HD 4.40 BT Sennheiser | Auriculares, 18Ω, 113 (1 kHz/1 Vrms)dB, 100 → 10.000 (micrófono) Hz, 18 → 22.000 Hz, Sennheiser HD 4.40 BT | 136-2919 | RS Components
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Sennheiser HD 4.40 BT Affordable Over-Ear Sealed Bluetooth Headphones Measurements | Stereophile.com
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