SLA CurveArray Dispersion

For livingroom sound better than in a theatre.
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Bill Fitzmaurice
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SLA CurveArray Dispersion

#1 Post by Bill Fitzmaurice »

In case you’re wondering why the SLA CurveArray is cross fired, it gives the widest possible dispersion with the least amount of comb filtering from a horizontal array of drivers. In these pictures the green areas are where the outputs of three drivers constructively combine. The red areas are where they don’t, leading to comb filtering, where response has alternating peaks and dips across the sound field. The flat baffle has moderate dispersion, and moderate comb filtering. The outward splayed baffle has wider dispersion, but it also has far more comb filtering. The cross firing baffle has as much dispersion as splayed, but with less comb filtering. Note that with sufficient distance the comb filtering disappears, so if you get far enough away a splayed array will work. But that may be anywhere between a few feet and a hundred feet or more, depending on frequency/wavelength.

Image

The same physics apply to the cross firing melded tweeter arrays in the DR series, and the cross firing XF guitar cabs. It also applies to commercial trapezoidal PA cabs. It’s why we don’t do them. If you’re stuck having to use trapezoidal cabs either stack them vertically or cross fire them. They won’t work nearly as well as cabs designed for vertical stacking like ours, but it will still be better than splayed.

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