A Model of Open-Baffle Loudspeakers - DIY Audio Projects
A Model of Open-Baffle Loudspeakers - DIY Audio Projects
A Model of Open-Baffle Loudspeakers - DIY Audio Projects
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Figure 10. The parameters describing the average distance from the edge.<br />
For a rectangular baffle the distance can be written as<br />
Equation 13 r(0) = & ,<br />
where r, is the distance from the edge under study and 8 the angle calculated for that particular<br />
edge. If the edge is delimited by angles 8,,, and 0,,, then the average distance is<br />
Equation 14<br />
Taking the uppermost edge as an example, the minimum and maximum angles for an edge can be<br />
defined from the geometry <strong>of</strong> the baffle as<br />
Equation 15<br />
X0<br />
%in = -arcsin<br />
x0” +Y;<br />
0 = arcsin Xl ’<br />
max<br />
x: +Y:<br />
from which the average distance for this particular edge can be written as<br />
Equation 16 rave, r =<br />
1<br />
11<br />
Xl X0<br />
arcsin + arcsin<br />
xf +yo2 4 +Yo2<br />
Repeating this for other edges yields the total average distance, from which can be computed the<br />
estimate for the on-axis sound pressure at distance r<br />
. 2<br />
Equation 17 p = zp~~~<br />
13
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