Hadfielding:
You will require two identical mid/bass active cards for two of your LK 140 amps and one treble active card for your third LK 140 amp. The Ninka is a TWO WAY speaker. It might have three drivers per speaker, but it is only a two way speaker. If it was a three way speaker then yes it would need a separate mid range active card.
Bunkers
You will require two identical mid/bass active cards for two of your LK 140 amps and one treble active card for your third LK 140 amp. The Ninka is a TWO WAY speaker. It might have three drivers per speaker, but it is only a two way speaker. If it was a three way speaker then yes it would need a separate mid range active card.
Bunkers