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View Full Version : How my new BTL design look? Any problems



blackbonnie
04-09-2008, 11:30 PM
its for two fully loaded 15" BTL's, going in an 06 silverado extended cab powered off two IA 20.1's. you guys see any problems. Fairly basic design, just looking for input.

Specs:


175 in^2 Port Area

31" Length of port

35 Hz

12.73 ft^3 Gross box volume

9 ft^3 Net box volume




3.14 Port Displacement (cubic feet)
0.6 Driver Displacement (cubic feet)

3.74 Total Displacement (cubic feet)


External: 19" x 25" x 55"
Internal: 17.5" 23.5" x 53.5"

Port: 17.5" x 9" x 31"

http://i148.photobucket.com/albums/s25/player2007_69/BTL.png

tommyk90
04-09-2008, 11:31 PM
Too much port area, imo. Especially for that large of an enclosure.

casper97ta
04-09-2008, 11:31 PM
Design looks good. Should be really loud in an ex-cab truck and thats a lot of port area.

blackbonnie
04-09-2008, 11:36 PM
i went with 14 in^2 per cubic foot, what would you guys recommend? ive always went with 16 per cubic foot

DB_DRAG_SPL
04-09-2008, 11:38 PM
45 the corners.

tommyk90
04-09-2008, 11:39 PM
i went with 14 in^2 per cubic foot, what would you guys recommend? ive always went with 16 per cubic foot

Well on second thought it should probably work out ok. It's always easier to make a port plug than make a port larger. :)

PsychoTheRapist
04-09-2008, 11:40 PM
nvmnd.

DB_DRAG_SPL
04-09-2008, 11:42 PM
nvmnd.

ninja edit...

blackbonnie
04-10-2008, 01:38 AM
yeah i will run a couple dowels for bracing and some 45's in the corners. how much displacement with a 45 in each corner usually run. but does everyone think that the port area is fine, or is it to big, or what. i went with 14 per cubic foot and most reccommend 12-16 so i figured id go halfway. any more opinions?

coolest user
04-10-2008, 05:21 AM
but does everyone think that the port area is fine, or is it to big, or what. i went with 14 per cubic foot and most reccommend 12-16 so i figured id go halfway. any more opinions?

Are you supposed to figure the port area using net volume or gross volume?

:confused:

iDesignBoxes
04-10-2008, 09:03 AM
Are you supposed to figure the port area using net volume or gross volume?

:confused:

Multiply the height of the opening of the port times with width of the port.

blackbonnie
04-10-2008, 09:37 AM
no he means how do you figure out what your port area needs to be. also how does my design look "idesignboxes" . do you see any problems with it, with the question directed more towards to much port area or do you think it will be fine? think i will have any port noise?

Psydwaze
04-10-2008, 10:00 AM
What software program outputs the rendering that was posted? It looks like a lot of you are using it.

iDesignBoxes
04-10-2008, 12:10 PM
I got 33.76Hz. I'd say you are good to go.

tommyk90
04-10-2008, 12:40 PM
What software program outputs the rendering that was posted? It looks like a lot of you are using it.

No BOX program does that. You figure out the dimensions on paper or using one of the online calculators, you then plug those dimensions into a program called Sketchup. :)

And no, it's not as easy as typing in a few dimensions and *bam*...enclosure. Takes a little time.

blackbonnie
04-10-2008, 04:22 PM
No BOX program does that. You figure out the dimensions on paper or using one of the online calculators, you then plug those dimensions into a program called Sketchup. :)

And no, it's not as easy as typing in a few dimensions and *bam*...enclosure. Takes a little time.

amen to that. but i never use online calculators, i snatch the equations and do it right. ill never trust them.

blackbonnie
04-10-2008, 05:24 PM
anyone else

blackbonnie
04-17-2008, 11:54 AM
startin the build today boys and girls

RAM_Designs
04-17-2008, 02:03 PM
What calculator do you guys use? For 9ft^3 and that port I got a hair over 32hz using the calc on carstereo.com.

On the same calc I get a 6" long port, then I use winISD and is says the same port should be 11" long...

bumpin buick
04-17-2008, 02:09 PM
Looks like it will be a loud box, i think the port should be fine, its big but then again so is the box.

Your sub will be shipped tommorow

blackbonnie
04-17-2008, 02:41 PM
What calculator do you guys use? For 9ft^3 and that port I got a hair over 32hz using the calc on carstereo.com.

On the same calc I get a 6" long port, then I use winISD and is says the same port should be 11" long...

i do the math. paper and pencil is the most accurate way to go. i actually got i think 36.79 or something like that but yeah...paper and pencil and i also made my own calculator in an excel spreadsheet that is dead accurate with the math but only to 2 digits after the decimal. i never use online calcs...they are never accurate

blackbonnie
04-17-2008, 02:42 PM
Looks like it will be a loud box, i think the port should be fine, its big but then again so is the box.

Your sub will be shipped tommorow

i agree, i think the port will be fine. and am excited for the sub. just get me the tracking number when you get a chance