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Dealing with a large TV between speakers

Thought I'd post this since it's a glaring problem (somewhat literally, very figuratively). I've got a 50" rear projection LCD TV between my speakers that has to be there for many reasons (HT/living room/etc). Soundstaging on the x and y planes seems OK, perhaps a little narrow, but forget about the Z plane. All the action seems to take place horizontally between speakers, with vocals perhaps a bit projected forward.

I've done the Master Set method on my speakers. They are ~3ft from the rear wall and about 7.5' apart (measured from drivers) . The TV is about 20" out from the rear wall and 4.5' wide. There is roughly 18" between the speakers and the sides of the TV.

For a better visual, I've created a drawing here that I've used for submission to various acoustic panel websites.

As you can see, speakers and TV are along the long wall, and I only have about 12' total between that wall and the wall behind me. I can't move the speakers out too much more, and based on Master Set and the rule of thirds, they seem to be where they should and they do sound good there (no bass bloat, clear imaging, etc). There is roughly 2' of space between the rear wall and my head.

What I've done so far for treatment are the acoustic and diffusion panels you see in the picture, and I've wrapped thick round foam pipe insulation (the tubes you can buy at Home Depot) vertically along the sides of the TV, which seems to help. I've also experimented with hanging a diffusion panel or light foam panels over the front of the TV to cover the front. However, I'm not noticing much of a difference with the front of the TV treated or not, surprisingly (I assumed that there would be more glare and smearing with such a large, untreated, reflective surface between the speakers and directly in front of me).

Outside of throwing a blanket over the TV (which I tried, didn't really work) do you see any way to accomplish more depth to the soundstage? Questions and comments welcome, but keep in mind, I can't move the TV.
tholt
peter_s
1,313 posts
 
Tholt - take your TV out temporarily and see if it is indeed the problem. Thus we can stop speculation on that!

Are you sure the absorbers are good behind your speakers? In my room, I preferred diffusors, but I was using Quads then. I would say, never assume that treatments are for the best - play with them some.

That said - I like your diffusors too. I build my own Skyline diffusors out of balsa wood. Can you share more about them, parts, construction, etc?

Thanks, Peter

PS - I have friends with a similar layout to yours. They are using GMA Europas and getting very good soundstage along the long wall with heads near the rear wall on a sofa. It must be possible.
bryoncunningham
890 posts
 
Since you cannot move your setup to a short wall, here are two more things to consider:

1. Maybe you would have better luck with diffusion behind the listening position, rather than absorption, as indicated in your overhead plan. I have a friend who listens close to the rear wall, and the addition of diffusion behind his listening position improved his soundstage significantly. Since you already have diffusors in the room, you can easily experiment with them on the rear wall.

2. I just noticed that you have a vaulted ceiling. I once had a listening room with a vaulted ceiling, and it resulted in lots of undesirable effects, some of them unpredictable. I was able to minimize these effects by hanging absorptive baffles like these. Whether it would improve your soundstage, I cannot say, but it should improve things generally.
buconero117
2,311 posts
 
Before doing anything you need to get the center channel's drivers in the same plane as the side speakers drivers. The way it is now creates all kinds of problems when the center is active.
tholt OP
545 posts
 
Hi Buconero - center channel is for movies only. Music is strictly 2 channel.
nikturner920
144 posts
 
I get great soundstaging with my speakers on the long wall and my listing position near the rear wall. Almost as good as shortwall placement in my room but with much better bass response. My room is well treated though.

I think the comments about removing the TV are good. You need to figure out what each piece of room set up contributes to the sound. It is possible that with the TV completely removed doesn't make that much of a difference.

Do you have the speaker cable length to try the speakers way out into the room? Just to see if you can get any depth. There are some set up that just don't do depth well.

It takes a long time and effort to get a handle on room acoustics.

Seriously, you should write up some plans for those diffusors I would love to build a set. Really non recording studio look.
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