The Duke CIEM is the world's first and only Micro-dynamic CIM, and obviously, we would need your impression to make them, even though we do have universial fit version, we still think Custom is the way to go with this one.
If you are interested, talk to us for more details
Product Name: DUKE
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Type: In-Ear
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Impedance: 16 Ohms
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Headphone sensitivity: 120db(Universial )/ 121db(Custom )
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Frequency range: 12-22000 Hz