AP-93 is 2*2 : 2 ( 2 Tx Antennas , 2 Rx Antennas & 2 Spatial streams )
AP-105 is 3*3 : 3 ( 3 Tx Antennas , 3 Rx Antennas & 3 Spatial streams )
I know that MIMO is seding multiple streams at same time , so i cann't see difference between MIMO & Spatial streams ?