I ask because my Realtek onboard audio can downmix (by selecting 5.1 setup in settings, and then turning off the center and rear speakers in that setup). My Fiio E10 can't downmix as far as I know.

I got it in an unsealed aluminum container with no usb cable (not sure if I was even supposed to get one, but I have an aftermarket one so it didn't matter much) and I also didn't get the rubber feet pads. Didn't think much of it but when I plugged it into my PC and my HD558s into the E10, no...

Do those USB audio jacks cause a decrease in sound quality? Does it matter which one I buy, or should I just get the cheapest one?

It's a white noise/static usually near the beginning and end of songs and fades out because the sound of the music overshadows it. I haven't changed my source at all though (the only thing it's connected to is my desktop computer, with integrated audio). Is it possible it's picking up some...

http://www.amazon.com/Philips-DCM250-Docking-Entertainment-System/dp/B0028Y4H1O/ref=sr_1_13?s=electronics&ie=UTF8&qid=1325296304&sr=1-13   Does it act as any sort of DAC or is it just one of those "jack-of all trades but master of none" audio devices? I have no use for a radio or a cd player...

I already have the IEM (RE0's) and player (Nano 4th gen), but I still need help on what else is required of a "rig". I know an amp is one of the components, but I've heard that RE0 doesn't really need to be amped. Also I need help on what an LOD cable actually does and if I need one if I decide...

I try to take good care of them, but it seems as if that wasn't enough, haha.   You know how each earbud is basically made up of two halves? Well my left side split up, and somehow the wires inside came apart too.   Now, I'm pretty sure this can be fixed, but at what cost? I'm guessing...