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 Multi-Way Conventional loudspeakers with crossovers

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 1st October 2007, 08:33 PM #1 weinstro   diyAudio Member     Join Date: May 2003 Location: N. Cal Quick nooby questions Hi All, 1. Can anyone confirm/deny that Unibox models an anechoic response? 2. Is it correct to assume that Unibox ignores baffle step correction? 3. With respect to baffle step correction, I've heard refence to 2pi and 4pi radiation patterns. Last I checked 2pi radians = 360 degrees, which is a full circle. What do 2pi and 4pi refer to? My guess would be volume, but in what way I do not know. Thanks!
Svante
diyAudio Member

Join Date: Feb 2004
Location: Stockholm
Re: Quick nooby questions

Quote:
 Originally posted by weinstro Hi All, 1. Can anyone confirm/deny that Unibox models an anechoic response? 2. Is it correct to assume that Unibox ignores baffle step correction? 3. With respect to baffle step correction, I've heard refence to 2pi and 4pi radiation patterns. Last I checked 2pi radians = 360 degrees, which is a full circle. What do 2pi and 4pi refer to? My guess would be volume, but in what way I do not know. Thanks!
Now I'm no expert on Unibox, but I think it models anechoic response and that there is no baffle step. I might be wrong.

The 2 pi and 4 pi are angular space (is that the proper english word?). It corresponds to the area of the part of the sphere at a unit distance. Full space corresponds to a the area of a sphere with the radius 1, ie 4 pi. A half sphere has the area 2 pi, etc.
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weinstro
diyAudio Member

Join Date: May 2003
Location: N. Cal
Re: Re: Quick nooby questions

Quote:
 Now I'm no expert on Unibox, but I think it models anechoic response and that there is no baffle step. I might be wrong.
Me, too.

Quote:
 The 2 pi and 4 pi are angular space (is that the proper english word?). It corresponds to the area of the part of the sphere at a unit distance. Full space corresponds to a the area of a sphere with the radius 1, ie 4 pi. A half sphere has the area 2 pi, etc.
Does area = surface area, in this context?

Thanks!

Svante
diyAudio Member

Join Date: Feb 2004
Location: Stockholm
Re: Re: Re: Quick nooby questions

Quote:
 Originally posted by weinstro Does area = surface area, in this context?
Yes, the surface area of the part of the sphere at unit distance from the origin that is exposed to sound.

"Solid angle" is the english word for it, it suddenly occured to me.

http://en.wikipedia.org/wiki/Solid_angle
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 2nd October 2007, 05:43 PM #5 sreten   R.I.P.   Join Date: Nov 2003 Location: Brighton UK Hi, I'm no expert on Unibox either but all bass end only software I've seen ignores baffle step but gives output into 2pi not 4pi. That is a 90dB driver is not reduced to 84dB due to 4pi loading. /sreten.
Svante
diyAudio Member

Join Date: Feb 2004
Location: Stockholm
Quote:
 Originally posted by sreten I'm no expert on Unibox either but all bass end only software I've seen ignores baffle step
Hehe, isn't that more or less the definition of "bass end only"?

...sorry, I could not help myself.
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 3rd October 2007, 06:41 AM #7 weinstro   diyAudio Member     Join Date: May 2003 Location: N. Cal Thanks for the insights, guys!

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