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| Specification | Details |
| Product Brand | Aoshida (In collaboration with LetShuoer) |
| Product Model | E20 |
| Headphone Type | In-Ear Monitors (IEMs) |
| Acoustic Design | Semi-Open Back (CNC-machined anodized aluminum faceplate) |
| Driver Configuration | Dual Dynamic Drivers (10mm Beryllium-Coated Driver + 8mm DLC Diaphragm) |
| Frequency Response Range | 20Hz - 40kHz |
| Impedance | 12Ω ±1% @1kHz |
| Sensitivity | 98dB/mW @1kHz |
| Total Harmonic Distortion (THD) | Less than 1% @1kHz |
| Chamber Construction | High-Precision 3D Printed Medical-Resin Shell |
| Cable Material | 4-Strand, 216-Core (0.05mm) High-Purity Imported Copper Wire |
| Cable Length | 1.25 Meters |
| Earphone Connector Interface | 0.78mm 2-Pin Detachable Dual Pin Slots |
| Audio Plug Termination | 3.5mm Single-Ended Line Type Straight Plug |
| Housing Materials | 6063 Anodized Aluminum Back Cover & High-Strength Resin |
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