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Identical to ER-4 soundtube, from what a gent from Etymotic told me. He said that when the hf2/hf5 was designed, they tried out all the previous sound tube designs and had people in the company vote on what was most comfortable. ER-4 won, so the hf2/hf5 duplicated that design.
And FWIW I have moved one pair of my ER-4 custom sleeves to an hf2, and they fit perfectly. |
























