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-   -   Sub woofer (https://www.diyaudio.com/forums/analog-line-level/351932-sub-woofer.html)

Charan Raju H 31st March 2020 07:29 AM

Sorry it's a 5.25 inch driver

Mark Tillotson 31st March 2020 09:47 AM

Quote:

Originally Posted by Charan Raju H (https://www.diyaudio.com/forums/analog-line-level/351932-sub-woofer-post6141371.html#post6141371)
Sorry it's a 5.25 inch driver

This like pulling teeth...


Which exact driver are you using? Do you have all the specifications for it?

You'll need the Thiele-Small parameters if you want to design a subwoofer, and there are various web apps out there that can do the work for you, but without the data for the driver you'll be guessing wildly, and drivers differ a lot.

Charan Raju H 31st March 2020 10:01 AM

I have got 5.25 inches by measuring the drivers dia, there it has been printed as CSW 20W, 4 Ohms behind the driver and it has got dual magnets in it. These are the only specifications I have.

Mark Tillotson 1st April 2020 10:39 AM

Is it this: Cambridge Soundworks Micro Speaker 5" 4 Ohm 20 Watt Woofer | eBay

Charan Raju H 1st April 2020 11:47 AM

No not a round one. It looks like this:

ESP 5 Inch Powerful Subwoofer 4 Ohm 30 Watt 5 Inch Subwoofer 4 Ohm 30 Watt for Home Theater Subwoofer Price in India - Buy ESP 5 Inch Powerful Subwoofer 4 Ohm 30 Watt 5 Inch Subwoofer 4 Ohm 30 Watt for Home Theater Subwoofer online at Flipkart.com

The shape,looks and size are exactly same as shown in above link. But the output power of my driver is 20w.

BJosephs 1st April 2020 12:12 PM

I think what youíll soon find out is that you cannot design (nor can anyone recommend) a box without the TS parameters. Iíve never measured my own but perhaps someone here will instruct you.

Or, just build a modest sealed box and see how it sounds. Make the box as big as you can tolerate. It will make more bass than sitting on a table, not as much as a properly tuned ported enclosure, but something.

Charan Raju H 1st April 2020 12:20 PM

Fine 👍. Thanks a lot for your valuable suggestions.

PRR 2nd April 2020 02:53 AM

For the vast majority of domestic speakers: multiply advertised diameter by about 1.1. Cube that. Build a box that size. Preferably different on all three dimensions. Half fill it with wool blanket, socks, or even fiberglass. This will almost always give a Q of 0.8 to 1.6, and pretty near optimum output.

So 5.25", times 1.1, is 5.775. Cubed, is 193 cubic inches.

7" times 6" times 4.5" is 189 cubic inches.

This is NOT a precision prescription. A 4 liter box is fine. 7 inches of 6-inch drain pipe is fine.

Charan Raju H 2nd April 2020 07:30 AM

Thank you very much.
But I didn't understand what is 7 inches of 6 inch drain pipe? Is that a port dimension?

Charan Raju H 6th April 2020 10:39 AM

Can I connect the audio out of my mobile to multiple amplifier inputs?


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