Thank you all. It's me again, coming back with some useful info. I tried several speakers at a local store. Unfortunately, most of them sound forward and the music can be aggressive sometime. When I was about to leave, I saw a pair of Dynaudio S1.4. Had the last try and settled on them. Mainly because they are laid-back. I fell like sitting on the 3-4 row rather than the front row. So even aggressive music cannot punch on my face anymore since they are played at a safe distance.
Back to my original statement, I think it is not about bright or dark, but mainly for the sound stage (forward or backward). With a backward sound stage, everything solved on my side. I appreciate other suggestions all the same. Limited by the energy, knowledge and skills, I cannot try them all, even I believe they will all work well somehow.
SO NOW I have Bluesound n130 - Dave - fire - Etude - a pair of white S1.4 (first version).
Enjoying music better than before.
BTW: I did not find many speakers that have a laid-back sound stage, except the S1.4 and special 40. Most of the speakers are forward and punching on your face (or we should call it 3D?). Can I ask for some comments on that, is there any other speakers (say 5 inch) has a laid-back sound stage but good imaging and space?
Thanks all, take care!
best,
T.