happened to the BTL?

SHiZNiLTi
05-02-2007, 11:12 PM
I'm with Tommy on this one :) Also, what happened to the BTL?
The BTL is still around. It's getting installed in a 07' Avalanche :D

Kenny Pollock
05-02-2007, 11:16 PM
Nice, your Avalanche?

Not to ***** the thread... but my Blazer is going black dude! House of Kolor Limetime Pearl on the inside, accents on the black outside.

SHiZNiLTi
05-02-2007, 11:16 PM
Now, IMO.

81 square inches is TOO much port area. For a daily driving enclosure I would do something more like 50-60 square inches of port area.

Also, I don't like those port dimensions either. Having a port that wide, with that little height could cause some serious port turbulence and port noise.

To correct that and get efficient airflow, I would do a port that follows the HEIGHT of the box, rather than the WIDTH (a vertical port as you put it). This would let the port be wider thus reducing port shuffling/port noise and would let you knock down the port area to get sufficient tuning.

Ya, I had to make the port like that or else tuning would be too high, If I made it 3.5" instead of 2.5" I would have been farting at 47hz with 113sq.in. of port FTL since it's daily.

I'm going to redesign the box so that the port isnt along the bottom. I'll make the port vertical and will still use the idea of using resin with a PVC pipe mold to make the perfect curve.

Anyone know how long this much resin would take to cure?

What about (4) PRECISION PORT 4" FLARED PORT's at 18" long? That would get me at 38hz tuning with 50sq.in. of port area. Would that be any better then using resin to make a perfect curve?

Do you guys think I should stay aroudn 4.5 cuft or do 4 cuft?

Keep in mind this is a daily setup.

j3bus2k3
05-02-2007, 11:19 PM
Why not some Aeros? Would take up much less space, and could get away with using alittle less port area. Only problem I would see is the actual length...

Calikid
05-02-2007, 11:19 PM
The BTL is still around. It's getting installed in a 07' Avalanche :D

:fro:

dleccord
05-02-2007, 11:24 PM
i'd go with a rectangle or square port. aeros if you wanna spend more money.

SHiZNiLTi
05-02-2007, 11:30 PM
Why not some Aeros? Would take up much less space, and could get away with using alittle less port area. Only problem I would see is the actual length...


i'd go with a rectangle or square port. aeros if you wanna spend more money.

LOL, I just posted that the while you were making your post about it :D

(4) 4" aeros at 18" long will get me at 38hz with 50sq.in. of port area for my 4.5 cuft box. The 18" length wont be an issue since the box is 24" deep.

The thing though is that I want to get this box ready by saturday afternoon since thats when we are having a caraudio.com meet. Does anyone know of anyplace that I can get good aeroports in AZ or a place that I can order them from that will get them here by Friday or Sat morning?

tommyk90
05-02-2007, 11:33 PM
LOL, I just posted that the while you were making your post about it :D

(4) 4" aeros at 18" long will get me at 38hz with 50sq.in. of port area for my 4.5 cuft box. The 18" length wont be an issue since the box is 24" deep.

The thing though is that I want to get this box ready by saturday afternoon since thats when we are having a caraudio.com meet. Does anyone know of anyplace that I can get good aeroports in AZ or a place that I can order them from that will get them here by Friday or Sat morning?

I say just go with a rounded slot port. :)

Even try kerf cutting and do one of the fancy flared slot ports that we are seeing a lot of these days.

SQBubble
05-03-2007, 12:20 AM
I say just go with a rounded slot port. :)

Even try kerf cutting and do one of the fancy flared slot ports that we are seeing a lot of these days.


man these type of port is a turn on !!

dleccord
05-03-2007, 12:40 PM
how hard is it to tune a kerf port?

SHiZNiLTi
05-03-2007, 01:11 PM
Ok so this is the new design, with the curved port using resin, let me know if you think I should change anything...

Box: 34" wide x 15" tall x 22" deep

Port: 4.75" wide x 13.5" tall x 16.5" long

4.2 cuft @ 36hz with 64 sq.in. of port area...

http://img502.imageshack.us/img502/9666/4236hz64sqin1yr0.jpg

http://img399.imageshack.us/img399/1507/4236hz64sqin2gk0.jpg

http://img231.imageshack.us/img231/3918/4236hz64sqin3kr6.jpg

60ndown
05-03-2007, 01:20 PM
Ok so this is the new design, with the curved port using resin, let me know if you think I should change anything...

Box: 34" wide x 15" tall x 22" deep

Port: 4.75" wide x 13.5" tall x 16.5" long

4.2 cuft @ 36hz with 64 sq.in. of port area...

http://img502.imageshack.us/img502/9666/4236hz64sqin1yr0.jpg

http://img399.imageshack.us/img399/1507/4236hz64sqin2gk0.jpg

http://img231.imageshack.us/img231/3918/4236hz64sqin3kr6.jpg
nice

60ndown
05-03-2007, 01:22 PM
Nice, your Avalanche?

Not to ***** the thread... but my Blazer is going black dude! House of Kolor Limetime Pearl on the inside, accents on the black outside.

where the phuk do you get your moniez? and dont tell me a young kid can generate that kind molah working for $9 and hour less tax, your moma / popa has go to be lineing your pockets.

:eyebrow:

SHiZNiLTi
05-03-2007, 01:25 PM
where the phuk do you get your moniez? and dont tell me a young kid can generate that kind molah working for $9 and hour less tax, your moma / popa has go to be lineing your pockets.

:eyebrow:
Plz, no Kenny Pollock flamming in my thread - thnx :D

Anyone know how long the resin in the corner will take to cure to the point that its hard enough that I can sand it smooth?

SHiZNiLTi
05-03-2007, 01:57 PM
Personally if this is gonna be all spl Id go with fiberglassing all corners or using pvc and rounding all interior corners, resining the box, rounding over that port wall. Just what I would do. I do resin all my boxes though lol
Thnx for info. It's not all SPL, I'm going to use this as a daily listening setup, but with the power involved I want to get this box as strong as possible. I've got a router so I'll definataly round over the port and the rest of the box too. I'm also going to use the PVC as a form to make a curved corner, but is it really needed in all 4 corners? Are the other 3 resin curved cornes just for bracing or does it somehow help with the airflow out of the box?

Since you have alot of experience with resin do you have any hints. I've never used it before. How do you heat it up and whats the point of doing that, also what are you mixing, and what type of resin do I get. Home Depot has some I think?

SHiZNiLTi
05-04-2007, 12:18 AM
This is what I plan on trying to do...

http://img176.imageshack.us/img176/1448/68351341full8f64cdvs9.jpg

http://img176.imageshack.us/img176/9914/68351347full8f8f28lj2.jpg

http://img176.imageshack.us/img176/7489/68351351full9078ecuf9.jpg

http://img77.imageshack.us/img77/4251/68351355full924b6aky4.jpg

pics provided by Kenneth Cardona

I just need to do a lil more research on how to mix the resin and heat it and hopw to pour it. Also need to know how long it takes to cure hard enough to sand.

Thanks!

tommyk90
05-04-2007, 12:56 AM
I would move the sub farther away from the port opening. :)

As for the resin in the corners thing, I don't like it. Having resin that thick inside a box building up that much pressure (and flexing/shaking) would lead me to believe that the resin will crack and fall apart over time. If anything, I would use some thin wall PVC and staple/glue them into the corners.

SHiZNiLTi
05-04-2007, 01:11 AM
I would move the sub farther away from the port opening. :)

As for the resin in the corners thing, I don't like it. Having resin that thick inside a box building up that much pressure (and flexing/shaking) would lead me to believe that the resin will crack and fall apart over time. If anything, I would use some thin wall PVC and staple/glue them into the corners.

I've heard other people say that too, but what about steve meades box for his (4) 18's, I think he poured resin into each corner.

Anyways- I agree, I'd like to move the woofer. I've allwyas had it centered.

Which direction would you move it? A, B, Cor D?

http://img79.imageshack.us/img79/4776/abcdgq2.jpg

Drag0n_45
05-04-2007, 01:52 AM
I'm gonna say a little bit to the D.

SHiZNiLTi
05-04-2007, 01:55 AM
anyone else? this build starts tomorrow.

rpfuror
05-04-2007, 09:41 AM
Ok so this is the new design, with the curved port using resin, let me know if you think I should change anything...

Box: 34" wide x 15" tall x 22" deep

Port: 4.75" wide x 13.5" tall x 16.5" long

4.2 cuft @ 36hz with 64 sq.in. of port area...

http://img502.imageshack.us/img502/9666/4236hz64sqin1yr0.jpg

http://img399.imageshack.us/img399/1507/4236hz64sqin2gk0.jpg

http://img231.imageshack.us/img231/3918/4236hz64sqin3kr6.jpg

mmm..
Here is the best case for this box.. (including driver displacment but not your double baffle.)
Net Volume: 4.06 cu/ft
Tuning Freq: 38.56 Hz
Port Area: 64.13 sq/in

Why not build something like this style box.. you will be able to get more port area and more internal volume. (disregard the size and dimesions, just trying to give you an example).

http://i135.photobucket.com/albums/q145/rpfuror/Box%20Design/2_18_btl.jpg

tommyk90
05-04-2007, 10:11 AM
I've heard other people say that too, but what about steve meades box for his (4) 18's, I think he poured resin into each corner.

Anyways- I agree, I'd like to move the woofer. I've allwyas had it centered.

Which direction would you move it? A, B, Cor D?

http://img79.imageshack.us/img79/4776/abcdgq2.jpg

C

Towards that corner. :)

snoopdan
05-04-2007, 10:59 AM
fill those corners with fiberglass matte and resin over it...that way you're not using a ton of resin to accomplish the same thing, nor having to worry about the resin cure cracking if you mix it improperly.

also dont forget to wax the resin once it dries....turtle wax does well :naughty:

kicker06
05-04-2007, 05:15 PM
C for sure.

SHiZNiLTi
05-04-2007, 05:56 PM
C it is.

Calikid
05-05-2007, 12:13 AM
pics of sub :yumyum:

SHiZNiLTi
05-05-2007, 06:38 PM
http://www.caraudio.com/forum/showthread.php?p=3014720#post3014720

SQBubble
05-06-2007, 04:09 PM
This is what I plan on trying to do...

http://img176.imageshack.us/img176/1448/68351341full8f64cdvs9.jpg

http://img176.imageshack.us/img176/9914/68351347full8f8f28lj2.jpg

http://img176.imageshack.us/img176/7489/68351351full9078ecuf9.jpg

http://img77.imageshack.us/img77/4251/68351355full924b6aky4.jpg

pics provided by Kenneth Cardona

I just need to do a lil more research on how to mix the resin and heat it and hopw to pour it. Also need to know how long it takes to cure hard enough to sand.

Thanks!

where can you get the withe tubes? and is this with resin only?

uhoh45
05-06-2007, 05:44 PM
home depot

937DYTBOI
05-15-2007, 09:51 PM
looks good