| miguel2 |
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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| Timn8ter |
| If you have a multimeter perhaps this will help. |
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| miguel2 |
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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| Ouroboros |
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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| François |
| Speakerworkshop can also do it with added mass. |
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| Centauri |
| 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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| richie00boy |
| 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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| miguel2 |
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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