L-Acoustics K2 PA system has been used for the Womad Festival this year. It was supported by KS28 Subs and KARA with ARCS Wide as a front fill.
Sub configuration is a combination of both: Centre ARC Sub Array and stacked Cardioid Out Fill with the bottom sub reversed. Cardioid mode in this configuration helps to minimize interference between Centre and Out Fill sub arrays. As a result, summation of all subs and coverage in this configuration smoother and no much delay needed to the Out Fill subs. This makes perfect phase relationship between Out Fill Sub, Centre Sub arrays and flown K2 which is very important for the final result. Below is the Soundvision calculation for this Sub configuration.
This is obvious, that using Cardioid Out Fill Sub configuration makes much easy to achieve even coverage and phase relationship between all components of the system: