The 4306 has an ipod input (my family has 5 of them) and enet interface. In reviewing the forums, some say the 4306 midrange sounds better. Also, the surrounds have better imaging.
I compaired a 4306 to a Yamy 2700 and found the 4306 to have better highs and movie surround to be better (more real). They did not have a 3806 to compare it to. Thanks for the input.