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ER•6
The ER6 is articulate and a well-balanced performer.
The ER•6 Isolator earphones were designed as a low-cost alternative
to the ER•4 series earphones. The ER•6s use a smaller, 2-flange
eartip and a thinner, lighter-weight cord. Their compact size and weightlessness
make
them ideal for travel and personal listening.
Plugs directly into:
- Most airline audio systems
- CD, DVD, MP3 and MiniDisc players
- Laptop computers
For Travel and Personal Listening
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Noise isolation (15-35 dB) far surpasses that of active noise-canceling earphones
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Airline travel -- plugs directly into most airline audio systems
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CD, DVD, MP3 and MiniDisc players
- Laptop computers
- In-ear monitoring and mixing
- Can be used with custom Musicians Earplugs
System Includes
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ER•6 Isolator earphones
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5 ft. cord with 3.5 mm stereo plug
- 1 pair 2-flange eartips
- 1 pair foam eartips
- 2 replacement filters
- Filter changing tool
- Shirt clip
- Zippered pouch
ER•6 shown with Musicians Earplug.
ER6-15 Earmold Adapter (below) required.
ER•6 Response Accuracy
Product Comparison
Response Accuracy in Percent
ER•4 Earphones
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ER•6 Earphones
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| Earbud |
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| Active Noise-Canceling |
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| Active Noise-Canceling |
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How We Measure Response Accuracy
The accuracy score is perhaps the single most important tool for earphone design.
A perfect recording of a live performance played through earphones with 100% accuracy would produce the same sound at the eardrum as the live performance. A complicating factor is that the acoustic resonance and horn effects of the ear change a flat signal entering the open ear to an eardrum signal with the approximate frequency characteristic of the target curve. A perfect earphone will create that same frequency characteristic at the eardrum.
Target Curves
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Target curves on Etymotic Research graphs indicate 100% accuracy: The open ear diffuse-field response of the KEMARŪ manikin modified to compensate for the high frequency boost added to high-quality recordings. This modification (approximately 5 dB at 10 kHz) is necessary to avoid earphones sounding too bright on commercial recordings. Commercial recordings have a high-frequency boost that compensates for the high frequency roll-off in studio monitor loudspeakers and high-quality stereo loudspeakers and earphones.
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Earphone response was measured on a KEMARŪ manikin that has the same acoustic properties as the average head and ear. 25-band accuracy scores are calculated by summing the difference between the earphone response and the target response in each 1.3 -octave band from 50 Hz to 12.5 kHz.
In the 1970s, Consumers Union used an "Accuracy Score" to rate loudspeakers. Consumer Reports reported that it was possible to predict listeners' loudspeaker ratings within 8% from a calculation based on one-third-octave frequency response measurements converted to loudness in sones. The average error in loudness from a perfect system, subtracted from 100%, gives the accuracy score. Etymotic Research extended this 21-band calculation to a 25-band calculation and routinely uses the 25-band accuracy score in all earphone designs.
Other in-the-ear earphone manufacturers do not report accuracy scores, but Etymotic Research has tested all competitive products. The accuracy scores of Etymotic Research earphones are higher than those of most loudspeakers, and well above all competitive earphones, except electrostatic headphones that cost thousands of dollars.
ER•6 Noise Reduction
- 3-flange eartips: 35 dB external
noise isolation (NRR = 22dB)
- Black foam eartips: 41 dB external
noise isolation (NRR = 32dB)
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