Can someone punch these numbers into a good enclosure program for me? - diyAudio
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Old 7th January 2005, 01:07 AM   #1
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Join Date: Jan 2002
Location: Spfld, OR
Default Can someone punch these numbers into a good enclosure program for me?

If I am putting the 2x3 Tang Band full range driver with these parameters:

Fs: 150 Hz *SPL: 88 dB 2.83V/1m *Vas: .03 cu. ft. *Qms: 7.29 *Qes: .54 *Qts: .50


Into a tiny little enclosure with these dimentions:

3 1/4" H
2 1/16" W
3 3/8 D


Is there a recommendation for a little port I can put on the back of the enclosure or something to release a little pressure? I know this isn't the ideal enclosure by any means, but bear with me. They seem to be making a voice-coil related buzzing noise at higher volume levels even when they are not moving too much, and it seems to me that the small enclosure might be causing pressure on the back of the cone. My other thought is that the little bit of stuffing I put in might be creeping back out of the enclosure and touching the back of the cone, but it seems unlikely that it would be doing that on 3 of them.

Let me know what you think.
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Old 7th January 2005, 01:53 AM   #2
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Join Date: May 2004
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I think that you're overdriving them. If you're feeding them a full range signal I'm sure of it. A port would make things worse by allowing the cone to move more freely. These are incapable of any bass response and feeding them anything below 150 Hz will be a problem.
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Old 7th January 2005, 02:11 AM   #3
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Funny you mentioned that, because I forgot to mention that they are already crossed over at 150hz. I know that is not the problem, because they Don't need to be pushed really hard to make it happen.
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Old 7th January 2005, 03:48 AM   #4
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Location: Connecticut, The Nutmeg State
Assuming those are inside dimensions, you are at 22.6 cu inches.

That is .013 cu ft.

Let's see where we go from there.
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Old 7th January 2005, 03:59 AM   #5
Wizard of Kelts
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Well, here is the response plot for one Tangband 2 X 3 inch drivers in the box you described-0.15 cu ft.

Basically, the response looks fine. And the driver is in a box half it's VAS-I would not think back pressure is the problem. The final Qtc of this drivr in that box is a normal 0.87.

You might try crossing over a little higher than 150 Hz, though.

Actually, this graph is only slightly off-I modelled 0.015 cu ft, instead of 0.013 cu ft, which is what your enclosure is. Very little difference, however.
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File Type: gif tangband 2 x 3 full range.gif (4.3 KB, 105 views)
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Old 7th January 2005, 04:53 AM   #6
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Hmmmm, I'll cross them over at 200 and see what that does.
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