Listen to them both. An "equivalent" floorstander and standmount will always be different, From experience, the d18 is turning out to be stunning, the clarity and precision of the mid / upper midband is incredible. These are the first speakers that are significantly more revealing than any phones I have heard, but they are also wonderfully integrated, the bass guitars of tracks are playing with the band and not just a low frequency noise. I'm sure the D2s will have a similar tonality, but without the depth of bass.