diysubwoofers.org - effective diameter from Sd

Dave Jones · 30th May 2004, 10:37 PM

Am I nuts, or is the formula wrong?

http://www.diysubwoofers.org/prd/

(Admittedly, the formula could be wrong and I'm nuts too.)

Isn't Sd the effective cone area? In that case, the effective diameter is 2 x sqrt(Sd/pi), right?

johninCR · 30th May 2004, 11:21 PM

I think you're right. Pi R squared is the area of a circle last time I checked. Drop Brian a note.

Dave Jones · 30th May 2004, 11:35 PM

Quote:

Originally posted by johninCR
I think you're right. Pi R squared is the area of a circle last time I checked. Drop Brian a note.

Done.

sreten · 31st May 2004, 10:27 AM

Sd = pi x Rsquared so Rsquared = Sd/Pi, R = root(Sd/pi).

I can't see where this is claimed to give the effective
diameter, it clearly states this is the effective radius.

sreten.

johninCR · 31st May 2004, 12:21 PM

Thats because Brian already changed it.

30th May 2004, 10:37 PM	#1
Dave Jones diyAudio Member Join Date: Jul 2003 Location: Silicon Valley	diysubwoofers.org - effective diameter from Sd Am I nuts, or is the formula wrong? http://www.diysubwoofers.org/prd/ (Admittedly, the formula could be wrong and I'm nuts too.) Isn't Sd the effective cone area? In that case, the effective diameter is 2 x sqrt(Sd/pi), right? __________________ Davy Jones

30th May 2004, 11:21 PM	#2
johninCR diyAudio Member Join Date: Apr 2004 Location: Costa Rica	I think you're right. Pi R squared is the area of a circle last time I checked. Drop Brian a note. __________________ Everyone has a photographic memory. It's just that most are out of film.

31st May 2004, 12:21 PM	#5
johninCR diyAudio Member Join Date: Apr 2004 Location: Costa Rica	Thats because Brian already changed it. __________________ Everyone has a photographic memory. It's just that most are out of film.

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31st May 2004, 10:27 AM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Sd = pi x Rsquared so Rsquared = Sd/Pi, R = root(Sd/pi). I can't see where this is claimed to give the effective diameter, it clearly states this is the effective radius. sreten.

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