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Old 4th August 2011, 10:58 PM   #1
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Default Ideas on small subwoofer design

Hi all,

I have some difficulties finding the right driver for my new project.
I really hope that you might be able to help.

The project is about building a very small portable speaker set this time, in combination with an as high as possible sound quality.
As you would probably expect, the problem lies with the bass production.
I understand that a small subwoofer will never be able to produce low frequencies as well as a slightly bigger one, however my goal is to come as close as possible.

I need to fulfill these specs of the subwoofer/woofer in order to benefit from the subwoofer design:
- Outer diameter 2.0-2.5 inch (limited by design)
- 4 ohm impedance
- Xmax >= 3mm
- SPL >= 79 dB/W, 1 meter
- Power >= 5 WRMS

Especially the first parameter must lie within the given range, although I know this is a very hard to find (3-inch would have been far more easy, I know..).
So far, I only found the following subwoofer, which limits my possible design choices drastically:
- Audio dayton ND65-4

Does someone know what other loudspeakers on the market fulfill my specifications?
Or maybe any brand I should check out?

Any ideas will be deeply appreciated,

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Old 4th August 2011, 11:42 PM   #2
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Join Date: Feb 2011
a small driver can produce any frequency you want, it just can't make enough SPL to be heard in free space. A 2.5" driver at 120hz will make sound, below 80hz all you will get is motion.

How low (hz) are you trying to get.
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Old 4th August 2011, 11:56 PM   #3
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With the small design, currently about 110Hz -3dB cut-off frequency.
This can get much lower if I use a different (bigger) design.
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Old 5th August 2011, 12:36 AM   #4
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Location: San Antonio
I saw these at PE a while back, Tang Band W2-1625SA 2" Neodymium Subwoofer.
It is error only, and not truth, that shrinks from enquiry. - Thomas Paine
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Old 5th August 2011, 02:27 AM   #5
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Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.
In the PE on-line......I think these would work better TB-W3-18765 , 3" sub, Fs 55 Htz, but only 76 Db@1W/1M @ Four Ohm. At A Qtc of .707 this would be an enclosure cube at 3.12 inches internal. The two inch version runs at 90 Htz for Fs.....really too high to do any good. Plus..the 2" version is set at Appx.$45.the 3" version, $30.

__________________________________________________ _____Rick..............

Last edited by Richard Ellis; 5th August 2011 at 02:30 AM. Reason: more thoughts
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Old 5th August 2011, 01:31 PM   #6
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Thank you very much for your suggestions.
I still think the Audio dayton is the best choice considering the size.
Anyone else suggestions maybe?
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