i tried the S2 X with a sub 8 (witch was more than enought in my room) it's an exellent combo ,and i always prefered having a sub (that you can move and tweak level wise and phase wise) to get the problem sorted easier that a big 3 way near a wall !! for exemple .... also add to this that the medium on the s2x will be even better since on the sub you will exclude like for exemeple everityhning from 85 hz to zero from the S2X ...

That said i tested the Quested 2108 , and the quested stayed .... lol not the S2X .... (i was moving from a P11A + Sub 8 combo , i always found that the P11A were one of the best Adam ever made)