help me with my box:( please

[karisma]

heya all, i own a set of 2 x phoenix gold octane R 12inch subwoofers, im currently using a crappy halfords sub box. but i want to build my own box to the correct dimensions effiecient for the sub woofer.

here are the dimensions ive found on my paper work i got with my sub

Ported the dimensions are

volume in cubic feet = 1.35

port diameter = 4 inchs

port length = 12 inchs

im wanting a ported box to the correct dimensions, can any body help me with the dimensions i have given you!!

many thanks
Sean

[brenzbmr@sb]

actually they just gave it too you right there.

build box to 1.35 cubic ft

one port 4 inches (home depot schedual 40 abs platic pipe)

12 inches long..

so im a little confused in your question.

do you need someone to draw it out or make the piece cuts or you...


let us know.

[brenzbmr@sb]

note this is for one sub.
so if you are gonna do two make a box with two chambers at 1.35 cubic ft each.

[karisma]

lol yeh i sound like an idiot, erm i dont know how to get the 1.35 cubic feet bit, so i dont know how big to make the bits of wood. Has any one on here got the time to knock me up a drawing of how it should be, where the port is best located etc, just want this box to be the best possible basically

many thanks
sean

[AVICJR]

length x width x height / 1728 is the formula to calculate in cubic feet.

14" x 13" x 13"=2366

2366/1728= 1.37 cubic feet of internal volume, or inside measurements.

[brenzbmr@sb]

right there.
now use four inch pipe and stick it on the face of box.

although you may have to play with the depth alittle to get the port to fit.

you need the back of the port to be atleast 4 inches from back of wall

this is gonna be a tight fit.

what do you listen too?

i would probably increase the box volume to about 1.75 before speaker and port.

then it will play a little lower(3db roll off) but the port will get shorter for the same tuning.

[karisma]

im learning im learning, wot is roll off

[karisma]

basically i jsut want a ported box, that is tuned or designed so that my subs sound better, and im having an spl system

[JEREMIAH]

1.35cu.ft with a 4"w 12"L port is tuned to 41hz it will sound like crap try this http://www.subwoofertools.com/forum/por ... =&Fs=&CE=0

[brenzbmr@sb]

1.35cu.ft with a 4"w 12"L port is tuned to 41hz it will sound like crap try this http://www.subwoofertools.com/forum/por ... =&Fs=&CE=0

i beg to differ, if the music he is listineng to is centered around that then it will work for him. i dont think it would sound like crap.
back in the late 80s i used to tune all my enclosures at round 45 hz
they would rock and yet still hit decent in the low end, just more authority on the upper 50 region.

was good to go since the music was around that freq anyway.


i wouldnt build that box though so i would agree with you.

if it were me i would build it about 2 cubic ft per woofer tuned at about 33 to 35 hz.

it will get decent loud and still hit some low end.

[brenzbmr@sb]

basically i jsut want a ported box, that is tuned or designed so that my subs sound better, and im having an spl system

not a problem but the question ill throw back at you is what is wrong with the way they sound now? that would help me figure out how to make them sound better..

now you want an spl system or a street beat system, there is a differnence.. spl is not gonna sound very good.

street beat is probably what you want. ie windows down and some good
bass output that actually plays below 50 hz.

gotta be more specific on what you are wanting out of the system you have.

[karisma]

being an newbie ive figureed spl isnt teh way for me, thnx for all ur help so far, it must be hard for you to help me and me not tellin u why they sound shit, erm they sjtu dont sound good at all, a bit flat you could say, theres no1 close to me that can listen to it tho and help me so im a bit stuck there,