The Sony's "boosted low end" makes for good synergy with any IEM or headphone that lacks bass--such as Etymotic IEMs. I am very fond of my A728 + ER4P combo.
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Home: Foobar2000 > Alien USB DAC > CIAudio VHP-1 > Audio-Technica ATH-AD700
Portable: Sony NWZ-A728 > Etymotic Research HF5
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