ETYMOTIC ER4S
A single BA driver reference In-ear monitor earphone
The ER-4S earphones are designed to compensate for high-frequency emphasis on all CD recordings for accurate sound reproduction. Performing musicians often use them as in-ear monitors because the sound reproduction of the ER-4S matches that of typical studio monitors. Due to the ER-4S's high accuracy and exceptional sound isolation, these earphones have become popular among musicians, sound engineers, and audiophiles. The ER-4S earphones can be used with a headphone amplifier when using low-powered portable devices.
Independent Category
Etymotic's acoustic research focuses on noise-isolating, in-ear earphones. The ER4 MicroPro series earphones were the first to be marketed with balanced armature technology, globally recognized for their accuracy in sound reproduction and serving as a reference for all other earphones. More than 20 years later, these reference-quality earphones continue to be the most chosen tool by serious sound engineers, audiophiles, and musicians.
Decades of Research and Development Results
The ER • 4S earphones are designed to compensate for the high-frequency range in all CD recordings for accurate sound reproduction. Performing musicians often use them as in-ear monitors because the ER • 4S response matches that of monitor speakers. Due to the ER • 4S's high accuracy and exceptional sound insulation, these earphones have become popular among musicians, sound engineers, and audiophiles. ER • 4S earphones can be used with a headphone amplifier when using low-power portable devices.
For the earphones to have 100% accuracy, the recording of a live performance must produce the exact same sound on the eardrum as the original performance. To achieve this, the acoustic properties of the ear must be considered. The ear's acoustic resonance and horn effect map the audio signal arriving at the open ear (2700 Hz) with high-frequency amplification to match the sound heard on the eardrum during normal hearing.
World Leader in Sound Playback
- Unmatched frequency response accuracy and sound quality - 92% + response accuracy within 20 Hz - 16 kHz frequency
- The only earphone with balanced armature, precisely matched, custom-tuned drivers
- Possesses the highest output sensitivity in its class.
What's in the box?
Main Product
Etymotic ER4s Earphones
Accessories
Detachable, reinforced 1.5m long cable with 3.5 mm gold-plated stereo plug and MMCX connectors and documents
Extra Accessory
Large selection of silicone and foam earplugs, plastic storage case, carrying bag, two sets of spare filters, filter removal tool, ¼” adapter, and shirt clip.
Driver:
1 BA (Balanced Armature)
Cable:
1.5 m MMCX and gold-plated 3.5mm L-plug
