HIFIMAN has released its first new desktop amplifier/DAC in ten years, the EF400. It is versatile and sounds very good with many kinds of headphones and devices with USB output.
Woo Audio, based in New York, builds a few power amplifiers, but lots of headphone amplifiers. In the current review, we take a look at the WA7d tubed headphone amplifier, with DAC, and solid state power supply.
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