|   video-shielding | bubby
Apr 23, 2001 11:09 AM | | my center channel, when played at loud volumes, gives a bit of distortion to the tv screen. any ideas on how i could prevent this? the speaker is video shielded, i looked at it. and it works fine at low to medium volumes...thanks.. |
| re: video-shielding | jefflam79
Apr 23, 2001 12:06 PM | | Video shielding doesn't work that way, or it shouldn't at least. your system doesn't have to be running for an unshielded speaker to cause video distortion. The speaker doesn't even have to be connected to anything. Try taking off the center and puting it far away from the tv and play it loud again. If it still happens, then you have other problems like interference from something else. What happens to the TV exactly? |
| re: video-shielding | bubby
Apr 23, 2001 12:31 PM | | i believe it to be the speaker. the tv only does it when really loud, driven tones come from the center channel. when the speaker is moved away, it deceases. the tv distortion is shaky lines that go across the screen, sorta flickering the picture. and it only does it, again, when the center is really pushing hard. |
| re: video-shielding | jefflam79
Apr 23, 2001 2:12 PM | | Very strange. I do not think it is due to shielding. If the speaker was not properly shielded you would see discoloration on the screen, not shaky lines. You may be experiencing the same thing that happens to many screens when you turn on a vaccum in the same room and the screen turns fuzzy with static. You know what I mean? Do you have a power conditioner? |
| re: video-shielding | bubby
Apr 23, 2001 2:29 PM | | mo frere, it is indeed the shielding. when watching super speedway (imax film on indie cars), the engine sounds coming from the center channel create very noticeable flickering lines in the top 1/3 of the screen. they are horizontal, and seem to be focuses more on the same side as the mid 5 1/4" driver is, as opposed to the tweet, which makes sense. As the speaker gets more driven, the magnet works harder, and the flicker becomes more dramatic. it really only does this at pretty high volumes, and only on certain scenes where alot of midrange is coming from the center channel.
i'm wondering if taking out the mid driver and treating it somehow would fix it..maybe one of those lead-lined camera film bags for airport travel? |
| From your desc... I'd say it's not magntic shielding related. | Markw*
Apr 23, 2001 2:24 PM | | If it was, the distortion would be constant, regardless of level.
It sounds like the speaker is PHYSICALLY transmitting mechanical vibrations into the set thereby causing something loose inside to cause the problem. |
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