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[Stars' Review] https://starspickeraudio.net/blogs/blog/hifiman-he-r9

Hifiman HE-R9 Wireless Bluetooth LDAC aptX HD Closed-back Dynamic Topology Diaphragm Headphones Bluemini R2R Module

Best-sounding Dynamic Drivers
- High sensitivity thanks to HIFIMAN's use of a rare earth magnet
- Topology diaphragm for detailed high frequency response to 35kHz
- Advanced voice coil

HIFIMAN Topology Diaphragm
The "Topology Diaphragm" refers to a diaphragm featuring a special Nano particle coating applied to its surface. The result is a more natural and detailed sound than what is typically achieved in True Wireless earphones.

The idea behind the new Topology Diaphragm was inspired by Dr. Fang Bian's Ph.D. thesis that "different Nano materials have differing structures and each of those materials have its own properties". Therefore, by carefully controlling the diaphragm surface structure you can yield different results in acoustic performance to a degree previously unobtainable.

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 an 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 its necessary breathing room for the powerful driver to sound its best.

Cable Connections - Dual Compatibility Mode
The socket can accommodate both dual-side 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
- Dual 3.5mm TRS cable
- Single 3.5mm TRRS cable

HE-R9 (Headphone Specifications)

Frequency Response: 15Hz - 35kHz
Impedance: 32ohm
Sensitivity: 100dB
Weight: 328g
Connector: 3.5mm balanced socket on the left

Bluemini R2R Specifications
Bluetooth version: BT 5.0
Bluetooth chipset: Qualcomm QCC5124
DAC: Hifiman HIMALAYA
Frequency response: 20Hz to 20kHz
SNR ratio: 114dB
Battery Life: 8 hours
Net weight: 25g
Transmission codecs: LDAC, aptX-HD, aptX, AAC, SBC