room space


I have a living room in apartment with listening space of 4m (from listening coach to front wall where speaker stands) x 6m wide with the height of 3m.  I am planning to purchase a 2nd hand Dynaudio Contour 3.3. But I am afraid that such kind of not so large space, the bass might cause standing waves which make bass unclear or vibrating the floor which cause down floor inhabitants complain.  Do you have any idea for my condition? Or should  I buy a smaller one such as Contour 1.8 MK II? Tks. in advance.  
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"We have Focal here which might be the another sister brand of JM Labs. The new Focal costs a lot for the high End models. In now days, you can't image why the hi-end is so expensive."

I think Focal is the right name. It used to be JM Labs made the finished speakers you go buy in an audio store and Focal just made raw drivers. I believe the 2 companies merged and they now call everything Focal. In the US they have some very expensive speakers, but they also have models that are very reasonable, and you can often find them on sale and get even better prices. But if you don't have any of these brands available to you, try the Dynaudio as long as you can sell them and not lose much money if they don't work. I would get the bigger of the 2 pairs (the 3.3's). You're less likely to have an issue with them. 

some one else may be able to answer this better but would a speaker designed for corner placement be better suited for your room.
that doesn't seem like what I would call a small room. I think you should be fine. 
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One thing that would concern me is the height of the 3.3's woofers in that size room. When there are two woofers and their dimensions from the floor are approximately the same as the distance from the side walls, that tends to throw off the in-room response in the upper bass and into the midrange.