what differentiates in 2/12 way and 3 way speaker ?

kr4 thank you for your explanation

kr4, my speaker have one tweeter, one mid and 2 bass identical, Ar my speaker the 31/2 way or 21/2 way ?

kr4, speakers are ML 60 xti.

kr4, from audio advisor, it is a 21/2 way ?  

Low-Mounted Woofers Minimize Floor Bounce

Floorstanding Motion models utilize 2.5-way designs that feature woofers positioned low in the cabinet and close to the floor. This deliberate design addresses a phenomenon known as floor bounce where sound reflected off the floor (from drivers positioned high on a cabinet) and sound aimed directly at the listener interfere with each other. Without addressing these issues, listeners would experience bloated bass and massive increases and decreases in sound levels throughout critical midrange frequencies.