1. Effectively (up to) twice the 'real' power of the amplifiers themselves, as nothing is lost in the crossover components
2. Reduced intermodulation distortion
3. Elimination of the low frequency passive crossover, its inherent losses, potentially poor linearity and crossover point inaccuracy
4. Reduction of the difficulty of the load presented to the power amplifier
5. No padding is required to align the driver sensitivities, so we are not simply wasting power, and we can choose the speakers based on what we need
6. The damping factor is greatly improved for both the low and midrange loudspeakers
7. Complete freedom from any interaction between the loudspeaker driver (and its environment) and the crossover network
8. Cost savings, since complex passive crossover networks are not needed. And with a line array they are very complex.
9. Tri-wiring is included free!
10. The flexibility to choose amplifiers which are at their best within a defined frequency range--as I did for each section of the array
11. Ability to match amplifier power to the exact requirements of the drivers for maximum overall efficiency