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Materials for cylindrical subwofers ?
Materials for cylindrical subwofers ?
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Old 4th August 2018, 03:27 PM   #1
academia50 is offline academia50  Argentina
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Default Materials for cylindrical subwofers ?

I have some doubts about the resonant properties of the different materials that I could use.

Cardboard (the classic Sonotube)

Aluminum

PVC

I have not found any construction with PVC pipes, is there any problem with this material ?

I attach some links.

Product Review -

Do the sonotube subwoofers sound good? - Home Theater Forum and Systems - HomeTheaterShack.com

How to Make a DIY Cylinder Subwoofer (AKA Sonosub) | Spinditty


Any information about it will be greatly appreciated
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Old 4th August 2018, 03:41 PM   #2
eduard is offline eduard  Netherlands
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Hello,
The French did do some test with sand filled enclosures. It appears that if you want the sand to work the enclosure should not be to thick so it will vibrate BUT then this vibration will be stopped by the sand.
So if you could find two pvc tubes with different diameters so you can have like 2 or 3 centimeters of sand in between that could work perfectly.
The problem is probably finding these tubes!
Greetings. Ed
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Old 4th August 2018, 03:49 PM   #3
DonVK is offline DonVK  Canada
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Both sonotubes and sewer pipes can be used. The rolloff edges are not as sharp as a box design, probably because of wall flex along the length of the tube. They look unusual and sound good.

SonoTube and SewerPipe BP6 Subwoofer
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Old 4th August 2018, 03:50 PM   #4
TBTL is offline TBTL  Germany
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If you can get the resonance frequencies of the enclosure walls several octaves above the upper frequency of the subwoofer then ringing is no problem.
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Old 4th August 2018, 05:15 PM   #5
reloader650 is offline reloader650  United States
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Default PVC.

Hi academia,

PVC pipe works great. I have made several subwoofers using PVC. Here is one that I started last year.Two LAB12s and PVC pipe build.. I recently removed this sub to go in a different direction.
Still going to use PVC pipe, but will go back to a closed box again. I should add that the 14" schedule 40 pipe that I'm using is expensive, all of the pipe was free to me from dumpster diving .

Regards,
Matt
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Old 4th August 2018, 11:18 PM   #6
academia50 is offline academia50  Argentina
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Quote:
Originally Posted by eduard View Post
Hello,
The French did do some test with sand filled enclosures. It appears that if you want the sand to work the enclosure should not be to thick so it will vibrate BUT then this vibration will be stopped by the sand.
So if you could find two pvc tubes with different diameters so you can have like 2 or 3 centimeters of sand in between that could work perfectly.
The problem is probably finding these tubes!
Greetings. Ed

Hello Eduard

Good solution, fill with sand between different diamentros of tubes .... but the cost goes up and the work increases.
It seems that I get 2.8 mm thick tubes here, that's very thin ......
For my 18-inch speaker the tube would be 0.60 meters in internal diameter x 1 meter in height. I think with some internal reinforcements it could work.

Something like that :
Attached Images
File Type: jpg Subwofer cilindrico.jpg (415.3 KB, 331 views)
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Old 4th August 2018, 11:23 PM   #7
academia50 is offline academia50  Argentina
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Quote:
Originally Posted by DonVK View Post
Both sonotubes and sewer pipes can be used. The rolloff edges are not as sharp as a box design, probably because of wall flex along the length of the tube. They look unusual and sound good.

SonoTube and SewerPipe BP6 Subwoofer

Hello DonVK


Yes, the problem is the flexion of the walls ...

I think aluminum is rigid, but how often will it resonate?

The subwofer will be sealed .....
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Old 4th August 2018, 11:28 PM   #8
academia50 is offline academia50  Argentina
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Quote:
Originally Posted by TBTL View Post
If you can get the resonance frequencies of the enclosure walls several octaves above the upper frequency of the subwoofer then ringing is no problem.
I want to use the sub for music mainly, it will not go above 100 hertz ...

I have simulated with WinIsd and I have decided that it will be 140 liters for a Q 0.707
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Old 4th August 2018, 11:29 PM   #9
Richard Ellis is offline Richard Ellis  Argentina
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Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.
If you have the appropriate gear, you could always record yourself striking the prospective tube & scan the audio signal with an oscilloscope & note the frequencies?



-----------------------------------------------------------------------Rick........
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Old 4th August 2018, 11:33 PM   #10
academia50 is offline academia50  Argentina
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Quote:
Originally Posted by reloader650 View Post
Hi academia,

PVC pipe works great. I have made several subwoofers using PVC. Here is one that I started last year.Two LAB12s and PVC pipe build.. I recently removed this sub to go in a different direction.
Still going to use PVC pipe, but will go back to a closed box again. I should add that the 14" schedule 40 pipe that I'm using is expensive, all of the pipe was free to me from dumpster diving .

Regards,
Matt
Hi Matt

Well, I wish I could have that luck !

That is a tube with very thick walls !
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