Sofa close to rear wall...surround options? - AVS Forum
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post #1 of 17 Old 07-05-2012, 08:22 PM - Thread Starter
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My home theater is utilizing half of my rectangle room.

My sofa is on the narrow wall which is about 10ft. So the main listening position is about 8 feet from the tv.

The sofa is 6 inches from the rear wall.

On the left side of the sofa is a window..about 10 inches away. On the right sisr there is about 7 feet of space...but a doorway right next to the sofas arm rest.
There is no way that I can add speakers such as bookshelves to the left or right of the sofa.

I currently have bipol speakers mounted about 5 foot off the ground right behind the sofas arms.

How can I get the best possible sound from my surround setup considering the physical limitations?
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post #2 of 17 Old 07-06-2012, 09:55 AM
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Surround speaker placement is the least of your worries. Sitting directly in front of a reflecting wall is about the worst place to listen. Do you have no other options?

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post #3 of 17 Old 07-06-2012, 12:19 PM - Thread Starter
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Nope! The space isn't enough space turn the sofa sideways. The sofa is about 8' wide and the room 10 wide. What can I do to help here? This is typical NYC living!
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post #4 of 17 Old 07-06-2012, 04:58 PM
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May be hang the surrounds at an angle from the ceiling pointing to the listening position and put some absorption material like carpet or quilt on the wall behind the couch.
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post #5 of 17 Old 07-06-2012, 06:02 PM - Thread Starter
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I have 4 2" (4x2 foot) acoustic panels made out of mineral wool. They can be placed behind the sofa if needed. Would that help any?

Pictures of the space:

d1a73.jpgp
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post #6 of 17 Old 07-07-2012, 12:19 AM
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Quote:
Originally Posted by Del Cosmos View Post

I have 4 2" (4x2 foot) acoustic panels made out of mineral wool. They can be placed behind the sofa if needed. Would that help any?
Pictures of the space:
d1a73.jpgp

most likely
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post #7 of 17 Old 07-07-2012, 04:05 AM
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Quote:
Originally Posted by Del Cosmos View Post

I have 4 2" (4x2 foot) acoustic panels made out of mineral wool. They can be placed behind the sofa if needed. Would that help any?...
Not with room modes.

Also it looks like you may be using dipoles. If so they require side wall mounting so you are in the null.
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post #8 of 17 Old 07-07-2012, 10:29 AM - Thread Starter
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Thanks - I'll be replacing the bi-pol's this summer which is why I'm trying to figure this all out.
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post #9 of 17 Old 07-07-2012, 07:53 PM - Thread Starter
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Saturday night bump for addl thoughts
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post #10 of 17 Old 07-08-2012, 03:52 AM
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Saturday night bump for addl thoughts

Why think for days and days when it takes so little time and effort to hang the panels, at least in mock-up mode?
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post #11 of 17 Old 07-08-2012, 07:41 AM - Thread Starter
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I've added and removed panels in the past - I'm not concerned with that part (yet). When I do use them I'll be sure to take measurements and see what's going on. I'm wondering if its possible to improve the mounting position or orientation of my surround speakers considering the limitations of this space.
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post #12 of 17 Old 07-09-2012, 01:58 PM
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They are way too high also ... You have to angle them down or change position somehow !
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post #13 of 17 Old 07-09-2012, 08:00 PM - Thread Starter
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Thanks - I'm open to suggestions. The bottom of the rear speakers is 58" high. What height would you recommend?
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post #14 of 17 Old 07-10-2012, 06:13 AM
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Quote:
Originally Posted by Del Cosmos View Post

I've added and removed panels in the past - I'm not concerned with that part (yet). When I do use them I'll be sure to take measurements and see what's going on. I'm wondering if its possible to improve the mounting position or orientation of my surround speakers considering the limitations of this space.

Usually, the first and strongest improvement is obtained by upping the area covered. Until 15-30% of the surfaces in the room are covered, you will make rapid progress.

If the absorbers are in the reverberant field, it almost doesn't matter where they are.

Absorption is usually more effective if spread out and spaced instead of covering contiguous areas.
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post #15 of 17 Old 07-18-2012, 03:35 PM - Thread Starter
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What do you think of mounting the speakers on stands behind the sofa and facing them upward? With either the tweeters facing the front wall or to the sides.
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post #16 of 17 Old 07-18-2012, 03:55 PM
 
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Arny, there is no reverberant soundfield in that room, and simply increasing the coverage area of absorption as a percentage of wall surface is not the solution. That applies only to large acoustical spaces and then only to addressing the reverberant noise floor well beyond the critical distance (of which there is none in a small acoustical space...). What you have in a small acoustical space is localized behavior characterized by modal behavior below about 300 Hz and specular reflections above about 300 Hz.

And employing absorption in that manner om a small room simply results in a fast track to a dead room.

That said, do to his topology without looking at any of the rest of the setup, he might consider broadband absorption on the rear wall and setting mounting surrounds to the sides of the seating area and allowing the surround sources themselves act as the ambiance. (But that said, do to the close proximity to the sources, there is not going to be an adequate response (at least to the rear left) possible.

They would be better off just running the 3 front channels.
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post #17 of 17 Old 07-18-2012, 07:30 PM - Thread Starter
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thanks but I wouldn't run a front sound stage only. I've done it before, and action movies sound flat and lifeless without the surround speakers. The current setup works fine in terms of surround envelopment. Like everyone else on the board Im always looking to improve the setup.
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