Speaker placement and soundstage

There is no such thing as "pressuring" the room. Sound waves are a combination of alternating high and low pressure regions.

"Pressurizing" a room usually means enhancing rather than decreasing the effects of room resonances. One needs to decrease the effects of room resonances, not increase them.

The geometry of the room dictates where these resonances are. Placement of furniture, rugs, wall tapestry, fiberglass absorbing "traps" does not change the resonances, those are fixed by the room resonances. All one can do is to decrease the effects of the room resonances, both the peaks and the nulls. Physical traps are very effective, but not the only solution. Proper placement of the traps with respect to the optimized  listening and speaker locations, combined with judicious use of equalization (analog or digital) is the way to create a bass sound that is not boomy, but smooth, treating all frequencies equally.

@toddsyr, thanks for those links. They came in very useful with my speakers. Altec 311/60s on top of LaScala bass bins. Now my horns are dialed in correctly. 

@danmar123 You're welcome but I learned about it right here on Audiogon. The method makes a nice difference for sure and it's free! Once placement has been done then you do the room treatment.  It then gets even better. 

I've been working with GIK for the last week to finalize my room treatments, but I'm not going to extend myself until after the summer. My bass bins are 9.5' on center with a brick fireplace in between, on a 13' wide room. We came up with 7 panels just in the front end & 2 in the rear wall.

My room is really tricky. Even a door in the corner of the back wall. I ordered a total of 13 panels and bass traps. Some panels are for the ceiling.  Not all have arrived yet. They are produced on demand so be prepared for it to take a couple months for everything to arrive.