Diy sub -3 point?

Toast_Master · 21st May 2006, 01:17 PM

when measuring a finished diy subwoofer

, how do you determine the -3 frequncy point on my graphs?

thanks in advance

RobWells · 21st May 2006, 08:49 PM

Measure it outside, away from buildings. It should look fairly flat then roll off at the bottom end. When the plot is 3dB down, well, thats your F-3.

Rob.

Toast_Master · 22nd May 2006, 02:18 AM

Yeah but, where I might get -3, might be actually +3 if you know what i mean.....like where do I rule the line to say

RobWells · 22nd May 2006, 06:05 AM

plot a line straight through the average of all the little peaks / troughs.

Rob

See what Linkwitz does:

http://www.linkwitzlab.com/models.htm

21st May 2006, 01:17 PM	#1
Toast_Master diyAudio Member Join Date: Apr 2006 Location: Tasmania, Launceston	Diy sub -3 point? when measuring a finished diy subwoofer, how do you determine the -3 frequncy point on my graphs? thanks in advance

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21st May 2006, 08:49 PM	#2
RobWells diyAudio Member Join Date: Aug 2002 Location: UK	Measure it outside, away from buildings. It should look fairly flat then roll off at the bottom end. When the plot is 3dB down, well, thats your F-3. Rob.

22nd May 2006, 02:18 AM	#3
Toast_Master diyAudio Member Join Date: Apr 2006 Location: Tasmania, Launceston	Yeah but, where I might get -3, might be actually +3 if you know what i mean.....like where do I rule the line to say

22nd May 2006, 06:05 AM	#4
RobWells diyAudio Member Join Date: Aug 2002 Location: UK	plot a line straight through the average of all the little peaks / troughs. Rob See what Linkwitz does: http://www.linkwitzlab.com/models.htm

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