Marcus Downey from Headfonics reviewed Erco with integrated ES9028PRO DAC and balanced 6.1W capable headphone amplifier.
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Quick summery by Headfonics: The Ferrum ERCO DAC is neutral to natural, accurate, and articulate. Its amplifier has bags of power to drive just about any headphone you want to throw at it. It is also incredibly simple to operate right out of the box.