The Etymotic ER4SR is a reference-tuned in-ear monitor with a single Balanced Armature driver, MMCX connection and a precise, neutral sound character. Its 20 Hz – 16 kHz frequency response, 45 Ohm impedance and 98 dB sensitivity support controlled music listening and professional monitoring.
The CNC-machined anodized aluminum housing provides a stable acoustic foundation for the driver while keeping the design compact and durable. The detachable reinforced twisted cable is practical for long-term use, while the replaceable ACCU-Filters help protect the Balanced Armature driver from debris.
The ER4SR delivers outstanding passive noise isolation: 35 dB with silicone ear tips and up to 42 dB with foam ear tips. Its clean, detailed and balanced presentation makes it suitable for studio checking, travel and demanding everyday listening.
