Subwoofer design with unknown driver - diyAudio
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Old 5th February 2004, 11:19 AM   #1
miguel2 is offline miguel2  Portugal
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Default Subwoofer design with unknown driver

Hi,

I have a 12" driver that I think it is from Phillips (an old one). I am using it with the Pass design El-Pipe O, with good results. But now I having trouble in puting that big ugly tower in the living room, you know why dont you .
So I though of using the driver in a box or something like that. But the problem is that I dont have any specs. Is there any decent way to do it?

Miguel
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Old 5th February 2004, 01:14 PM   #2
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If you have a multimeter perhaps this will help.
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Old 5th February 2004, 01:19 PM   #3
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SpeakerWorkshop works great to measure speaker parameters.
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Old 11th February 2004, 10:37 AM   #4
miguel2 is offline miguel2  Portugal
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The problem is that if I understand correctly, I must have a box to measure Vas. So I would have to build one to get that and then build another one...
Is there a way to go round this?

Miguel
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Old 11th February 2004, 11:08 AM   #5
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You can get a reasonable measure of Vas by adding a known mass to the cone and measuring the new (lower) resonant frequency.

There's a site with a spreadsheet on it to calculate the parameters using this method.

I've forgotten the URL though. I could email you the spreadsheet if no-one comes up with the website details.

Chris Morriss.
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Old 11th February 2004, 12:35 PM   #6
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Speakerworkshop can also do it with added mass.
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Old 11th February 2004, 12:59 PM   #7
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Quote:
Originally posted by miguel2
I must have a box to measure Vas. So I would have to build one to get that and then build another one...
Is there a way to go round this?

If you do use the box method, it certainly doesn't have to be a flash box. Offcuts of timber are good for this and it can be slapped together fairly quick as long as you get it sealed, and know the internal volume.

Cheers
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Old 11th February 2004, 01:08 PM   #8
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Quote:
The problem is that if I understand correctly, I must have a box to measure Vas. So I would have to build one to get that and then build another one...
Is there a way to go round this?
Yes. And don't bother faffing around adding mass and measuring Fs again, it's a pain. Use the BL method, a quick search should reveal it, failing that it's fully explained in Vance Dickason's Loudspeaker Cookbook.
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Old 11th February 2004, 05:11 PM   #9
miguel2 is offline miguel2  Portugal
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Does Speaker Workshop needs an amplifier in between the sound card and the driver or is it a direct connection with the 10R resistor only? How important is the power rating of the resistor?

Miguel
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