HIFIMAN HE-R9 Dynamic Closed-Back Over-Ear Headphones with Topology Diaphragm, Wired/Wireless, W/WO Bluemini R2R (Wired)

Headphone Specifications: Frequency Response: 15Hz-35kHz Impedance: 60Ω Sensitivity: 100dB Weight: 328g Bluemini R2R Specifications (come with wireless version or user separate purchase): Bluetooth version: Bluetooth 5.0 Bluetooth chipset: Qualcomm QCC5124 DAC: HIFIMAN HIMALAYA Frequency response: 20Hz - 20kHz Signal-to-noise ratio: 114dB Battery life: 8 hours Net weight: 25g Transmission codecs: LDAC, aptX-HD, aptX, AAC, SBC

• Best-sounding Dynamic Drivers: High sensitivity thanks to HIFIMAN’s use of a rare earth magnet; Advanced voice coil; Topology diaphragm for detailed high frequency response to 35kHz. The “Topology Diaphragm” refers to the diaphragm with a special Nano particle coating applied to its surface. By carefully controlling the diaphragm surface structure you can yield different results in acoustic performance to a degree previously unobtainable.
• Bluemini R2R (User Separate Purchase or Come with HE-R9 Wireless Version): R2R Structured Bluetooth DAC and Amplifier; Small but Mighty: HYMALAYA MODULE, HIFIMAN Custom Created DAC; Ultra-small, highly efficient energy consumption, exceptional high-resolution wireless audio.
• Elegance Outside, Strength Inside: The exterior of the headband is covered by high-quality leather, giving it a soft and elegant appearance. Inside, there is high-grade memory foam, selected to achieve the most comfortable fit and elasticity. The headband skeleton itself is made of solid steel. The structure is both lightweight and strong, robust yet delicate, and designed to convey detail and musicality that is unmatched in the market.
• Large Ear Cups for Superior Acoustics: The crimson red ear cups are large, with internal space that helps produce substantial special volume and the necessary breathing room for the powerful driver to sound its best.
• Cable Connections - Dual Compatibility Mode: The socket can accommodate both dual-sided unbalanced 3.5mm cable and a single-sided 3.5mm balanced cable (left socket). Bluemini R2R dongle (separate purchase) easily connects to the left socket.