Does FIRmaker optimization with only one FIR channel per cabinet work in practice?
It certainly does! — Field tests (some of which have already been published by AFMG) indicate that substantial performance improvements can already be achieved when using only one FIR channel per cabinet. The explanation is simply that the sound waves in the mid-frequency range have wave lengths of the order of the cabinet spacing in typical line arrays. It is not necessary to have a much higher resolution than that.