Firstly, thanks all for your valuable comments and recommendation.
@akg_ca Accuphase E280 amp , source from Auralic Aries Mini and external DAC with AKM 4499 on Roon platform.
@ryder hi, I just sold my 400xi lately , moving to small room, need a speaker that can produce sound at low volume level while retain the good imaging sound.
Well, I would observe more ... on C7ES3 version then