PDA

View Full Version : please check my math...please



puckyou
05-30-2009, 02:20 AM
- 2.25 cu.ft. enclosure
- slot ported to 32 hz

- 2" port x 12.5" height x 25" length

- .75" mdf

- sub displacement .14 cu.ft

- measurements
top and bottom, 32 x 14
left and right sides 14 x 12.5
back 30.5 x 12.5
front baffle 28.5 x 12.5
port #1 12 x 9.75
port #2 12 x 11.25

many thanks!

CobraStang98
05-30-2009, 02:31 AM
Looks about right, it's a lil late so i might be a little off too lol

dappa5
05-30-2009, 10:36 AM
- 2.25 cu.ft. enclosure
- slot ported to 32 hz

- 2" port x 12.5" height x 25" length

- .75" mdf

- sub displacement .14 cu.ft

- measurements
top and bottom, 32 x 14
left and right sides 14 x 12.5
back 30.5 x 12.5
front baffle 28.5 x 12.5
port #1 12 x 9.75
port #2 12 x 11.25

many thanks!
don't those port dims need to be x12.5" not 12" you are going from top to bottom right? plus those ports do not equal 25" only 24.5" here look
http://i668.photobucket.com/albums/vv50/DAPPA5/fix.jpg
gl w/ build

Supergumby5000
05-30-2009, 10:44 AM
I'm getting 2.260cu ft @ 31 hz, close enough.

dappa5
05-30-2009, 10:50 AM
gumby look back a few days this guy asked for help i drew him the wedge he wanted then he read the stickies and found that re calc and viola' her's designing his box btw heres one view of what idrew himhttp://i668.photobucket.com/albums/vv50/DAPPA5/puck1.jpgit's in x-ray so you can see the plexi window on the back and the false sides

dappa5
05-30-2009, 10:51 AM
oh yeah i told him only $200 shipped cuz i'm bored oh well better this way he'll gain valuble experience

Supergumby5000
05-30-2009, 10:53 AM
gumby look back a few days this guy asked for help i drew him the wedge he wanted then he read the stickies and found that re calc and viola' her's designing his box btw heres one view of what idrew himhttp://i668.photobucket.com/albums/vv50/DAPPA5/puck1.jpgit's in x-ray so you can see the plexi window on the back and the false sides

the RE calc is off.

dappa5
05-30-2009, 10:57 AM
as always

Supergumby5000
05-30-2009, 10:59 AM
as always

his design in the first post is very close, as i stated 2.26 @ 31 (actually like 31.3hz)

The wedge you have designed has the port very close to the wedge wall. I wouldnt fire a port into a downward curved wedge wall like that, unless you accounted that part of the wedge in the port calculation.

Supergumby5000
05-30-2009, 10:59 AM
as always


oh yeah i told him only $200 shipped cuz i'm bored oh well better this way he'll gain valuble experience

Thats a lot :fyi:

dappa5
05-30-2009, 11:02 AM
your quote" including plexi(lexan) and carpet?

dappa5
05-30-2009, 11:03 AM
his design in the first post is very close, as i stated 2.26 @ 31 (actually like 31.3hz)

The wedge you have designed has the port very close to the wedge wall. I wouldnt fire a port into a downward curved wedge wall like that, unless you accounted that part of the wedge in the port calculation.
did

Supergumby5000
05-30-2009, 11:04 AM
your quote" including plexi(lexan) and carpet?

sheet of wood: $30 (cheaper then that here, actually, but for safe measure)

covering materials: $10

sheet of plexan that small: we'll say $15 tops

$50 to ship it

So your going to pocket $100 for about 2 hours TOPS of work.

dappa5
05-30-2009, 11:05 AM
would have liked to port through the side dummy area one side port (pass) one side cut out like port but goes no where

Scoobydoo
05-30-2009, 11:05 AM
http://www.site.tagsatgig.org/images/check_mark.jpg

Supergumby5000
05-30-2009, 11:06 AM
http://www.site.tagsatgig.org/images/check_mark.jpg

















:laugh:













but seriously, i lol'd, not sure why.

dappa5
05-30-2009, 11:08 AM
sheet of wood: $30 (cheaper then that here, actually, but for safe measure)

covering materials: $10

sheet of plexan that small: we'll say $15 tops

$50 to ship it

So your going to pocket $100 for about 2 hours TOPS of work.

i hade it figured @ bout $120 so yeah $ 80 labor srry i must not be that fast i'll go shoot my self now lol

dappa5
05-30-2009, 11:10 AM
he just had that checkmark and was dying to use it lol:D:crazy::crazy:

puckyou
05-30-2009, 02:30 PM
don't those port dims need to be x12.5" not 12" you are going from top to bottom right? plus those ports do not equal 25" only 24.5" here look
http://i668.photobucket.com/albums/vv50/DAPPA5/fix.jpg
gl w/ build

good catch, so if I lengthen the port by another 1/2" as suggested by Dappa will that get me to 2.25 cu.ft. and 32hz?

Also good catch on the heights being 12 and not 12.5 like they should be.