Thanks for the recommendation. I was surprised that I missed it or maybe I stumbled across but failed to include it in my list. It is quite interesting that Stereophile compared it fairly with the Dynaudio Confidence C1 (which is high on my list) sonically but at a less than half price. I will explore that option.
It seems that I am wrong about S40 this time since not only you but also others attest there is no midrange congestion issue with it. Will resume the exploration or even a quest on it. Its red birch high gloss finish is simply stunningly gorgeous.
@m-db
This might be another long-debate subject and I do not intend to open the deep discussion on this. I have seen different advocates for the sub. placement. Some people said the corner is the worst but the well-known REL lead designer John Hunter advocates for it. You mentioned by the main speaker is the worst but I have seen others end up with it being the optimal location which also makes sense to me. That is the location I have experimented and chosen after hours of moving it around. Admittedly the issue can be further mitigated or addressed with modern DSP technology but I guess the optimal location is still room dependent.
My point is that, even you have settled with the "optimal" placement, the speed and texture from a separate sub. controlled by its built-in amplification can not be easily matched / integrated with the main speakers controlled by your system amplification. When listening to the music having quick bass tempo, that disparity in speed and texture of tone bet. them just severely bother me. Sandy Gross who has already retired from Golden Ear mentioned it is almost impossible to seamlessly integrate them and they chose built-in subwoofer design instead.