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cyclebrain
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Is it real or just my imagination?

I have not been much of a TV watcher in the past, but recently bought a large flat screen TV and got HD satellite service. After spending a bit of time watching and not listening, I started listening to the stereo again. It didn't sound right to me so I got out the pink noise generator and the spec A and checked the response. A bit off, so I corrected. Still doesn't sound right.
Is it my imagination or does the large flat screen create a new front surface reflection that combines with the rear wall?

Jan Vigne
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Re: Is it real or just my imagination?

Probably, though it shouldn't matter unless your speakers are firing into the TV. With a front facing monopole speaker you're talking no less than second or third reflection off the TV. That should be considerably down in level unless you are listening in a shoe box. The TV's front panel is how far away from the wall it sits on? That distance would give you how much deviance from the wall's reflection?

Toss a blanket over the TV and give a listen.

Elk
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Re: Is it real or just my imagination?

Large large flat screen TVs definitely screw up the sound.

Nasty, big reflective surfaces.

cyclebrain
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Re: Is it real or just my imagination?


Quote:
Toss a blanket over the TV and give a listen.

Excellent idea. Simple and rational thought.
A little annoyed that I didn't think of it, but big enough to be open to good ideas.

Editor
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Re: Is it real or just my imagination?


Quote:
With a front facing monopole speaker you're talking no less than second or third reflection off the TV. That should be considerably down in level unless you are listening in a shoe box.

All conventional speakers with front-firing drive-units become omnidirectional below 300-400Hz or so. So while the reflections from the TV screen will be down in HF, they will not be negligible and will lead to comb-filtering. This will not be amenable to correction with equalization.


Quote:
Toss a blanket over the TV and give a listen.

Good suggestion. If you have a friend handy, get him to move the TV back and forward while you listen to pink noise. If there are reflections from the screen, you will hear the combing move up and done in frequency as he does so,

John Atkinson
Editor, Stereophile

boper39
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Re: Is it real or just my imagination?

If your 2 channel and flat screen are on the same AC line, you should try unplugging the tv and see if that makes a difference. GG

cyclebrain
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Re: Is it real or just my imagination?


Quote:
If your 2 channel and flat screen are on the same AC line, you should try unplugging the tv and see if that makes a difference. GG

While I realize that your post is sarcastic (I hope), it does remind me of a time were I was using a pink noise generator and a spectrum analyzer to measure my room and had a large spike at one frequency (I don't remember what it was). Adjusting my EQ had no effect on it. Turning off the TV even though the sound was off cured it. I was measuring the TV's sync frequency. I couldn't hear it at all but the analyzer could.

Turboschpeck
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Re: Is it real or just my imagination?

Robert Harley wrote that anything in between the loudspeakers reduces stereo depth. Confirmed from my experience also. And probably alters frequency response somewhat.

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