Is there a way to remedy a problem with main entry doorway when the doors are located next to each other?  I know communicating with neighbors can help some but sometimes it is inevitable that the door may slam louder sometimes.   I sometimes think the designers did not think the layout well.

I see lot of apartments that has same problem.  

Is there an HOA or property manager at the complex? If so, ask if an adjustment can be made to the door so it doesn't engage loudly. It can be as simple a solution as:

"Grab one or two felt pads and stick them inside the door frame. You can put them around the lock area, or spread them out closer to the top and bottom. The pads will catch the door before it hits the frame. While it won't completely silence the slam, it will quiet it, providing you some protection from the sound."

I've done this before and it helped more than I thought it would.  Hope it may work for you too.

Hmm, didn't think about putting felt pads on the frame.  That could help, I was originally thinking using the little rubber pads that sells everywhere first.  I talked to my apt management they know the issue and are brainstorming on it too.  Since I am not going to be the only case with door slam dolby surround effect.

thanks for the tip.