It's only 3-way for marketing. This is purely a classic "2.5-way", doesn't matter if the drivers are active driven with their own amps. Your description is wrong and confusing, there is no single "sub", both
the woofers play down to 50hz.
This is better described even on the product page itself (Tech talk):
Active nearfield studio monitor with two 5'' SilverCone honeycomb-structured woofers, AMT RS3 ribbon tweeter, DSP control, 3 x 50W PWM amplifiers, one-knob operation.
Again, which describes a 2.5-way speaker which as a concept is described similarly on a million google results.