building a sonotube from the parts from a 12 inch partsexpress sub

[michelevit]

I have a 12 inch downward firing partsexpress subwoofer
and i would rather have a sonotube design.

what is the best way to figure out the design for building
the sonotube sub? i want a sonotube because
its smaller footprint should fit behind my couch.

anyadvice would be greatly appreciated. i am looking to
use the driver and amplifier from the partsexpress
sub.

thanks again and i have learned a great deal from just lurking
here.

[preiter]

As far as I know, a Sonotube subwoofer is just a subwoofer that uses a Sonotube in its construction. It can still be sealed, ported or a transmission line. That's the first decision you need to make.

[auplater]

here's a 12" partsexpress Titanic MkII sonosub from ~2001

The hardest part of building is the endcaps, I turned mine on a Shopsmith lathe, but with a large sander you can clean up a jigsaw cut, or you can make a circle template for a router and cut them...

[michelevit]

i'm pretty good with woodworking and my questions are
more towards how do i determine the dimensions of the sonotube?

there must be a formula where you enter the driver charectoristics
and you end up with the tube diameter, length, port diameter
and lenghth.

that is what i am looking for.

thanks again.
my searching skills are not turning up with much.

any recipes on line?

[Mikey p]

You enter the subs characteristics into a sub modelling program to determine the volume needed. (WinISD comes to mind). Then you use the sonotube calculator to determine the diameter and length of tube that you need.
http://www.quux.net/roo/diy/sonosub/sonocalc.html

[badman]

win isd
bass box
any number of online calculators
www.google.com

There's a TON of information out there. The volume of a sonotube is 3.14159 X (inner diameter/2)^2 X height.

[michelevit]

thanks- that was exactly what i was looking for.
thanks again.

[TheWacoKid]

You design the enclosure just like you would any other ported/sealed/TL/bandpass. Then you just build the sonotube enclosure with the correct volume/tuning/port area/etc.

[auplater]

Originally posted by michelevit
i'm pretty good with woodworking and my questions are
more towards how do i determine the dimensions of the sonotube?

there must be a formula where you enter the driver charectoristics
and you end up with the tube diameter, length, port diameter
and lenghth.

that is what i am looking for.

thanks again.
my searching skills are not turning up with much.

any recipes on line?

Heres an excel spreadsheet for this sub... you can replace the params with those for your 12 incher (for the sealed version) and the ported version

[Cameron Glendin]

I recently built a sonotube 12 inch sub that would be described as TL, it was pretty simple, 1/4 wavelength of 33 hz (driver resonence) is aprox 8 feet. I simply siliconed the driver to the tube and filled with dampening material. As I cross over low aprox 60 hz there is no need to place the driver 1/5 length of pipe. It sounds fantastic.
I then installed an 18 inch 98db driver in a 10 ft sonotube, fiberglass fill in a 250 seat cinema. The staff and customers seem to love it.

I have been told that a reponse from 22 hz can be expected but do not understand why.