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How good is a $4000 music player? - Astell & Kern SP4000 review
The SP4000 is the latest flagship device from manufacturer Astell & Kern, delivering not only exceptional performance but some highly desirable software features that start to make this device look strangely reasonable in price.
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.
