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Once the sub was unplugged, we saw clear picture, etc. Once the sub started to shake the earth beneath us, the screen would begin displaying horizontal lines, until the bass wasn't as prevalent anymore.

I do recall Tarun saying (after my younger brother and I left) that he put his hand on the DVD-player, and that seemed to have gotted rid of the lines.



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The kind of shaking we are seeing is not that of an object moving. Its almost like watching satellite television when a storm is coming...lightning snow noise type stuff.



Sounds to me like a type of grounding issue. If placing your hand on the DVD player stopped the lines, it is not necessariliy that you have isolated the physical vibrations from the DVD player but rather use your body as a ground to eliminate the "static".

This may be a sensitivity of the DVD player that the Xbox does not experience. Have you tried a different circuit? Power conditioner?