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Old 20th April 2007, 05:17 PM   #1
mikee55 is offline mikee55  United Kingdom
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Default Box size?

Hello all, how would you know the minimum and maximum box volume of either sealed or ported cabinet?

Cheers Mike
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Old 21st April 2007, 12:57 PM   #2
Ron E is offline Ron E  United States
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Well, the minimum is zero and the maximum is whatever you can get into the space, so perhaps the question needs some clarification.

Box size calculations are covered at www.diysubwoofers.org, and the calculations hold true whether you are building a subwoofer or midrange, whatever....
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Old 21st April 2007, 09:23 PM   #3
mikee55 is offline mikee55  United Kingdom
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Default Hello

Just wandered if there was a ratio of absolute largest or smallest volume for a given design.
Cheers Mike
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Old 21st April 2007, 11:36 PM   #4
Ron E is offline Ron E  United States
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Default Re: Hello

Quote:
Originally posted by mikee55
Just wandered if there was a ratio of absolute largest or smallest volume for a given design.
Cheers Mike
Nope. Volume is determined by the specifications of the driver and the response you want. It will be easier to answer your question if you give a little background as to how you decided to ask it.
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Old 22nd April 2007, 06:40 PM   #5
mikee55 is offline mikee55  United Kingdom
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Default Hello Ron E

I just want to know if I made a box for a 15", what limit I would have with the dimensions?

If I made it 100 litres it would be okay, if I made it 500litres would that be okay, too?

Cheers Mike
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Old 22nd April 2007, 11:44 PM   #6
Ron E is offline Ron E  United States
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For a sealed box, rather than thinking about size, think about Qtc.

A Qtc of:
0.5 to 0.65 is low
0.65-1 is typical
1-1.3 is high, but tolerable
1.3+ is getting into the "quite boomy" region

For vented boxes, if the response has any peaking, it will tend to sound boomy. The sharper and higher the peak, the boomier.

The bigger you make the box, the less the power handling at low frequencies will be.
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