I have a sectional couch in my home theater room. A friend of mine came over earlier today and said that those kinds of couches distort sound patterns. Is that true?
What causes problems are large solid surfaces, which act as reflectors. They're especially bad if they're between the listeners and the sound source.
That's interesting. Does that mean that coffee tables are generally a bad idea? If the speaker is above the large solid surface, would a table still be considered in between the speaker and the listener?
Wayne Parham Messages: 18793 Registered: January 2001
Illuminati (33rd Degree)
That's right. One of our most common and useful pieces of furniture is problematic: The coffee table.
There are a few things you can do to mitigate the anomalies it creates:
1. Place it to the side of the listening area instead of right directly between the speakers and the listeners. A couple of end tables beside the listeners is better acoustically than a coffee table in front of the listeners.
2. When a coffee table in front of the listeners is desired, use one that is as small as possible. Limit the flat (reflective) surface area.
3. Place books and other things on it to diffuse and "soften" the reflection.
Directional speakers can also be used to reduce the problem, but the truth is that most speakers (even directional ones) lack control in the vertical.
It's crazy how common coffee tables are despite how problematic they can be. Thank you for the tips. I could definitely make do with a couple of end tables instead of my coffee table, and I have enough books around my house to help soften things up a bit. How big is too big for an end table? Or does that not really matter so long as they aren't directly between the speakers and the listener?
Wayne Parham Messages: 18793 Registered: January 2001
Illuminati (33rd Degree)
End tables beside the listeners don't reflect nearly as much to the listeners as a coffee table placed in front of them.
It's pretty easy to visualize the effect if you think of the incident of reflection and picture how much glare you'd have if the table were a mirror and the speakers were spotlights.
Picture that for a minute. Imagine that each main speaker was a bright light and that the coffee table had a mirror laying flat, face-up on the table's surface.
What you would see when facing the speakers (lights) was the coffee table (mirror) would be almost as bright as the mains (lights).
Just like the mirror creates a glaring reflection that's nearly as bright as the mains, the sound reflection from the coffee table is also very strong.
So you effectively have another sound source coming from the coffee table, and it is slightly delayed because the path from the speakers to the table to your ears is slightly longer than the direct path. The delay is actually the problem - The interaction causes comb filtering which adversely affects sound quality.
You know, I've asked myself many times why I even have a coffee table. It's pretty much just a glorified footrest, at least in my place. It's not all that big, but considering that it has nothing on it, it probably hasn't been doing me any favor sound-wise. I guess it's time to get rid of it. Would a bookshelf below a speaker cause issues?
You know, I've asked myself many times why I even have a coffee table. It's pretty much just a glorified footrest, at least in my place. It's not all that big, but considering that it has nothing on it, it probably hasn't been doing me any favor sound-wise. I guess it's time to get rid of it. Would a bookshelf below a speaker cause issues?
That's pretty much what my coffee table serves as too. I'm assuming that you're talking about having a mounted speaker above a bookshelf. Is that what you meant? If it is, how far does your bookshelf stick out? I'm not sure if it would matter, but you never know!
What about a room where the sofa is behind a wall and the TV is mounted on the opposite wall? I have a friend whose apartment is set up this way. The sound is not comfortable to listen to, is that because of the walls?
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