Box plans?

[Sniperslayer]

anyone have any link to diagrams for sub boxes?

i'm having a hard time designing one for my new sub, as the plans that are provided on the website are wayyy too big for my liking, i'm not down with building a dual ported 26" long box

a single port 12" box would be nice, but the only problem is i have an internal amp to install as well, so i need to cut the hole for the amp in the back as well as have the space to mount it within the box

 

[avaserfi]

My suggestion would be check out the program WinISD. I just started playing with it and the program is very useful in helping to design sub boxes.

It can be found here: http://www.linearteam.dk/

FYI: Taking any old box design and tossing a random driver in it will not work out well, you need to take into account the driver when building the box. That is why this program works well.

 

[mazersteven]

Ask this guy

http://forums.soundandvisionmag.com/audiovideo/profile?user.id=4885

 

[annunaki]

anyone have any link to diagrams for sub boxes?

i'm having a hard time designing one for my new sub, as the plans that are provided on the website are wayyy too big for my liking, i'm not down with building a dual ported 26" long box

a single port 12" box would be nice, but the only problem is i have an internal amp to install as well, so i need to cut the hole for the amp in the back as well as have the space to mount it within the box

If your driver has certain plans, they are a certain size for a reason. That reason is to achieve the frequency response claimed by the design. If the enclosure is made smaller the response will greatly change as will the dimensions of the port. If the enclosure is made smaller and the same port diameter is kept the port length will need to increase. The opposite is true if the enclosure volume is increased.

What sub woofer and amplifier are you using? If you can get me the dimensions of the amplifier and the T/S parameters of the sub I can design an enclosure for you to your liking. you will also need to let me know the size constraints it must fit and what you are wanting to achieve with the sub.

 

[Sniperslayer]

i know it has certain plans, but he also had a sealed enclosure which was at least half the size of this monster dual ported box, i'm definatly willing to make somthing smaller, even at the sacrafice of performance because it was just wayy too big, anyways annunaki that sounds great if u could help me out, here's all the info i can find:

this is the plate amp:

http://www.creativesound.ca/details.php?model=LT350

referance pics:

Driver:

http://www.creativesound.ca/details.php?model=SD12

Dimensional Drawing:

[URL="http://www.creativesound.ca/pdf/CSS-SD12-subduction-data.pdf]http://www.creativesound.ca/pdf/CSS-SD12-subduction-data.pdf[/URL]

the ports i have:

here's a link to the dual ported box plans i'm refering to:

http://www.creativesound.ca/pdf/SubDuction-plans-290307.pdf]http://www.creativesound.ca/pdf/SubDuction-plans-290307.pdf

and here's a link to a guy on the AVSforum who built his own [similar to what i'm looking for] who took frequency tests etc. :

http://www.avsforum.com/avs-vb/showthread.php?t=870402&highlight=SD12]http://www.avsforum.com/avs-vb/showthread.php?t=870402&highlight=SD12

this sub is going in a 26X20 room with cathedral ceilings, i'm looking for it to be loud and have a nice "boom" for music, movies, and gaming

i'm not really bound by any size constraints but i wouldnt like it to be TOO big, possibly like 22 inches deep?

also most likely single port only to keep the size down

i hope thats enough info to adequetly design a box?

 

[j_garcia]

Did you ask the people who provided the vented design if they had an existing sealed design?

 

[Sniperslayer]

Did you ask the people who provided the vented design if they had an existing sealed design?

they do, it's in the plans I posted in the above message, but it's much too small to mount my amp within it it seems

 

[j_garcia]

I have a tube and I mounted my amp in a small box separate from the sub. You could also build the box big enough to accommodate the amp but make the internal volume the correct size for the driver.

 

[Sniperslayer]

I have a tube and I mounted my amp in a small box separate from the sub. You could also build the box big enough to accommodate the amp but make the internal volume the correct size for the driver.

i was perhaps considering that is there any loss in quality or anything moving these plate amps further away from the sub?

 

[j_garcia]

i was perhaps considering that is there any loss in quality or anything moving these plate amps further away from the sub?

No, it shouldn't make any difference. It is just like any other speaker, just send it a signal and it will be fine. I have been running mine this way for around 2yrs now.

 

[annunaki]

I am not quite sure if I understand you here. You will go to 22" for the sub but not 26"? Which dimension is this for? Height?

In a room that size, if you decide to go sealed, I would buy another sub and have a pair. If you want loud low response (with one sub) you will need to go ported. Dual ports allows more air to be moved with a much lower probability of port noise. I will check out the parameters later tonight or tomorrow when I have a chance and see what I can come up with for you.

 

[j_garcia]

I am not quite sure if I understand you here. You will go to 22" for the sub but not 26"? Which dimension is this for? Height?

In a room that size, if you decide to go sealed, I would buy another sub and have a pair. If you want loud low response (with one sub) you will need to go ported. Dual ports allows more air to be moved with a much lower probability of port noise. I will check out the parameters later tonight or tomorrow when I have a chance and see what I can come up with for you.

Ditto that...sealed gets you a smaller cabinet but it also won't activate the air quite the same way that a good vented design will.

 

[annunaki]

So the external dimensions are 18.5" x 24" x 24" according to the plans. If you set the sub so it is with the 18" side down it will take up less floor space. It has a gross internal volume of 4.98 ft^3. The same could be achieved with external dimensions of 15" x 26" x 27" or a tube of 16.5" diameter and 40" tall (internal). There are other options out there as well. I will know more when I can run it through my program.

 

[abefroeman]

they do, it's in the plans I posted in the above message, but it's much too small to mount my amp within it it seems

So mount it outside the box, in its own box and then run the speaker wire to the sealed sub.

or modify the box plans to accomidate your amp.


Edit: with this home theater stuff you really have to think outside the box

 

[Sniperslayer]

So the external dimensions are 18.5" x 24" x 24" according to the plans. If you set the sub so it is with the 18" side down it will take up less floor space. It has a gross internal volume of 4.98 ft^3. The same could be achieved with external dimensions of 15" x 26" x 27" or a tube of 16.5" diameter and 40" tall (internal). There are other options out there as well. I will know more when I can run it through my program.

All i know is the size of the one he had at his home [which the plans lay out] looked absolutely rediculous, and it would stand out like a sore thumb in my HT room

i would be much more willing to go with a single port design like the one i posted on the AVS forum here:

http://www.avsforum.com/avs-vb/showthread.php?t=870402&highlight=SD12

how much am i going to lose though going with a smaller box? i know my room is very large but even in a very large room that massive box would not look good at all

 

[annunaki]

Sniper,

4 ft^3 is roughly 15" x 24.5" x 24.5" external dimensions when using 3/4" MDF. It is not a very large difference. I will see what I can do about a ported enclosure for you when I get a chance. I will try to find a good balance between response and size. I do not like the bracing technique they use with all of the holes and such. It leaves too much MDF to take up internal volume. Keeping the port away from internal walls is important in reducing turbulence as well.

The guys enclosure on the other forum looked really nice. I would not put the port on the back of the enclosure though. It is best to have it on the same plane as the driver as they will align much better (acoustically).

 

[Sniperslayer]

^ yea i was somewhat skeptical about the holes to begin with, not even knowing much about box design etc.

here's another box i found, which the creator was refered to me:

the first one looks decent:

http://forums.soundandvisionmag.com/audiovideo/board/message?board.id=57&message.id=4342&query.id=2414#M4342

 

[annunaki]

I got a chance to model the sub. I came up with a 2.75 ft^3 net internal volume tuned to 23hz. You have two port options a single 4" port 20" long (with flared ends) or two 3" ports 23-1/2" long. Remember that port, driver, and bracing displacement must be added to the internal volume before figuring the external dimensions. I can figure up some different dimensions for you later.

 

[Sniperslayer]

I got a chance to model the sub. I came up with a 2.75 ft^3 net internal volume tuned to 23hz. You have two port options a single 4" port 20" long (with flared ends) or two 3" ports 23-1/2" long. Remember that port, driver, and bracing displacement must be added to the internal volume before figuring the external dimensions. I can figure up some different dimensions for you later.

wow that sounds great, what would u recomend going with?

 

[annunaki]

Ideally, I would do the dual 3" ports, however, they are fairly long. The single 4" port saves 3.5" on port length, but does not have as much port area.

Unless you are doing flexible tubing or putting a right angle bend on the port(s) one of the dimensions will be fairly large to accomodate the port. Square/rectangular vents are an option as well. They are a bit more work, but actually strengthen the enclosure.

Using a single 4" aero port I get external enclosure dimensions of 15" x 18" x 25.5". Or you could hang the port out side the enclosure and change the dimensions

Using dual 3" ports would require a larger enclosure. I would probably recommend doing a rectangular vent if you were thinking of having port area equal to dual 3" ports (14.14 sq. inches.)

These measurements assume the use of 3/4" MDF. The dimensions also allow for all of the displacement of the port, driver, amplifier and bracing.

I would recommend the port and driver on one of the 15" x18" panels. I do not have access to fancy animation to draw a design out for you though.