Hi,
If I understand your confusion correctly, you want to know how things work with three Aktiv stereo amps running the two way Ninka's that have two mid/bass drivers per speaker. The crossovers in the back of the Ninka's need to have the jumpers configured correctly for this application. Once that is done, each driver in each speaker (total of six) will be driven by an Aktiv channel of an amp. You are correct that it takes three amps (one stereo treble and two stereo mid/bass) to tri-amp Aktiv. This should represent the best possible performance for the Ninka's since nothing in the speaker crossover will function except the pass through.
If I understand your confusion correctly, you want to know how things work with three Aktiv stereo amps running the two way Ninka's that have two mid/bass drivers per speaker. The crossovers in the back of the Ninka's need to have the jumpers configured correctly for this application. Once that is done, each driver in each speaker (total of six) will be driven by an Aktiv channel of an amp. You are correct that it takes three amps (one stereo treble and two stereo mid/bass) to tri-amp Aktiv. This should represent the best possible performance for the Ninka's since nothing in the speaker crossover will function except the pass through.