Box size?

mikee55 · 20th April 2007, 05:17 PM

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

Cheers Mike

Ron E · 21st April 2007, 12:57 PM

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....

mikee55 · 21st April 2007, 09:23 PM

Just wandered if there was a ratio of absolute largest or smallest volume for a given design.
Cheers Mike

Ron E · 21st April 2007, 11:36 PM

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.

mikee55 · 22nd April 2007, 06:40 PM

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

Ron E · 22nd April 2007, 11:44 PM

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.

20th April 2007, 05:17 PM	#1
mikee55 diyAudio Member Join Date: Dec 2005 Location: West Howe	Box size? Hello all, how would you know the minimum and maximum box volume of either sealed or ported cabinet? Cheers Mike __________________ If it don't work, I'll fix it in the mix! Or visit http://lsdp.proboards.com/index.cgi

21st April 2007, 12:57 PM	#2
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	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.... __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

21st April 2007, 09:23 PM	#3
mikee55 diyAudio Member Join Date: Dec 2005 Location: West Howe	Hello Just wandered if there was a ratio of absolute largest or smallest volume for a given design. Cheers Mike __________________ If it don't work, I'll fix it in the mix! Or visit http://lsdp.proboards.com/index.cgi

22nd April 2007, 06:40 PM	#5
mikee55 diyAudio Member Join Date: Dec 2005 Location: West Howe	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 __________________ If it don't work, I'll fix it in the mix! Or visit http://lsdp.proboards.com/index.cgi

22nd April 2007, 11:44 PM	#6
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	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. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan


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