Dear all Sanyo Z1 owners ! (1) Do anyone of you know what is the use of the "magnetic ring" over the Sanyo Z1's power cord come with the projector ? If I need to change to a "DIY longer" power cord, do I still need to re-attach this magnetic ring as well (but I am not sure whether that ring can be easily removed from the old power cord or not ???) (2) On the other hand, do anyone of you have used your Sanyo Z1 with a power conditioner/surge protector ??? Will it really improve the picture quality of the Z1 ? I owed a Furutech 168 power filter/surge protector, and used for my DVD Player, CD Player, Surround Amp, and Tube Amp; but still not yet used for the projector --- because the distance between the two are too far away. Looking forward for any advice / opinion on the above questions & thanks in advance !!!