"My Favorite IEM Under $500"
Balanced tuning with a touch of warmth, and every instrument has its own clean space. The verdict: beyond its price class.
Yu9 · Que · Hybrid in-ear monitor
1 dynamic driver plus 3 balanced armatures with a precise four-way crossover. A self-developed 10mm dual-magnet dynamic driver handles the bass, tuned Knowles balanced armatures handle the mids and highs. The 3D-printed resin shell and wave-pattern metal faceplate take three to four times longer to make than comparable products.
Silver 4.4mm is in stock. The 3.5mm plug and the black color are made to order and ship about 10 to 15 business days after ordering; after payment we will confirm the lead time with you by email.
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Balanced tuning with a touch of warmth, and every instrument has its own clean space. The verdict: beyond its price class.
Layering and a clean background are the strengths; fit and sensitivity to ear tips are honestly named as weaknesses.
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Ranks Que in the top three of its price range and finds little to fault in its tonal balance.

A self-developed 10mm dual-magnet dynamic driver delivers bass quantity and extension. Two Knowles mid-range balanced armatures, each with a modified rear chamber, complement each other in tone with lower resonance. A nozzle-less high-frequency armature sits behind a large-bore horn to suppress resonance and reduce roll-off.

A precise four-way crossover for the low, low-mid, upper-mid and super-high bands works with a physical notch filter and low-impedance crossover components, keeping every band in its place without interference for a flatter response and rich detail. Technology once reserved for flagships, brought down to this price.

A neutral reference base with moderate bass. Soft, refined mids without the harsh metallic edge; excellent treble extension without obvious peaks; a clean, pitch-black background with excellent imaging and separation, and an open, speaker-like sense of space.

A complex 3D-printed resin shell with a wave-pattern metal faceplate. Production takes three to four times longer than comparable products, all for precision in every acoustic structure. This is not a product of efficiency but of obsession.

In the box: cable, carrying pouch, cable clip, standard silicone ear tips, liquid silicone ear tips, cleaning cloth and a numbered cube. Orders shipped outside Taiwan carry a 12-month warranty: you ship the unit to us in Taiwan and we pay the return shipping.
| Drivers | 1 dynamic plus 3 balanced armature hybrid per side |
|---|---|
| Crossover | Precise four-way crossover with physical notch filter and low-impedance components |
| Impedance | 9Ω @ 1kHz |
| Sensitivity | 126dB/Vrms @ 1kHz |
| Frequency response | 20Hz to 50kHz |
| Connector | 0.78mm 2-pin, detachable |
| Plug | 4.4mm balanced (3.5mm made to order) |
| Stock cable | 6N single-crystal copper |
| Color | Silver (black made to order) |
| In the box | Cable, carrying pouch, cable clip, standard silicone ear tips, liquid silicone ear tips, cleaning cloth, numbered cube |
Specifications may change without notice.







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