iPod - etymotics ER6 and ER4

in iPod + iTunes + AppleTV edited January 2014
Can anyone do a side by side conparison of the Etymotics ER-6 and ER-4.... the ER-6s are half the price.... is there that much difference. What are their good/bad points..... grateful for advice (I am interested but not sure about taking the plunge (currently using the similar sony in the ear buds MDR-EX70 ....white version).


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