“You have to open a door or window to let the pressure out of the room.”

Now salt lake city has an open air concert stadium . So where do the waves go? It has recently been discovered that the brine shrimp in the great salt lake have increased since styx played there. I won't mention the band that decreased the population. I turned serius on the love channel now I have too many cats.retrospective prospective double blind non bias study just got accepted for publication funded by peta. Enjoy the music waves. Do we port speaker boxes and why? Is it an open door? 😃

Of course it makes perfect sense that it would change the sound, especially in the bass.  Kind of makes me think of bass reflex cabinet vs a sealed cabinet.  

What sounds better is up to you and the details.

@signaforce Glad to hear that!  I was curious a while back and got the REW software and a mic, and in addition, acquired some technical books to help me better understand concepts like decay, sound wave dynamics and resulting things like room nodes, etc.  I've had a lot of fun listening to, and then testing with the software, things like opening/closing blinds/drapes, doors, moving furniture and of course speaker placement.  Most all of it makes a measurable difference with the software.  Not all of Iit made differences I could notice with my own ears, however.  Or if I did, maybe not always positive differences.  But opening the rear doors to my room (which creates a 7-8 foot "hole" in the back or my room) makes an incredible difference, especially in the bass.  And importantly, I understand why that is given my measurements and study.  Good luck!

So if you add up the square footage of the walls, ceiling and floor, what difference would a window ( @9-12 square feet ) make? Maybe the advice was just to remove an entire wall? 😳

I have a custom listening room that is nearly airtight. I understand the post, and when manufacturers with bigger speakers have been setting them up in my room, they often run them at very high levels with the door shut. It can get uncomfortable on the ears. 

I used to listen with the door shut exclusively, but the past year or two I have taken to opening the door. It just seems to be a bit different experience, even though I am not trying to pressurize the room greatly.