Martin Audio WLXGS User Manual page 20

Again, a flexible side wall may absorb sound at certain low frequencies. Boundaries should always be treated
with caution.
Spacing
It is possible to space out WLX or WLXGS subwoofers to provide a larger frontal area with fewer units but
care must be taken to avoid irregular coverage at higher, mid-bass frequencies.
The following formula gives the pressure ratio p(h) (wrt to the on-axis pressure) for any off-axis angle of a
regularly spaced linear array:
All material © 2007. Martin Audio Ltd. Subject to change without notice.