Etymotic Research ER4SR Noise Isolating Studio Reference In Ear Earphones

Etymotic invented noise-isolating, in-ear earphones. The ER4 MicroPro series earphones were the first earphones commercialized using balanced armature technology and are recognized as the world leader in response accuracy, to which all other earphones are compared. After more than 20 years, these reference-quality earphones are still the choice of serious sound engineers, audiophiles and musicians.

ER4SR is Etymotic’s new reference standard hi-fidelity earphone, for those who demand nothing less than the highest fidelity. The next generation of our long revered flagship earphone, the ER4S, the ER4SR delivers increased accuracy with greater sound output, or sensitivity. Like its predecessor, the ER4SR channels are matched within an industry-leading 1dB across frequencies from 100Hz to 10 kHz. The new ER4SR incorporates significant cosmetic and functional improvements, from a sleek, anodized and laser-etched aluminum body to the reinforced, user-replaceable detachable cable. The ER4SR is a must have for discerning engineers, audiophiles, and consumers wanting the most accurate in-ear earphone available.

Technical Specifications

Frequency Response
20 Hz - 16 kHz
Transducers
High performance, balanced armature micro-drivers
Noise Isolation
35-42 dB
Impedance (@1kHz)
4XR (45 Ohms) 4SR (45 Ohms)
Sensitivity (@1 kHz) SPL at 0.1v
4XR (98 dB) 4SR (98 dB)
Maximum Output (SPL)
122 dB
Cable
5 ft Detachable
User Replaceable ACCU-Filters
Yes
Warranty
2 Years
Custom-Fit Option
Yes