Martin Audio MLA User Manual page 65

MLA System
USER GUIDE
The slot-loading allows the twin LF drivers to be optimally spaced within the enclosure. The double-source arrangement
significantly improves the directivity control of the LF section maintaining the 100 degree system beamwidth down to 250Hz and
reducing mid-bass output at the sides and rear of the array. The LF drivers themselves are very high excursion with vented poles
to reduce power compression and virtually eliminate turbulent air noise.
MLA System User Guide V2.1
65