Fir Crossovers - Martin Audio MLA User Manual

MLA System
USER GUIDE
HF array cutaway showing "wedge"waveguide
By suitable choice of the length and shape of this wedge, the overall curvature of the exiting wavefront is accurately and
specifically optimised to meet our new wavefront curvature criteria – neither flat nor excessively curved.
Conventional horn, curved wavefront MLA horn with wedge, optimised curvature
* Patent Application WO2007054709

FIR Crossovers

Like all three-way systems, MLA's low, mid and high frequency sections are combined by a crossover. Up to now, Linkwitz-Riley,
4th order filters have been the industry standard. With traditional filters like these, overlap at crossover can result in a non-
symmetrical horizontal polar pattern if the devices being crossed-over are side by side.
In the theoretical opposite extreme, a brick-wall filter would completely eliminate overlap, and the polar pattern would be
unaffected and symmetrical.
MLA System User Guide V2.1
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