Years ago (before NuForce was acquired by Optoma), NuForce used to offer an upgraded linear power supply for the Icon HDP. I havent seen it for a long time, but a number of owners including myself use the TeraDak LPS for the Icon HDP (http://home.teradak.com/products/71.html). I think it may also be referenced in the 6moons review. It’s subjective if course, but I think it gives a more muscular sound, especially with planars, which often demand a lot of current. Finally, if your original switching power supply has failed, this is a no brainer instead of buying a new one from Optoma or fighting with drop to replace it. (In any case I wouldn’t waste time fighting with drop. Over the years Optoma has treated me well when my unit has required repairs due to user-caused damage.)