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Old 29th July 2004, 09:25 AM   #1
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Default Please check my subwoofer design

I am planning on building an Adire Shiva into a 190 litre enclosure tuned to 19hz. I have modeled it in lsp cad and get a -3db of a hair under 17hz. Can anyone see any potential problems with this design (it is my first)?
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Old 29th July 2004, 07:08 PM   #2
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Only the over excursion (exceeding Xmax) in the ~20-33Hz BW, but I wouldn't be overly concerned unless you like to really 'crank it' on movie special effects or organ tracks, then you will need dual drivers/PRs.

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Old 30th July 2004, 07:30 AM   #3
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Short of changing driver (another one might be possible in the long term), if it is a problem, what should i do? The only thing i can think of is raising tuning frequency a bit.

How much do you mean by crank it? My room is 4.5x4 meters so i should be able to get good volume without the need for a bigger/more drivers?
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Old 30th July 2004, 06:19 PM   #4
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>Short of changing driver (another one might be possible in the long term), if it is a problem, what should i do? The only thing i can think of is raising tuning frequency a bit.

====

Correct, though if you do then either reducing Vb or additional stuffing will be required to damp the peaking at Fb.

====

>How much do you mean by crank it? My room is 4.5x4 meters so i should be able to get good volume without the need for a bigger/more drivers?

====

Drive it beyond Xmax, which is already defined as 10% distortion.

If the room is fairly well built/sealed, then I doubt it will be an issue.

Long term, I recommend either building a multiple low Qts/inductance annulled driver IB, or at least an EBS version, to get better damping/lower distortion.

For now though, time to build!

GM
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