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I've just done a bit of reading on some simple loudspeaker design in my textbook. It is asking me to calculate when the first minimum occurs. I think I am fine with this, but my problem is that I have no idea how I would calculate the angle at which the minimum occurs.

I will use an example given in the book. The sound frequency is 0.14 m and this is emitted by a loudspeaker of diametre 0.15 m.

I am using the equation:

[tex]sin\theeta=\frac{\lambda}{b}[/tex]

I would therefor say that the first minum occurs at [tex]\frac{0.14}{0.15}=0.93 \degrees[/tex]

The book however says that the angle at which the minimum occurs is about 69 degrees. Could someone please clear this up, it is probably a misunderstanding of some sort. I have not offered working as I do not know the method in solving this, but any help would be great.

Thanks.

_Mayday_

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# Loudspeaker Design

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