[DISCONTINUED] Etymotic ER4XR-BT Earphones with Bluetooth Cable

Over 30 years ago, Etymotic invented noise-isolating, in-ear earphones. Etymotic’s original design, developed for auditory research and hearing testing, used balanced–armature receivers and established these speakers as the true reference standard for high-definition, in-ear earphones. Paired with the new Etymotion Wireless Bluetooth cable these earphones are unstoppable and sound better than anything else on the market today. With built in functionality to answer calls, play/pause, and change tracks it’s the ultimate in audiophile portability.

Etymotic ER4XR-BT Features

• Single driver in-ear monitor
• Anodized aluminum shell
• Class-leading passive isolation
• 35-42 dB attenuation

• ER4XR-BT Earphones with Bluetooth Cable1
• Detachable, 5 ft. cable with 3.5mm gold plated stereo plug1
• Dual flange silicone eartip pair: S1
• Dual flange silicone eartip pair: M1
• Dual flange silicone eartip pair: L1
• Dual flange silicone eartip pair: XL1
• Triple flange eartip pair: standard1
• Triple flange eartip pair: large1
• Foam eartip pair: standard2
• Filter removal tool1
• Replacement filter1
• Shirt clip1
• Zippered storage case1
• Channel-Matching Compliance certificate1
• Two Year Warranty1

• Frequency Response 20 Hz – 16 kHz
• Transducers Single high-performance balanced armature per channel.
• Noise Isolation 35dB using silicone ear tips, 42dB using foam ear tips
• Impedance 45 Ohms @ 1kHz
• Sensitivity 98 dB @ 1kHz, 1mW
• Maximum Output (SPL) 122 dB
• Cable Detachable reinforced, twisted 5 ft with MMCX connectors
• User Replaceable ACCU-Filters Yes
• Custom-Fit Option Yes