@phusis, Thank you.
@mijostyn, I get it now. I am convinced that is the way to go and seems not a costly and difficult thing to do. So correct me if I were wrong. I will go buy a miniDSP 2x4 HD (assuming HD version is better) and miniDSP 2x4 HD1 plug-in and make the following connection to integrate the main speakers with the SW:
source -> DAC/preamp -> MiniDSP HD -> main speakers/SW
I am not sure how good is the DAC inside the miniDSP so I feed the digital source to my DAC first and let the miniDSP process the analogue signal before distributing to main/SW, right? On the active SW side, I will by-pass the Xover (or set it to the highest frequency). Anything else I should pay due attention to please let me know.