Tarun,
I discussed this with our chief engineer, who designed the EP600 and EP500 amplifiers. He says that if you leave the EP500 powered up but reduce the volume to 0 and then gradually increase it--you said the jitter/interference appears at the point the 500 is outputting bass--then the problem is vibration-borne.
Try putting something very heavy (a brick?) on the top of each DVD player to see if that solves the problem. Are the DVD players up-scaling or up-converting? If so, the scaler/converter has to lock on to new sync, and if the video data stream from the DVD has glitches because of mechanical vibration of the DVD laser assembly or the motor/disc-clamping mechanism, then that could cause the intermittent video jitter.
The digital amplifiers in the EP500/600 subwoofers have no inherent RF energy that can interfere with DVD or projector operation, so I'm certain the problem is vibration-borne. Let me know how it turns out.
Regards,
