I started this thread a few months ago. Since then I have been trying different cables and 3 other car radios so probably there is nothing you can do with the hiss on the N800I have recently bought a N810, mainly because of the sunlight readable screen and 'pocket-friendliness' and to my big surprise there is no hiss. Well, there is some but only audible if I really crank up the volume in my car radio. I strongly recommend getting the N810 to those who listen to music in the car.

My N810 was bought in England whereas my N800 was bought in America but probably it doesn't matter, or does it?