View Full Version : Anyone ever calculate the exact displacement of a full length 6'' PSP AeroPort?

av8ter

01-02-2010, 01:02 AM

I am about to design a box 2 15'' RE HCs and would like to get to 8 cubes, 30hz, after displacements using two full length 6'' PSP AeroPorts but I am having trouble calculating displacement.

Anyone ever run a calc for this or have any guidance?

Help will be very much appreciated.

Thanks,

Kevin

ciaonzo

01-02-2010, 01:44 PM

http://www.subwoofer-builder.com/port-flares/effective-length.gif

SicAudio

01-02-2010, 01:46 PM

Cianzo on the ball as always ;)

http://www.psp-inc.com/tools.html

Toxic Tuan

01-02-2010, 02:22 PM

I believe he's asking for the volume of displace of the actual port.

Tuan

SicAudio

01-02-2010, 02:28 PM

r2 x pi x length / 1728 = cf ;)

kodak314

01-02-2010, 02:30 PM

r2 x pi x length / 1728 = cf ;)

this

Toxic Tuan

01-02-2010, 02:33 PM

r2 x pi x length / 1728 = cf ;)

That isn't exact displacement. You have to take the integral of the curve and rotate it around the z axis to get the precise displacement.

I have the exact number but I misplace it somewhere. It's been 3 years since I've designed something with it.

Tuan

SicAudio

01-02-2010, 02:35 PM

the extreme minor .000004579 cf dif will not make a bit of difference tho lolz

Pioneer~Saturn

01-02-2010, 02:37 PM

Yea, the displacement of the aero as if it were a normal, round port would be close enough because it'd be such a small amount off on airspace if you really wanted to factor in the flared portion

av8ter

01-02-2010, 02:45 PM

Ok. Thanks everyone. Makes sense now.

michaellane

01-02-2010, 02:47 PM

.35 is what partsexpress told me

michaellane

01-02-2010, 02:49 PM

About .3 cubes

smart man

smart man

You gotta know how to do this if you design boxes.

pi*r*r*length*number of aeros/1728

michaellane

01-02-2010, 02:54 PM

pi*r*r*length*number of aeros/1728

outtaa my league

SicAudio

01-02-2010, 03:03 PM

r2 x pi x length / 1728 = cf ;)

pi*r*r*length*number of aeros/1728

x's 2 lolz

Toxic Tuan

01-02-2010, 03:40 PM

the extreme minor .000004579 cf dif will not make a bit of difference tho lolz

The difference is much bigger than that. I guess some of us are perfectionists. There are 4 variables that can never be dead on in an enclosure. Little things add up.

Tuan