Pros: Highly transparent, neutral, well balanced sound, nice build quality and a low price
Cons: Lack of balanced option feels like a missed opportunity since the matching D100 DAC has balanced outs
http://www.head-fi.org/forum/thread/535630/review-yulong-a100-headphone-amp
See above link for my detailed review.
In summary: The A100 is to amps what the D100 is to DACs. Very neutral, accurate, and transparent. It's an excellent value for the price. I docked it a star in the "Design" section because it omits balanced ins/outs, which seems odd given the D100 does balanced.
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