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I did move the sub to two locations and two different outlets.

Its got to be those DVD players....



Note to self: Don't buy a HKDVD47.

Perhaps you can run an extension cord to your neighbor's house

Can you find some thin foam rubber or packing foam to place your DVD on top of to partially isolate it from the vibration? I won't rule out a loose solder connection from a hot transistor that could be vibrated to cause the lines but you will have to make sure it is completely isolated; perhaps even running cables to an adjacent room.