Ghosts on my HDTV from too much bass?? - AVS Forum
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post #1 of 7 Old 12-02-2012, 06:22 PM - Thread Starter
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I have a 42 inch Sharp LCD that shows white spots on the screen when my subwoofers are a bit loud.
Any fixes for this other than to turn the subs down a bit??

Equip:
Sherwood 5.1 DD 100 watt main amp.
Four parts express BASH 300 watt plate amps.
Four DIY MDF cabinets tuned to 13 hertz each.
Four 12 inch car subwoofers (real cheap cost ten bucks each and will be upgraded to better subs soon).

Thanks for reading this.

Oh video of this problem will be posted in a day or two.

I will have a look to see what model the Sherwood receiver is.

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post #2 of 7 Old 12-02-2012, 07:43 PM
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Are you running all this through the Sherwood? I mean all audio and video. It's probably the receiver causing the probs. I don't believe it's the "bass" that's causing the issue. What receiver is it?

Awaiting video......



dbl

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post #3 of 7 Old 12-02-2012, 08:31 PM - Thread Starter
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Sharp tv volume is set to zero.

The video is going directly to the Sharp via HDMI and the audio is going directly to the receiver via optical with the PS3 reproducing the audio/video.
The Sherwood is a budget receiver that I purchased new at Circuit City in 2006 but it does have optical in for Dolby Digital 5.1
At low receiver volume the HDTV performs ok but when the volume begins to go upwards of 50 then thats when the screen flex on the HDTV begins to be noticeable.

Charging JVC video camera right now.smile.gif

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post #4 of 7 Old 12-04-2012, 06:35 PM
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Just a shot in the dark -

Can you unplug your sub from the wall, or even just turn it off and see if that changes anything. Maybe a ground issue?


The other option is can you get your hands on another receiver from a "buddy" and see if it happens with it?



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post #5 of 7 Old 12-04-2012, 11:42 PM - Thread Starter
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Quote:
Originally Posted by dbldare View Post

Just a shot in the dark -
Can you unplug your sub from the wall, or even just turn it off and see if that changes anything. Maybe a ground issue?
The other option is can you get your hands on another receiver from a "buddy" and see if it happens with it?
dbl

I am going to try these fixes and report back.

I tried with the four subwoofer amps off and no really loud base, no cool boom! effect from explosions and no ghosts.



In the gym video the sound on the subs is not that high but the ghosts are still there but not that problematic but even so the screen flexes a bit.

http://www.youtube.com/watch?v=0-p0SI72Ozg&feature=youtu.be


In the regular music video with a better base sound track the ghosts are very aparent.
http://www.youtube.com/watch?v=bOAGd4yFZYU&feature=plcp


They only happen when I decide to crank!! the receivers volume to over 50 and this in turn boosts the subwoofer output signal that the four subwoofer plate amps get resulting in the four subwoofers createing stronger motion waves until the tv set starts flexing.

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post #6 of 7 Old 12-05-2012, 08:23 AM
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If your screen is flexing then I think it has nothing to do with your electronics at all. It is the screen itself. You'll need to isolate the screen from the vibrations somehow. You can test this by running the LCD on its own without any music and press firmly, but gently on the screen. You should be able to see the effects of a flexing LCD screen. Remember the "L" in LCD stands for liquid.
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post #7 of 7 Old 12-05-2012, 10:08 PM - Thread Starter
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Quote:
Originally Posted by duc135 View Post

If your screen is flexing then I think it has nothing to do with your electronics at all. It is the screen itself. You'll need to isolate the screen from the vibrations somehow. You can test this by running the LCD on its own without any music and press firmly, but gently on the screen. You should be able to see the effects of a flexing LCD screen. Remember the "L" in LCD stands for liquid.

Its a concrete room where walls have zero flex and the only door is four inches thick MDF so isolating the LCD screen is out of the question.
Oh well another point for using an LED projector like the Vivitek Qumi.

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