The Tangzu YuXuan Ji is simply one of the finest sounding IEMs in the $50.00 price range in audio. The Bass is tactile, resolving, punchy, and present in sub and mid. Midrange is clear, concise, incisive, and balanced. The treble is extended, incisive, airy, and tonally accurate. The soundstage is quite orbital and spatial cues are above average thanks to the open back design. Imaging and technicalities are also first rate. Maybe the only drawback are the lower mids and vocals can lack some body, but that's such a quibble, since throwing some tubes at it or r2r, and it sings like a bird. Fly bird fly! This IEM has wings! Literally!