Sennheiser CX300S Pure Bass Wired Earphone

The Sennheiser CX300S Pure Bass wired earphone in Black - German-engineered closed-back transducer technology delivering detailed sound reproduction and enhanced bass response. 17Hz-21kHz frequency response, 18Ω impedance. Four eartip sizes (XS/S/M/L) for a customised in-ear seal. Single-button smart remote with built-in microphone. Tangle-resistant flat cable with L-shaped 3.5mm connector. Storage pouch included.

The Sennheiser CX300S Pure Bass Wired Earphone brings German audio engineering to an accessible in-ear earphone, applying the closed-back dynamic transducer principles Sennheiser has developed across decades of professional and consumer audio products. The transducer - Sennheiser's term for the driver assembly - uses a precision-wound voice coil, purpose-designed cone and carefully tuned rear acoustic chamber to deliver a frequency response of 17Hz to 21kHz. The low end extends below the threshold of human hearing, capturing the sub-bass energy that communicates physical weight and scale in music. The closed-back design means the rear of the driver is acoustically isolated, preventing rear-wave interference from degrading bass definition. At 18Ω impedance, the CX 300S is fully compatible with the output stages of smartphones, tablets and laptops - no external amplifier required, and sufficient sensitivity for high volume from any standard device. Four eartip sizes - XS, S, M and L - provide the individualised fit that in-ear earphones require: the correct tip creates the acoustic seal on which bass response and passive noise isolation depend. The single-button smart remote handles play/pause and call answer/end across all devices. The flat cable resists tangling. The L-shaped 3.5mm connector sits flush at an angle against the phone when pocketed, reducing strain on the connector. A storage pouch is included. Genuine Sennheiser. 1-year warranty.