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What does an amplifier actually do?
What is an amplifier, why do you need one? And what do they even do?
What is a DAC and why do you need one?
What is a Digital to Analog Converter, and why do you need one? And how do they even work?
This DAP does everything! - Astell & Kern SP3000 Review & Measurements
Quite possibly the most refined experience an IEM user could ask for.