Another check my box calculations with pics (sketchup) post

[amedeuce 10+ year member]

This is for a 12" magnum

I'm hoping that I did this right and the box is around 1.8 cubes net tuned around 30hz.

the box is 24x16x17 outside dim. WIth 3/4 inch mdf.

The port is 14.5 x 2 and around 48 inches of port if I measured correctly.

Here are the sketchup pics

Look of box

Outside dimensions

Top View

side view

Click to read more...

 

[Rawr-DQ 10+ year member]

**** you! What program did you use to do the mockups with, btw looks nice.

 

[amedeuce 10+ year member]

sketchup

 

[GCAdidas13 10+ year member]

lol ameduce... my greatest condolences for not being able to design you one.. i still don't have AutoCAD on my computer, or else I would have designed you one already //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Very sorry! if you still want me to, i'll try to download a copy and get one done for ya //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[amedeuce 10+ year member]

lol ameduce... my greatest condolences for not being able to design you one.. i still don't have AutoCAD on my computer, or else I would have designed you one already //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
Very sorry! if you still want me to, i'll try to download a copy and get one done for ya //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

well are you saying this isn't right?

 

[GCAdidas13 10+ year member]

well are you saying this isn't right?

No i haven't checked it. I'll run it through right now...

volume before sub displacement: 1.85 cubes

i'll take out .07 for sub (that's the actual displacement for SI Mag 12's

if you have 1.78 cubes after displacement, and your port is 48 inches, you have a tuning closer to 28.5 hz.

checking your port length measurement...

vertical one: 15.25 (this is from the opening to halfway through the joint)

horiz one: 2.75 (halfway through first joint to halfway through second joint)

vert two: 13.5 (halfway through second joint to halfway through third joint)

horiz two: 2.75 (you get the idea...)

vert three: 13.5

horiz three: 1.75 (halfway through last joint to opening of port into box)

add all together and get 49.5

you have a 1.78 cubic foot box tuned to 28 hz after you drop the sub in.

This is all straight from WinISD

if you want a different tuning, design a new one and take off about 5" of port. That will probably get you to 30hz

 

[amedeuce 10+ year member]

No i haven't checked it. I'll run it through right now...
volume before sub displacement: 1.85 cubes

i'll take out .07 for sub (that's the actual displacement for SI Mag 12's

if you have 1.78 cubes after displacement, and your port is 48 inches, you have a tuning closer to 28.5 hz.

checking your port length measurement...

vertical one: 15.25 (this is from the opening to halfway through the joint)

horiz one: 2.75 (halfway through first joint to halfway through second joint)

vert two: 13.5 (halfway through second joint to halfway through third joint)

horiz two: 2.75 (you get the idea...)

vert three: 13.5

horiz three: 1.75 (halfway through last joint to opening of port into box)

add all together and get 49.5

you have a 1.78 cubic foot box tuned to 28 hz after you drop the sub in.

This is all straight from WinISD

if you want a different tuning, design a new one and take off about 5" of port. That will probably get you to 30hz

Thanks!!! So I was (am) very close to what I'm looking for..

Can I just knock off 5 inches from the first part of the port.

And I already had the sub displacement figured in at .1 cubic ft..

 

[SPL140.2 5,000+ posts]

Looks similar to the deathbox.

 

[amedeuce 10+ year member]

Looks similar to the deathbox.

??

 

[GCAdidas13 10+ year member]

Thanks!!! So I was (am) very close to what I'm looking for..Can I just knock off 5 inches from the first part of the port.

And I already had the sub displacement figured in at .1 cubic ft..

Yea man I just did the figuring... You'll be really close to 30. Like 29.5 hz, and that's a good tuning.

Make the piece of wood that is nearest the inside of the box 5" shorter. This one:

 

[amedeuce 10+ year member]

Thanks again...

I'll post pics of the build when I get time to build it...

 

[JimJ 5,000+ posts]

Looks similar to the deathbox.

Decware's Deathbox...

http://www.decware.com/newsite/mainmenu.htm

Works off a little different design; your box is the common labyrinth slot port design, allows a lot of port length in a small area.