Overview: The Etymotic Research ER4 MicroPro series of in-ear headphones
utilize balance armature micro-drivers to deliver excellent sound
quality. These reference-quality earphones deliver an unsurpassed 92%+ frequency
response accuracy from 20 Hz to 16 kHz. A Performance Certificate is included
with each pair of headphones to indicate the level of performance. The headphones come with a variety of ear tips for
superb noise isolation, a plug adapter, a clothing clip, wax filters, and a zippered storage
ER4 Model Breakdown: There are two ER4 earphone models. This
pair is the ER4SR which is Etymotic's new Studio Reference earphone. The ER4SR's
channels are matched within 1dB from 100Hz to 10kHz, and deliver a flat response
across all frequencies. The
Extended Response earphone is much like the ER4SR, but offers a slight
performance boost in the lower frequencies.
Balanced-Armature Drivers: The ER4 earphones use high-performance,
precision matched ACCU-Driver balanced-armature micro-drivers to achieve a 98 dB
SPL sensitivity, and an 92%- response accuracy from 20 Hz to 16 kHz.
Noise Isolation: The ER4s have a closed-back design and noise-isolating ear
tips to achieve a 98% reduction (35dB to 42dB) in ambient noise. The 3-flange
silicone ear tips work with most sizes of ear canals to ensure a comfortable fit
and a proper seal. The foam ear tips are heat-sensitive and will expand inside
your ear canals to perfectly form to the contours of your ear to block out
ambient noise. The earphones also come with an option for custom-fit earpieces.
Cable: The ER4 earphones have an attached 60" twisted
cable with a right-angled 3.5mm plug. There is no in-line remote or microphone
on this model. The cable attaches to the ear buds via a modified MMCX connector,
making them removable and replaceable as needed.
ACCU-Filter: The Etymotic earphones are equipped with special ACCU-Filter wax
filter to smooth the frequency response and prevent earwax from entering the
earphones. The filters are placed at the end of the ear bud nozzle, and should
be changed when they become clogged with ear wax. A filter removal tool is
included in the package.
- Frequency Response: 20Hz - 16kHz
- Accuracy Score: 92%+
- Impedance: 45 Ω (at 1 kHz)
- Sensitivity: 98 dB SPL (at 1 kHz / 0.1v)
- Maximum Output: 122 dB
- Noise Isolation: 35-42 dB
- Ear Bud Dimensions: Diameter 0.27" Depth 1.284"
- Weight: 0.7 ounces
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