To port or not to port speakers

Thank you and good questions. 
Yes and they sound really nice for mini speakers. They are quite heavy actually. I wish 2 of them were the B&W though. I found my listening home with my B&W’s. 
The port is out the rear

You know, I did not know that there was such a setting. I have Denon AVR 1913

I'm glad you made it

do not block the ports.  they will be fine.  

For a  Surround channel / limited signal - the impact of sealing the port is minimal.

Plugged Port results in a higher bass extension ... finding a good material for the plug is of some import ... ' rigid foam ' ... for example.

I am glad for you, my friend (with whom we play games on  this sites ) make something similar, it would be interesting to see the result on the photo)