Centre Of Room Null?

[GO-NAD!]

I just finished reading Fotto's HT thread and realized that I might be facing such a dilemma. The couch position will likely be smack dab in the middle of the room and I don't have a lot of flexibility on moving it. I'll have a false wall with an AT screen in front of my front wall speakers.

I just wonder if the stairwell and doorway at the back of the room, as well as the hallway off to the side might lengthen the room acoustically and avoid that centre null? I realize that the hallway might introduce other issues, but I'm not sure anything can be done about that anyway.

Thanks!

 

[highfigh]

I just finished reading Fotto's HT thread and realized that I might be facing such a dilemma. The couch position will likely be smack dab in the middle of the room and I don't have a lot of flexibility on moving it. I'll have a false wall with an AT screen in front of my front wall speakers.

I just wonder if the stairwell and doorway at the back of the room, as well as the hallway off to the side might lengthen the room acoustically and avoid that centre null? I realize that the hallway might introduce other issues, but I'm not sure anything can be done about that anyway.

Thanks!

The end wall door won't do much unless it's open, but it should make a difference WRT the modes at the sofa location.

What's the room height? Will this room have carpet or rugs? Those will help a lot.

Have you seen this site? Look for the Real Traps ModeCalc box and download the calculator. You'll be able to see the frequencies where the modes coincide.
http://www.ethanwiner.com/acoustics.html

 

[fotto]

Looking at your room width, I'm wondering if you want your couch/seating that far from the screen to begin with. How wide of a screen are you planning? Assuming you would have something less than 10' if you plan on some borders on screen sides (let's say something closer to 9' or 108"), if you look at recommended seating distances using following chart (say 1.21W for example, that would put you at just under 11' eyes to screen. Some further consideration on this may make your center/nulls issue less concerning.

 

[j_garcia]

I had a nearly square room in my previous place and even with a high vaulted celing, I still had a serious null because my couch was very near the center of the room. One end of the couch had lousy bass and the other end was fine. Current room allows me to adequately adjust the seating position to accommodate the best bass

 

[GO-NAD!]

The end wall door won't do much unless it's open, but it should make a difference WRT the modes at the sofa location.

What's the room height? Will this room have carpet or rugs? Those will help a lot.

Have you seen this site? Look for the Real Traps ModeCalc box and download the calculator. You'll be able to see the frequencies where the modes coincide.
http://www.ethanwiner.com/acoustics.html

That door is always open. The ceiling is 7'2" (basement). The floor is laminate, but I plan to put a rug between the screen and the couch. I'm hoping that will help.

Thanks for the link.

 

[GO-NAD!]

Looking at your room width, I'm wondering if you want your couch/seating that far from the screen to begin with. How wide of a screen are you planning? Assuming you would have something less than 10' if you plan on some borders on screen sides (let's say something closer to 9' or 108"), if you look at recommended seating distances using following chart (say 1.21W for example, that would put you at just under 11' eyes to screen. Some further consideration on this may make your center/nulls issue less concerning.

I was originally going with 108", but I think it'll be 100" in the end, which will mean moving a bit closer - probably around 11' from the screen. That still puts it quite close to room centre, but I hope the rear wall openings will compensate for that placement.

 

[highfigh]

That door is always open. The ceiling is 7'2" (basement). The floor is laminate, but I plan to put a rug between the screen and the couch. I'm hoping that will help.

Thanks for the link.

I would think about using some sound absorbing panels in the corners an other first reflection areas. I put some in my room and it made a huge difference. Smoothed the bass out immensely and the sweet spot is much larger. I had gotten to the point that I really didn't like the sound much. I have one directly behind my sub and it serves to absorb some of that as well as from the right main speaker.