if you plan to use phone or ipod. i would want to know first of all that how would you get Dolby out of analog rca cable ?? either you have a digital output which is not possible out of the 3.5 RCA jack as its analog
else you have 3 cables running 2 channels each to have proper dolby.
we do get 5.1 headphones running 3 wires for proper surround but they will work only with 5.1 or higher PC based sound cards..
either way you are looking at 15k+ headphones.
if you talking about virtual surround then its not dolby its just hollow sound processing trying to make the imaging bigger and wider to give that effect which is software based and you will get the same effect in either of the IEM's or headphones...